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35mm A/S carb?
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Posted by: troybilt

Where can you get one of these? I checked ESR website, no go. Any ideas?

Posted by: troybilt

Never mind, guess you got to look under the Banshee stuff!

Is the 35mm AS carb a good XC setup? Would you prefer a 36mm?

Thanks,
Troy

Posted by: Honda 250r 001

I hear that the 35 is hard to tune. Do they make a 36 airstryker? if they do i would suggest that with the little knowledge that i have.

Posted by: All250R

quote:
Originally posted by Honda 250r 001
I hear that the 35 is hard to tune. Do they make a 36 airstryker? if they do i would suggest that with the little knowledge that i have.

Keihin Makes a PWK 35 and 36 quad vent. I can't remember if the 36 is an airstriker, but i want to say the intake fins are missing. It's been a while since I've seen one though. I imagine the 36 would be xlnt for XC, and work the type of power you want with porting and pipe. The 34 isn't a bad carb either if it's in good condition, but if you're going to get a different one, you may as well go more than 1 mm bigger, otherwise just use the 34 and tune the engine.

Posted by: troybilt

Here's the deal. My motor is basically stock, 0.010" over bore fresh top end. I'm going to go with a type 6 pipe or TRX7, leaning towards the type 6, boyesen rad valve. That's about it. Its an 89 so has the heavier flywheel. I want to build a great running, reliable little woods bike that I can fool around on. I've got other bikes that are built for dunes and MX. I also want to be able to lug it around in the tight technical sections. We have alot of woods/rocky trails around here to ride so this is going to be a bike built specifically for this terrain. Heavy skids, etc... build from frame up. I hear the 88/89 porting is good for XC already so wasn't planning on touching the porting. Any other suggestions? I've got 2 34 mm carbs, so I could just stick with one of those.

What gearing do you run for xc? 14, 13, 12 counter, 38,39 rear sprocket? Can you get a heavier flywheel than the 89?

THanks, Troy

Posted by: dynofox

I've got 35mm A.S. carbs on both my '86 ATC 250r and '86 TRX 250r. I'm very pleased with them for xc / trail riding. Both carbs now have 152 mains and 42 pilots. The ATC is using the DEK needle on the 2nd clip and the TRX has the stock needle from the 34mm pj on the 3rd clip.

TRX mods: FMF fatty pipe, FMF Q silencer, air box has drilled holes in the lid with a pre-filter over them, UNI filter, boyesen rad valve, low / mid ported cylinder, '00 CR 250 ignition, 12/39 gearing and soon to come a cool head with 21cc dome and '85 ATC head gasket.

Posted by: 1promodfan

quote:
Originally posted by All250R
Keihin Makes a PWK 35 and 36 quad vent. I can't remember if the 36 is an airstriker, but i want to say the intake fins are missing. It's been a while since I've seen one though. I imagine the 36 would be xlnt for XC, and work the type of power you want with porting and pipe.

I had a 36 quadvent that I just sold. It didn't have the intake fins. I'm not sure if its still considered an Airstryker or not. I had it on my 310 and it worked great.

[QUOTE]Originally posted by troybilt
Here's the deal. My motor is basically stock, 0.010" over bore fresh top end. I'm going to go with a type 6 pipe or TRX7, leaning towards the type 6, boyesen rad valve. That's about it. Its an 89 so has the heavier flywheel. I want to build a great running, reliable little woods bike that I can fool around on. I've got other bikes that are built for dunes and MX. I also want to be able to lug it around in the tight technical sections. [QUOTE]

I think from my experience that I had with my 36 carb, you'd be pleased with it. I think it'll work great with your setup. It had great throttle response, and it seemed to work great in all RPM ranges. The only reason I changed is I got a good deal on a 38 A/S. It takes a little bit to get it dialed in, but once you do its just as smooth as butter.

Posted by: MossboysRacing

I race XC and my old motor was very similar to yours. I ran a 34pj that was bored to 36mm and it ran great. Had a 42 pilot and a 158 main. I still have it and the cylinder i ran it on for sale. I switched to a 310 and a 38A/S. I know a lot of people run a heavier flywheel so you can lug it in the tight stuff, but i run a Ricky stator lightened flywheel. i perfer the faster reving over the lugging. I personally run 12/39 gearing on 20" razr 2's

Posted by: troybilt

Where do you get a heavier flywheel? I guess I'm not that educated in this XC stuff. I've been more into drag racing and we went with lightened flywheels...

Posted by: dynofox

quote:
Originally posted by troybilt
Where do you get a heavier flywheel? I guess I'm not that educated in this XC stuff. I've been more into drag racing and we went with lightened flywheels...

I suggest trying your stock flywheel before adding weight. The stock flywheel can be lugged pretty well. I've got a '00 cr 250 ignition in my R and the flywheel is 1/3 of the size the stock trx unit is, I personally like the quick revs of the lighter flywheel. Our trails are pretty tight, a lot of 1-3 gear riding and I've never had any issues with it stalling.

Posted by: troybilt

Thanks. I heard the 88/89 flywheel was heavier than the 86/87...? I also saw on a thread someone was running a 14 tooth counter sprocket for woods?? What gearing do most run?

Posted by: Honda 250r 001

quote:
Originally posted by troybilt
Thanks. I heard the 88/89 flywheel was heavier than the 86/87...? I also saw on a thread someone was running a 14 tooth counter sprocket for woods?? What gearing do most run?

85 atc flywheels were lighter than the 86-89 trx flywheels. All will interchange so you can mess around with the weight if you want. the 85 atc flywheleel was only 5 grams lighter i believe.

Posted by: troybilt

Thanks. I was actually interested in a flywheel that is heavier than the 89's... does anyone make one? or are they custom? I could get one weighted and turned. but would rather buy one already done. Just curious...

Posted by: Honda 250r 001

quote:
Originally posted by troybilt
Thanks. I was actually interested in a flywheel that is heavier than the 89's... does anyone make one? or are they custom? I could get one weighted and turned. but would rather buy one already done. Just curious...

you have to have a weight welded on the original flywheel. Ive seen one before you also have to run a 3/4 inch spacer plate under the stator cover or the flywheel will hit. I think the ignition i saw was a curtis sparks? Good luck finding one though.