Post by uberscootin on Sept 20, 2012 17:30:59 GMT -5
i have a 02 yamaha/ minarelli 50cc 2t, i removed both restrictors and i need to know how big do i go with the main jet? it is a #64, but after a plug chop it looks lean and it acts like its running out of gas on top speed and climbing hills also what is the ideal rpm range for power on this engine?
Last Edit: Sept 20, 2012 17:41:25 GMT -5 by uberscootin
If it's totally stock, I think a 78 main is stock (it was on my zuma when I bought it). What restrictors did you remove? You might need to upjet to accomodate those modifications. And proper rpm range for a stock zuma is around 4,500-7,500 rpm.
2008 Yamaha Morphous 250cc/72mpg 2001 Yamaha Zuma, Stage 6 69.5cc race cylinder, Molossi red torque spring with torsion control, Technigas Next R exhaust, 21mm Dellorto carb, 100 main jet, clutch engagement 6k rpm, variating @ 9300 rpm, tachometer, 55mph on level ground@10,500 rpm, 13/44 primary gear, and why don't they sell stiffer than stiffest clutch springs? 45 mpg
Post by uberscootin on Sept 22, 2012 0:28:29 GMT -5
gregw, the vino has a #64 main from the factory according to the service manual, i upped it to a #71 today, its stupid fast on take off but is still stumbling at wot and on hills, gonna tweak more tomorrow, gonna take gas tank off and check fer water, i hit 45.6 mph down hill earlier, stock original belt and rollers they were 5.5 gram but i ground half a gram out of each with a dremmel just to see if i gained any top speed, looks like i gained .6 mph.. oh ya the restrictors i removed was the one in the exhaust and the one in on the variator
have to agree...a #64 is WAY to small...unless you own a weedeater..I typically put in a #72 for folks if all else is stock.
JONWAY Hornet 2 stroke 72 cc BBK #90 main jet 5 gram Sliders 1,500 rpm clutch springs 1,500 rpm contra spring Stock exhaust Performance CDI Koso oversized variator 60 watt Stereo,CD,MP3 player with subwoofer.
wereed: HOw can I start a thread?
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wereed: or respond to a thread I started three years ago...
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