someone point me in the right direction

[Presidentlincoln]

I'm 1000 ft above sea level, bored .050 over pro x piston, toomey t5s, vf3, cool head with 21 cc domes, chariot cross over intake, +4 timing no air box lid. what I have now is a 25 pilot and the main is 340 that seems huge just looking for some input thanks

 

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[RIPPIN' IT UP]

What porting?

 

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[Larry's Shee]

Most pipes like at least a 27.5p

Did you do this jetting?

That big of a main jet could be masking an air leak.

[trickedcarbine]

I'm 1000 ft above sea level, bored .050 over pro x piston, toomey t5s, vf3, cool head with 21 cc domes, chariot cross over intake, +4 timing no air box lid. what I have now is a 25 pilot and the main is 340 that seems huge just looking for some input thanks

 

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27.5 pilot

Middle clip on needle (fine tune after)

280-290 main

[Presidentlincoln]

it's not ported that's the next investment and no I didn't that's how it came and the person that had it before me might not know as much as he thought he did about working on shit

 

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[Strm Trpr]

27.5 pilot

Middle clip on needle (fine tune after)

280-290 main

If the OP's motor is air tight, the above jetting will be very, very close.

OP, inspect the intake boots for cracks.

Re-torque all reed cage and intake screws.

250in•lbs or 20ft•lbs

Seat both airscrews gently and turn them out 1/2 a turn at time until they're 1-1/2 turns out.

 

But all of the above needs to happen first, then the following needs to happen.

 

Is TORS eliminated?

Is your idle set to ~1,500 rpms?

Are your carbs sync'd at idle with a FAST Sync tool?

Are your carbs sync'd at part throttle?

[Presidentlincoln]

yea tors has been eliminated and no on the rest of that stuff I just built my motor and haven't even gotten it in the bike yet

 

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[Strm Trpr]

If you're serious about your engine and tuning, build or buy a leak down tester and a digital tach from eBay.

http://m.ebay.com/itm/Yamaha-Banshee-Two-Stroke-2-Stroke-Leak-Down-Tester-/291786994849?nav=SEARCH

http://m.ebay.com/itm/New-Digital-Tach-Hour-Meter-Tachometer-Gauge-For-2-Stroke-4-stroke-Gas-Engines-/331223584733?nav=SEARCH

 

Buy a FAST Sync tool too.

http://farmandsandtoys.com/ocart2/carburetor-sync-tool.html?search=Sync

[Presidentlincoln]

ok I'll build a leak down tester tomorrow seems easy enough bought a tach and I'll get that other tool eventually too thanks

 

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