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Post by insanitywerks on Feb 28, 2018 12:44:27 GMT -5
hello I was wondering if my scooter stock pilot jet is 35 what would happen if I went to a bigger size?
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Post by tortoise2 on Feb 28, 2018 13:33:03 GMT -5
Stock configuration 139QMB? |
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Post by jackrides on Feb 28, 2018 14:09:41 GMT -5
Do it and tell us about it!
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Post by lilpinny on Feb 28, 2018 16:39:18 GMT -5
hello I was wondering if my scooter stock pilot jet is 35 what would happen if I went to a bigger size? It would get more fuel into your air/fuel ratio. Usually if you pull the air box and modify the exhaust you'd go to a 38. |
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Post by insanitywerks on Feb 28, 2018 18:43:44 GMT -5
ok trying to figure out a way to squeak a few more miles per hour out of the bike without doing a big bore kit. under 50cc here no motorcycle endorsement needed. have gotten the bike to do 43 but that is on a smooth road.
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rdemilt
Scoot Member
Posts: 94 
Location: Sunny Florida
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Post by rdemilt on Feb 28, 2018 20:38:18 GMT -5
ok trying to figure out a way to squeak a few more miles per hour out of the bike without doing a big bore kit. under 50cc here no motorcycle endorsement needed. have gotten the bike to do 43 but that is on a smooth road. Changing the pilot jet will help with overall tuning but is not going to get you any more top speed. 43 is actually good for a 139QMB. |
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Post by lilpinny on Feb 28, 2018 20:40:10 GMT -5
Polini varilator, sliders
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Post by jeff84 on Feb 28, 2018 22:35:58 GMT -5
lots of little changes can make one big one. I think its called tuning. but if you want to squeeze a little more but don't want to do any engine mods, then an aftermarket variator and adjusting weights and clutch/contra springs. the final drive gears can be changed, but unless you up the power of the engine the gains will be little if any. a simple thing to do is an offset woodruff key to advance the timing a few degrees.
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Post by GrumpyUnk on Mar 1, 2018 12:42:32 GMT -5
To add to what Jeff said, you can enlarge the mounting holes on the ignition pickup and move it a bit to advance timing more than factory. See 90gtvert youtube mod video. You can use a file or a Dremel-type tool to ovalize or elongate the mounting so the pickup will 'find' the timing piece 'sooner' in the crank rotation.
tom
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Post by jackrides on Mar 3, 2018 22:20:09 GMT -5
Have you gone thru the ScootFaq yet? There's a whole lot of great info there!
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