Presidentlincoln Posted June 18, 2016 Report Share Posted June 18, 2016 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 Sent from my SM-G920V using Tapatalk Quote Link to comment Share on other sites More sharing options...
RIPPIN' IT UP Posted June 18, 2016 Report Share Posted June 18, 2016 What porting? Sent from my Z6 using Tapatalk Quote Link to comment Share on other sites More sharing options...
Larry's Shee Posted June 18, 2016 Report Share Posted June 18, 2016 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. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted June 18, 2016 Report Share Posted June 18, 2016 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 Sent from my SM-G920V using Tapatalk 27.5 pilotMiddle clip on needle (fine tune after) 280-290 main 1 Quote Link to comment Share on other sites More sharing options...
Presidentlincoln Posted June 18, 2016 Author Report Share Posted June 18, 2016 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 Sent from my SM-G920V using Tapatalk Quote Link to comment Share on other sites More sharing options...
Strm Trpr Posted June 18, 2016 Report Share Posted June 18, 2016 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? Quote Link to comment Share on other sites More sharing options...
Presidentlincoln Posted June 18, 2016 Author Report Share Posted June 18, 2016 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 Sent from my SM-G920V using Tapatalk Quote Link to comment Share on other sites More sharing options...
Strm Trpr Posted June 18, 2016 Report Share Posted June 18, 2016 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 Quote Link to comment Share on other sites More sharing options...
Presidentlincoln Posted June 19, 2016 Author Report Share Posted June 19, 2016 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 Sent from my SM-G920V using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
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