Jetting Help Asap!

[Hockey390]

I have an 87 shee, had stock pipes on it.. I'm puting on new carbs (stock jets) with twist throttle and FMF fatties (old style) with matching silencers. I was told that I need to jet this to 270 with the clip 4th from blunt end. I cant get ahold of the guy to ask him if 280's will work. Oh, i also have a K&N filter on there with regular airbox with removed snorkle if that matters. But the carbs I bought came with the dual K&N's...Which is better (i do trail and dune) the single K&N or duals???

 

Please answer ASAP!!

 

Thanks

[spoin39]

I would keep the box if you ride trails, the 280 is a good starting point, do a plug check to see if needs to go up higher after you ride. Make sure you are 3-4th gear wide open and kill the engine, then check. You want a nice even tan-light brown.

[BenBB]

I agree with spoin39, keep the single K&N in the airbox. But if you can I would remove the lid (assuming the filter will stay in place without the lid, and you don't hit ALOT of mud & water), and start richer on the mains; like 320 (assuming you're close to sea level, 60-80 degrees F and 32:1 premix). If you keep the lid, I'd start with 300 mains...you might wind up at 280's but I like to start rich and work my way down. 270 mains would prolly be lean with your K&N unless you were at a REAL high elevation or high temps. Good luck.

[Hockey390]

Im at sea level, and as of right now...its cold as hell.... about 1 or 2 degrees out. But I wont be riding it much this winter...more of a fixing up period

[fixitrod]

Yeah, I noticed you are in michigan. The colder it is the richer you need to run. It's 1 jet size per 15deg if you jet perfect to the t. I usually jet a little rich anyway so I don't have to mess with it all the time.