Full exhaust. Question about jet kit. - Kawasaki Ninja 250R Forum
 
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post #1 of 7 (permalink) Old 06-13-2012, 12:43 PM Thread Starter
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Full exhaust. Question about jet kit.

I installed my full jardine GP-1 with headers today but I ran out if time to do the dyno jet kit. I also installed k&n air filter and removed the snorkel. Will it hurt the motorcycle to ride on it until I can do the jet kit? Or should i wait?? Help please

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post #2 of 7 (permalink) Old 06-14-2012, 05:16 PM
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i just heard that your bike will run too lean and migh cause problems
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Originally Posted by ddavis5010 View Post
I installed my full jardine GP-1 with headers today but I ran out if time to do the dyno jet kit. I also installed k&n air filter and removed the snorkel. Will it hurt the motorcycle to ride on it until I can do the jet kit? Or should i wait?? Help please

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yeah its a 250 so what....you have a mountain bike with a 50cc motor straped to it!!!
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post #3 of 7 (permalink) Old 06-14-2012, 06:11 PM Thread Starter
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Thanks man yea I'm gonna wait to get it all finished

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post #4 of 7 (permalink) Old 06-15-2012, 09:10 AM
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You may not need to re-jet. Put the snorkel back in and see how it runs. You may be surprised. Those who race the Ninja 250 are reporting HP and performance gains with equivalent to stock main jets, snorkel in and full exhaust. If the bike does not perform well, consider adjusting the needles (shimming).

" Carbureted powersports vehicle manufacturers do not jet their carburetors perfectly, for two reasons. First, there are emissions considerations, mostly affecting the idle and midrange carburetor circuits. Consequently these circuits are jetted leaner than normal, and should be richened slightly for better performance. However, this rarely requires more than an adjustment to the idle mixture screw, and in some cases an adjusted slide needle height. Second, manufacturers ship their product to many different places across the globe. They purposely jet too rich on the main jet, the carburetor circuit that presents the most liability in terms of engine overheating. Therefore, all road-going powersports vehicles are jetted "fat" on the main jet. Contrary to what many people believe, but true nonetheless. Manufacturers do this because they cannot jet individually for each market, so they simply err on the rich side rather than the lean side, because the latter would present more problems. The fact is, engines are much more forgiving of a 3% rich condition than an equal lean condition, and just as importantly, few customers will notice a rich main jet, while nearly all will complain about a lean one." excerpt from Pipe Jetting
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post #5 of 7 (permalink) Old 06-15-2012, 10:31 AM Thread Starter
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I put the snorkel back in this morning and wow what a difference I can actually ride it! Thanks guys

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post #6 of 7 (permalink) Old 11-11-2012, 10:55 AM
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i have the same issue, my bike us backfiring like a monster. Its crazy. i removed the snorkel and im gonna have to rejet. anybody have any good tips?
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post #7 of 7 (permalink) Old 12-24-2012, 06:16 PM
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If you plan on riding it after intake and/or exhaust mods without doing a re-jet, you should at least put new plugs in and check them to see how it's burning. Doing these mods without jetting makes it run leaner, which, as stated above, might not be a bad thing, but performance will increase in an overly-lean mix as opposed to an overly-rich state. It'll feel awesome, but could be harmful to the motor if it's too lean. Hopefully you won't have to do anything!
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