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280 jets?


Yamashee1

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Ok I have a few Mods on my shee. The list is as follows: Boynsen Dualstage Reeds,T.O.R.S Removed with Idle screws,Toomey 2 Into 1 Airfilter(no airbox), RocketPipes. Im at 670Ft above seaLevel. Im Running 280 Main jets. It seems to be Running Fine It's Kinda hard to Start the first time.But when it Warms up it screams and the Throttle Responce is great. Do I need to move up to 300 or Bigger Jets?

I was told on here that 280 seemed to be a little to Lean. What do you guys think?

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When I demo'd the Rockets, I had no air box, twin K&N Pod filters, shaved flywheel, +4 timing advance and my mains were 370s.

Mains won't help you start...what size pilots do you have in there? I'd say you need 27.5s for sure.

 

You read my other thread on how to dial in your pilots by idle RPMs...

 

If you get the best idle with less than .5 turns out, you need smaller pilots (stock 25 is the smallest), more than 2.0 turns out...bump up a size...

 

280s sound lean based on my experience, similar mods, similar temps and elevation. However, plug chop doesn't lie...

 

You didn't mention anything about porting, so...I'm going to assum it's a stock ported motor...

 

Try this to properly do a plug chop...and if you end up with 280 mains and plugs looking good...well, that's all there is to it.

 

http://www.dfn.com/benkaren/plugchop.html

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When I demo'd the Rockets, I had no air box, twin K&N Pod filters, shaved flywheel, +4 timing advance and my mains were 370s.

Mains won't help you start...what size pilots do you have in there? I'd say you need 27.5s for sure.

 

You read my other thread on how to dial in your pilots by idle RPMs...

 

If you get the best idle with less than .5 turns out, you need smaller pilots (stock 25 is the smallest), more than 2.0 turns out...bump up a size...

 

280s sound lean based on my experience, similar mods, similar temps and elevation. However, plug chop doesn't lie...

 

You didn't mention anything about porting, so...I'm going to assum it's a stock ported motor...

 

Try this to properly do a plug chop...and if you end up with 280 mains and plugs looking good...well, that's all there is to it.

 

http://www.dfn.com/benkaren/plugchop.html

Yea it's all stock port, with stock Pilots, my air screws are 2.5 turns out.

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