re-jet after boring waverunner?

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pinboy122

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Feb 9, 2006
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northern ill
hey all, im having trouble getting any good info on my waverunner650.i just bored it .060 over and dont know if i need to re-jet.if i leave the stock jet will it run leaner or richer?my brain is confused please help!
 

If you're worried turn the high speed screw out 1/2 a turn and do a plug chop. I doubt .060 will make much difference in terms of jetting especially since Yami waverunners are VERY safe right from the factory.
 
yeah, like dok said... no reason to change jetting. I bored my superjet .50 this past spring and didn't change a thing.
 
On a 650 it won't be necessary to change jets...if you want to be safe give the highspeed adjustment an 1/8th or 1/4 turn out. It's not nearly as sensitive as a sled AND it's jetted WAY safer.
 
DoktorC said:
On a 650 it won't be necessary to change jets...if you want to be safe give the highspeed adjustment an 1/8th or 1/4 turn out. It's not nearly as sensitive as a sled AND it's jetted WAY safer.
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I didt see it was a only a 650

I had a Yamaha GP 1200 R

Imagine boring that sucker .060
 
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