[DS90X Mods] - ATV Riders Forums - Honda, Yamaha, Suzuki, Kawasaki, Polaris, CanAm, Arctic Cat, Kymco ATVs

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DS90X Mods
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Posted by: tmfracing

What upgrades have you made to your DS90X?

I removed the sparky but it actually seems to have less power with it out.

Also, does anyone know anything about a grey wire on the CDI box that can be cut to increae HP? If so, please describe where this wire can be located.

Thanks in advance.

Posted by: kris32775

Hey that grey wire is located under the right fender it is a bullet style connecter you need small hands to access it. double check that. i read that on another forum. we are going to try it out this weekend.

Posted by: 9sec.Bird

How much are the DS90x's ?

Any idea How do they compare to the DRX90's ?

Posted by: RTJ

I LOOKED AT ONE YESTERDAY IN CLAKSVILLE, TN $3349. LIST

Posted by: tmfracing

I paid $3,300 OTD for my son's.

Regarding how it compares to the DRX90. I would expect that the DRX90 would have much more power stock to stock. Of course, that is due to the DRX90 being a 2-stroke machine and the DS90X is a 4-stroke.

I choose the DS90X because it is a 4-stroke. I do not want to be told when my son and I can take rides together. I live in San Diego where the weather is typically right around 70' degrees year around.

There are rules around here that limit 2-strokes to ride 3 months out of the year.

I personally think that the DRX90's are a nice quad and may have looked at one if they had a 4-stroke option.

Everyone has different needs and want's and ultimately that's what's going to determine what will fit you best.

Posted by: tmfracing

I spoke to Justin today at Maximum RPM he is still about a month out on a complete exhaust system for the DS90X. He also will have a CDI box, Air Filter Kit, Cluth Mod's, Jetting Kit and Big Bore Kit's for this quad.

He advised me that the DS90X in stock form puts out 3.5 h.p. @ the rear wheels. When he added his new exhaust and cdi it puts out 7.0 h.p. @ the rear wheels. That's a 100% increase in power. If you are looking for more torque you can gain 2.5-3lb's of torque by adding his clutch mod's.

He is confident that he can build this unit up to compete with any highly modded Honda TRX90.

The bottom line is that with a little bit of work this quad can become very competitive.

That's good news!

Posted by: RAWDAWG635

Hetrick is working on performance parts for the ds90 too.

Posted by: tmfracing

I am pretty sure that Justin @ Maximum RPM is making the hop up parts for the DS90X and Hetrick is reselling them.

Posted by: Jaybird

I have my nephews in the barn, He has been riding with my son on the little track in the pasture. I think a clutch mod would do wonders, It snaps off the line decent but takes forever to build speed. Is there a spacer in there that keeps the sheaves from closing all the way? It is also slow to rev. A pipe and carb upgrade should help that. I may try the Mikuni 22 I pulled from my sons Typhoon. Also, the shifter is right in the way, it is just held on with set screws so I may try to find a knob about the size of a golf ball and chop the lever down. And for some reason the rebound is VERY slow. You can pick the quad up and it takes about 2 seconds for the tires to droop all the way down. It seems to be sprung about right but way over damped. It does seem well built though and can probably be upgraded into a nice strong runner for relatively cheap.
Brian

Posted by: Z400Pilot

quote:
Originally posted by kris32775
Hey that grey wire is located under the right fender it is a bullet style connecter you need small hands to access it. double check that. i read that on another forum. we are going to try it out this weekend.

Did you try disconnecting the gray wire? Where did you read about it?

Thanks

Posted by: kris32775

Yes we did I don't think it made that much if any difference. I read that on another forum. some people said it made a huge diff some said not at all.give it a try and let me know what you think. thanks kris

Posted by: Z400Pilot

Kris,
I just took my son out on the DS90X for the first time yesterday. It will be a little while before he (or me for him) is ready for more speed. When we do get to that point I will try it (gray wire) and I will post my observations.

Posted by: kris32775

just wondering if anyone looked at putting on a rear foot brake, i'm thinking a 400ex brake pedal and master cylinder might work. let me know if you have any ideas. Talked to max rpm the otherday and he has the clutches ready.I'm going to get a preproduction exhaust around the first or second week in march, then the cdi. I'll let you know how they are. They said it should almost double the horse power at the rear wheels.also is anyone running the d6 ultimate series this year? we were going to just do atco but every thing is still up in the air i guess, hope to see some of they same people at the series.

Posted by: kris32775

Just got off the phone with justin at max. rpm. He is shipping us the exhaust and cdi on thursday, should be in pa by monday. I'll let you know how it is and post some pics. 1st race on march 16th at sleepyhollow. we'll see how it stacks up.

Posted by: etondaddy

That will be a great test for it for sure they'll be some fast d5 kids there. I should be a blast. Kyle we'll be on his e-ton but in the shifter class.......... he's Honda's not going to be done and we don't want to lose the points in the PAMX series. See ya there.

I met and was talking to Justin at the Indy show and he was real excited about the pipe, cdi, and clutches for the Cam-Am

Mike Kozura

Posted by: kris32775

WOW. just installed the pipe and cdi. huge difference. really wakes the bike up. not to loud, but a nice tone. guess i,m going to get the clutches to, probally after the elkas come in. i'll post pics tomorrow. see you at sleepy on sunday.

Posted by: musky

We finally got all of Rieys parts on over the last week. The rear clutch, cdi, & ehaust. The new parts made a big difference. Now we are wating for a carb. upgrade & new airbox. There are more pictures on http://www.bakmotorsports.net/Home_Page.html

Posted by: musky

I forgot to attach the picture of the new exhaust.

Posted by: etondaddy

Hey Musky looks good......... me and Kevin have known each other for about five years now and have build minis together for those five years he's a good guy and he'll take care of you.

Mike Kozura

Posted by: mxdad423

Thanks for the kind words Ron and Mike, I am always happy to help out as much as I can. Yea Mike it's hard to believe it's been that long already, I know one thing, in that amout of time we have built alot of quads and spent ALOT OF MONEY, LOL....
Hey Ron, have you picked out all your new Kasea parts yet?

LOL....
Did you get to do any adjusting to the clutches today? If so how did it go? Did you find any combo that you like a little better. Give me a call tommorrow and we can talk a little more about the sprockets.
Don't forget to get me some pics of Riley and I will get them up....

Thanks again,
Kevin Smitley

Posted by: dcarter

hey all, dave here!
I have the can am 90 in the shop, justin brought it to me and i am working on long travel a-arms and swing arms for it know. may be in 2to3 weeks we will have a few things for it. also we will be doing a round house swing arm as well. we will post pics as we get parts done for the mini. thanks dave

Posted by: etondaddy

quote:
Originally posted by dcarter
hey all, dave here!
I have the can am 90 in the shop, justin brought it to me and i am working on long travel a-arms and swing arms for it know. may be in 2to3 weeks we will have a few things for it. also we will be doing a round house swing arm as well. we will post pics as we get parts done for the mini. thanks dave

You Can-Am boys are set now Super Dave's on it........... get prepared to be amazed

Mike Kozura

Posted by: musky

quote:
Originally posted by etondaddy
You Can-Am boys are set now Super Dave's on it........... get prepared to be amazed

Mike Kozura

Thats what Kevin has told me. I ran a couple of things past Kevin for Dave to look at. The only problem is my wife says if I keep talkn to you guys that I'm going to have to get a second job or move into Kevins garage.

Posted by: dcarter

i have a 16X20 out building beside my house you can move into if you need to. dave

Posted by: etondaddy

quote:
Originally posted by dcarter
i have a 16X20 out building beside my house you can move into if you need to. dave

There you go..... Kevin's shed's pretty small I'd go with Dave's building. Your one of us now...... life is all about quad racing..... I hope your as lucky as me and your wife gets into it.. it makes life so much easier.

Mike Kozura

Posted by: STOCKRACING917

quote:
Originally posted by etondaddy
There you go..... Kevin's shed's pretty small I'd go with Dave's building. Your one of us now...... life is all about quad racing..... I hope your as lucky as me and your wife gets into it.. it makes life so much easier.

Mike Kozura

LOL@mike....your wife reads the forum, don't she?
....suck up...hehe

Posted by: etondaddy

Yes sir my lips are right up against her dupa........

LOL..... and yes she reads this all the time

Mike Kozura

Posted by: tmfracing

For those of you who have purchased either the exhaust, cdi or the clutch kit is it worth the extra money? I was thinking about buying all of the above from Maximum RPM. Will the $800.00 of upgrades make a big difference in the bikes performance? I was speaking with someone from Hetrick's and they were saying that the biggest problem with this bikes performance is in the design of the head.

My boy is not looking to race. He just likes to ride fast out on the trails/desert.

Thanks,

Posted by: musky

We have all 3 on our sons quad. We put the the exhaust & cdi on at the same time so I really cant tell what part made a bigger difference. I'm guessing that it would be the exhaust. The way the old one was routed was pretty screwed up. We installed the clutches a few days later. At 1st I wasnt to impressed but my son & I dialed them in Sat. & he said it was a whole lot better. I hope this helps. tmfracing I sent u a pm

Posted by: kris32775

We also have the exhaust and cdi, I opted to buy a rear shock (elka) before i bought the clutches. trying to use the money were i think he will need it most. We will be getting the clutch though.The exhaust and cdi made a big difference, granted the bike still needs allot more power. We were at sleepyhollow today and he finished 3rd over all but the bike is slow. only good thing is it didn't break like some other bikes. will be calling both heitrick and max. rpm on monday to what is ready. good luck and see you at evansville. d6 round 2. Oh did anyone find that the bike is running lean after installing the pipe. I think we have to go up a size in jet. or if anyone has any suggestions that would be great. thanks kris

Posted by: FISH ON!

Go for the upgrades. We installed the pipe, CDI and rear clutch all at the same time. The combo made a big difference on the track. If you get the pipe, don't make the effort to try and get the original one off in one piece. I tried and ended up cutting it in three pieces anyway and wasted a couple hours. Does anyone have any advise on the adjustable clutch? We have the Koso and we went with two of the three weights and two ticks on the scale adjustment. My son is about 70 lbs. We haven't played with the adjustments yet since I don't have a good tool to break it down. Once I make one we should be able to try some adjustments at the track. We're still hunting more power and would like to get a new rear shock. My son likes to get air and we are having some issues with the rear shock. The front seems to work great. Justin at MaxRPM said the carb was a little high on the jets from the factory and it should be fine with the mods and he was right. The plug looked great and it runs smooth. May need to increase the size when we get more air through the intake.

Has anybody found a good filter to replace the factory one? The original filter is falling apart. We're trying to keep the factory box in tact for GNCC rules. We also can't seem to keep the factory rear fender support brackets from breaking. Any good ideas out there on that?

Go X-Team !

Posted by: musky

Congradulations on your sons good finish, not bad at all for a new quad. We have been lucky our plugs have looked really good after 4 or so hours on the new exhaust. We switched over to the iridium plugs, not sure if that makes a difference. I heard there were 2 90x's dynoed & 1 didnt need rejetted & 1 did. If you get the clutches play around with them, make a huge holeshot gain. We are going to mess around with some smaller rear sprockets, seems like it's geared awful high with the larger kenda tires.
Good Luck
Ron

Posted by: kris32775

Thank you. My son was Happy too. Thank god he understands that it's going to take awhile to get the bike were it needs to be. If the plug is a whitish color that means it's to lean correct. should i move the clip down a position or wait till we can get a new main jet. also my buddy said if i remove the air box lid or drill holes in it that it wood fatten it up a little. That sounds backwards to me. Is that true?

Posted by: mxdad423

The carb is a Kehin Carb so you should have no problem finding main jets if you are a little lean, but if you want to try to do it with the needle you will need to move the clip down on the needle wich will raise the needle (Richer).
On the air box, if you are running lean now and you do an air box mod (Drilling holes) that will give it more air wich will make it even leaner, you can do this mod but will have to richin it up even more. Hope that helps you out. If you have any other questions let me know and I will help you out to the best of my knowledge.

Kevin Smitley
B.A.K. Motorsports

Posted by: mxdad423

Hey Musky, I got your Fax, I just tried to call you, sorry I missed your calls earlier I was tied up all day today with Brandon's quad. I put his new engine togeather today and was tuning it in, the dredful jetting process. I will be available for a while yet tonight if you want to give me a call, I left a voicemail on your phone just a little while ago.

Thanks,
Kevin Smitley

Posted by: musky

Yeah white means lean. Go to the articles section on atv riders there are some good pics on reading plugs. Were you able to find out the main jet size? I called a couple of dealers & they could tell me anything, I was planning on having to change the jet. I'm with you if you drill holes in the airbox that will lean it out even more.

Posted by: kris32775

Thanks guys I told my buddy he was nuts when he said that about the airbox. he is probally a little sleep deprived , he has a new born at home. I'll excuse him for now.Does anyone know the stock main jet size? thanks again.

Posted by: tmfracing

Thank You to everyone who posted feedback regarding the upgrades that I mentioned above. I have decided to bite the bullet and purchase the exhaust, cdi, koso delta adjustable clutch, koso posi grip clutch housing, rear clutch spring & a new 32 tooth aluminum rear sprocket.

Posted by: Lopez

Does anyone have a link or the phone number to MAX RPM? If I am going to only buy 1 mod....what would you suggest I get? I am looking for most bang for the buck. My son is 8 and only been on his new quad a few times (he has been riding from age 3), now he is asking to make it faster. Any impute would be great.

Posted by: mxdad423

Check your PM's.....

Kevin Smitley

Posted by: kris32775

I was looking to find out about the motor on the 90x and it's made by aeon, they also make quads, they have a 125cc overland and it has a cvt transmission. with reverse. sounds like the same motor. any thoughts? Also has any one done a speed test with there gps? The owners manual says unrestricted speed of 30 mph, bull. we have the cdi and pipe and were only getting 24 mph tops. let me know what you guys think. will be calling justin in monday to see if his big bore kit is ready. if not we might be selling. I hate to say it but i'm getting frustrated with this turd. sorry i feel better know.

Posted by: tmfracing

I understand your frustration. You appear to be involved in the racing scene more then we are right now. It appears that 4-stroke 90's run against 2-stroke 90's. If that's the case the 4-stroke's will need huge $$$$ just to be competitive. If I were buying a quad for my son to race I would have opted for either the DRR or the APEX. Their dominating the race season.

When I was shopping for a quad, I was looking for a fun safe low maintenance quad for my 6yr old son to ride in Glamis and out on the trails. As mentioned in a previous post, I live in San Diego CA and the rules are real strict regarding 2-stroke ATV's.

How does the DS90x compare to other stock 90cc 4-stroke's? I would hope it can at least keep up with other stock 4-stroke's. If it cannot then maybe DS90X owners should start a campaign against Can-Am to address this problem.

If their manual states that the ATV's unrestricted speed is 30 m.p.h. should they be held liable if their quad does not reach that speed?

Posted by: jjd223

Here's the Aeon motor with a little help, This is from a Polaris Outlaw 90 which uses the same Aeon motor.

http://i230.photobucket.com/albums/ee153/jjd223/MVC-147F.jpg

Posted by: kris32775

Thanks for the response guys. It will keep up with other 4 strokes. I was fully aware of the performanc between 2 and 4 stroke,and the money involved. I guess i like to be different. my thought was they can make a trx 90 really quick. why can't i do that to this bike. I know we will loss a little power with the cvt but i should be close. we'll get there but i get impatient some times. I did find a power loss tonight. after this weekend of racing i pulled the plug, looked brand new. problem... we hooked it up to a sniffer at our dealer and it's running about 30 % to lean. i'll call justin and get jets. that should give me a little bit more i hope. The motor in the pic i see a difference in the intake that thing is 3 times the size as whats on our bike. what will the outlaw run stock? I wonder how polaris as there motors built? thanks again guys really appreciate all the help.

Posted by: azextreme

You guys need to measure the cyl height & the head stud spacing! I'm sure you can find cyl & and race heads but you need the measure (in mm)!

Posted by: tmfracing

According to Hetrick they can make this bike run with a TRX90 motor. It will cost you roughly $3,500.00. They say it's about the same cost as building a TRX 90. It comes down to personal preference shifter or cvt.

Posted by: azextreme

So that mean there is cly and head out there! What is the stock stroke of this bike??

Posted by: tmfracing

Here are some details:

Engine: 89.5cc 4-Stroke, single, force air cooled, 2 valve

Bore: 49.5

Stroke: 48mm