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Jetting on Yoshi Pipe
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Posted by: Shuee_400

I just like to know what people jetting people are running with the Yoshi pipe.. Thanks

Posted by: shaff107

He also has a K&N air filter. What is everyone one running in theirs??

Posted by: shaff107

LTZ400 Full System Exhaust:

2175157, 2175500

Jetting for Stock Airbox with no modifications:
Mikuni main jet #122.5

Jetting with airbox snorkel cover removed:
Mikuni main jet #145.0

Jetting with airbox lid & snorkel cover removed:
Mikuni main jet #150.0

http://www.yoshimura-rd.com/corrections.asp

Posted by: TRFOXX

I just have the Yoshi slip on and i use the stock main jet with no airbox mods and the spark plug looks great!

Posted by: BlueZ440

150..remove air lid and snorkel.

Posted by: nemesis

Do you have to change anything other than the main jet?

Posted by: Crazy Diamond

What are the stock size jets?

Posted by: GooseZ400

Yosh slip on stock jetting, uni air filter, no air box mods and it still eats ex's for breakfast.
Go with what Yosh says they have they dyno sheets there to. Plug looks great and it hauls

Posted by: GooseZ400

2003-2004 main was a 125. Yoshi calss for a 125.
2005 and up is a 130 not much bigger but you know you'll be on the safe side

Posted by: Crazy Diamond

Goose--I just installed a Yoshi RS-3 Full Exhaust on my 2003. Yoshi calls for a 122.5 Main with no mods to airbox. I just took it for a ride and checked the plug and its white. If I have a 125 in there now what should I go to? A 122.5 like they call for will be leaner and the 125 is lean now. Also what about needle position?

Posted by: GooseZ400

if you had a 125 in it that should have done in.
try a 130 and a 135. stock needle if i remember right only has one position.
If it is lean i'd try the 130 next rev and hold er to max and chk the plug then

Posted by: Crazy Diamond

OK! I have a 135 in it now! Seems good. Plugs good. Now I'm hitting the Rev Quick. Which Rev Limiter should I go with? I'm also cutting the box and trying a 140 and 145 after that but need input on a Rev Box!