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Post by jaciche on Oct 23, 2017 12:02:25 GMT -5
My scooter appears to be running slightly lean as I would expect it to be. From what I read, most of the chinese scoots are tuned to run lean out of the crate. I have 300 km on mine now. My question is, how much of a higher jet size should I go with if I dont modify the air intake or the exhaust or anything else? So if I have a 100 jet in there now, could I go to a 103,105,110? I want this thing to be reliable and if I can pick up some more power on the top end, that would be great. Thanks
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Post by tortoise on Oct 23, 2017 12:51:56 GMT -5
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Post by lostforawhile on Oct 24, 2017 21:00:17 GMT -5
what size scooter would help?
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Post by wheelbender6 on Oct 24, 2017 21:12:16 GMT -5
Proper jetting will make your engine last longer too.
Jets are normally sold in kits of 3 or more because there is no magic formula for the size that works well.
Start by adding the next size bigger jet. Ride it for a week and look at the plug again. You want a nice tan color on the ceramic electrode.
Backfiring or burbling during deceleration are signs that you are running lean.
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Post by jaciche on Oct 25, 2017 9:46:36 GMT -5
what size scooter would help? Sorry, its a 150cc GY6. Apparently the brand is Yiben and the model is YB150T-9. I have ridden it for about 75 miles (121 km) and it has backfired once right when i got on the throttle from a dead stop. The mid range power seems to be good but once i get above 40-45 mph the power really drops off which leads me to believe that the main jet is a bit too small. The exhaust can is very hot after I ride it, I'll put my temp gun on it after my next ride. The oil level is at the proper level in the reservoir. I live in Wisconsin so the weather is getting cold. I may put it away for the winter soon. The plan is to go 1 or 2 jet sizes higher on the main jet and bring out the idle mixture screw about an 1/8th of a turn, maybe a bit more if needed. |
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Post by tortoise on Oct 25, 2017 10:35:21 GMT -5
live in Wisconsin so the weather is getting cold Cold fuel physics? |
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Post by jaciche on Oct 25, 2017 11:01:25 GMT -5
live in Wisconsin so the weather is getting cold Cold fuel physics? Am I going to find this when I try to adjust the idle mixture screw? |
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Post by lostforawhile on Oct 25, 2017 11:15:49 GMT -5
Make sure your muffler isn't clogged they hide a converter in these now, mine was clogging and getting super hot I will post a picture of the convulted mess that was inside
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Post by tortoise on Oct 25, 2017 11:34:04 GMT -5
Am I going to find this when I try to adjust the idle mixture screw? Probably tamper-resistant fuel bowl fasteners as well! |
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Post by jaciche on Oct 25, 2017 11:41:31 GMT -5
Great. That will be a pain, but nothing that cant be fixed. I may just drill and use a small easy out on those too. It's not a big deal as long as I can find replacements for them at the hardware store.
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Post by jaciche on Oct 25, 2017 11:44:29 GMT -5
Make sure your muffler isn't clogged they hide a converter in these now, mine was clogging and getting super hot I will post a picture of the convulted mess that was inside I was tossing around the idea of de-restricting the stock muffler or not to. Does is matter what type of muffler they put on there too? I have the gray aluminum style that has a "burn warning" plaque riveted onto it. |
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Post by lostforawhile on Oct 25, 2017 12:02:16 GMT -5
Its not critical like on a 2t, there is no way to derestrict the stock one,if yours is designed similar, I can't post a picture until I get home later
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Post by lostforawhile on Oct 25, 2017 12:04:48 GMT -5
I had to ride home with a hammer once,and keep beating on the muffler to make it to the house,part of it collapsed inside,people must have thought I was crazy
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Post by jaciche on Oct 25, 2017 12:10:04 GMT -5
lostforawhile Lol thats funny. I have this style of muffler. I was thinking about doing the same thing that this guy does.
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Post by lostforawhile on Oct 25, 2017 19:32:29 GMT -5
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