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BBK help.
Nov 6, 2019 14:02:49 GMT -5
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Post by scooterted on Nov 6, 2019 14:02:49 GMT -5
I try to idle around 1800-2000 rpm.
I dont want to go over 8500 rpm maximum. I try to be below 8000 rpm most of the time. I dont find much power past there anyway, and I dont want to burn through cranks like crazy.
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Post by scooterted on Nov 5, 2019 19:15:01 GMT -5
It happens. With paypal you should be covered.
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Post by scooterted on Nov 5, 2019 11:43:07 GMT -5
I looked up the scoot. Its a much better scoot than i was thinking it was (italian, not chinese). My bad. Id really like to see what you have though. 16s IS pretty fast. The ninja 250r i had was about that fast. I’ll ask my buddy if I can grab is chest go pro mount and get some recordings with it uploaded on YouTube or my Instagram. To fast to hold a phone comfortably. I can usually beat cars off the line and then if I’m trailing a car I can get a good 75mph. Stock gearing and cylinder. I am getting a 62mm ordered in. Taking longer then I want but will get me even more torque off the line You should do it for the scoot speed list. Not many 150ccs represented.
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Post by scooterted on Nov 5, 2019 10:51:55 GMT -5
I have gps records of all my runs. I use race timer which is a reliable app. I have to say it’s very very fast off the line. I’m going to try a stiffer spring. Maybe a purple malossi. I think maybe I’m launching in second gear which if I am is very impressive at the speeds I’m getting. I’d upload a picture of video here but don’t see that option unless I just link to YouTube or something? I looked up the scoot. Its a much better scoot than i was thinking it was (italian, not chinese). My bad. Id really like to see what you have though. 16s IS pretty fast. The ninja 250r i had was about that fast.
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Post by scooterted on Nov 5, 2019 10:22:41 GMT -5
You might be better off in the 100+cc section of this forum. Id look into the belt. Or maybe even a stiffer contra spring as i understand they put more squishing force on the belt. Or a very fast acceleration. It's a 150cc with 12-13hp. It does not accelerate very fast and it never ever reaches 85mph. Unless it's off a cliff. Im aware of that. I was only commenting that one doesnt neccesarily need 85mph to run a 16s quarter mile. However, that IS an incredible acceleration. I have to wonder where the op is getting his numbers. And if hes getting 1/8th mile and 1/4 mile mixed up.
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Post by scooterted on Nov 5, 2019 8:57:57 GMT -5
You might be better off in the 100+cc section of this forum. Id look into the belt. Or maybe even a stiffer contra spring as i understand they put more squishing force on the belt. Are you doing the quarter mile off a cliff ? 16 seconds require a top speed over the finnish line at approximately 85mph ! Or a very fast acceleration.
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Post by scooterted on Nov 4, 2019 16:36:07 GMT -5
Probably best to buy multiple sets.
If you need heavier than you have there are ways of making weights weigh a little more. Ive used the tin foil method myself.
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Post by scooterted on Nov 4, 2019 15:20:47 GMT -5
Yesterday i tuned wot. Tried 5 different jets and went looking for max performance did a plug chop for the richest, best performing jet. And one for the first jet that lost top speed by being too lean. Today i cut the plugs open, Both plugs came out looking the same. I have a limited choices for suitable tuning roads now. I only had about a half mile of tuning road available before i started going downhill and overreving. Looks very lean. But its my fastest jet. I tried a whole spectrum, the leanest ran fine but was slightly slower. The richest ran fine, was slightly slower and smoked. Im about to test out different needle positions. Fastest always isn't the safest. That, I would say, is too lean. Too hot of combustion chamber temps and you're gonna melt your exhaust valve. Not literally, but it could burn up, or warp/crack your head. Lean is mean, and only for a short period. That is true. I did move up a jet size. I feel like a 30-40 second pull wasnt long enough for a plug chop. I gotta find a place i can do one without overreving, without getting killed by traffic, and where i can get to going for a longer period.
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Post by scooterted on Nov 4, 2019 9:10:59 GMT -5
Its possible its an overheating issue. With the stock carb and airbox with a 47mm bbk i was running an 88 jet.
With a non stock airfilter you would have to have a larger mj.
This all does depend on elevation (for reference, im at 300-400ft elevation). An 80 mj seems small to me, and a lean mixture can be a source of overheating.
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Post by scooterted on Nov 4, 2019 7:58:38 GMT -5
Do you have a good compression gauge? The kind with the valve (like a tire valve) close to the compression area? If youre talking to me. Yes i do. Thats what i used.
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BBK help.
Nov 3, 2019 15:30:24 GMT -5
via mobile
Post by scooterted on Nov 3, 2019 15:30:24 GMT -5
I would expect an unblocked pair port could cause poor running. I made a blockoff plate with a small chunk of mild steel.
Easy peasy with the shop you have access to.
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Post by scooterted on Nov 3, 2019 11:19:55 GMT -5
Yesterday i tuned wot. Tried 5 different jets and went looking for max performance did a plug chop for the richest, best performing jet. And one for the first jet that lost top speed by being too lean. Today i cut the plugs open, Both plugs came out looking the same. I have a limited choices for suitable tuning roads now. I only had about a half mile of tuning road available before i started going downhill and overreving. Looks very lean. But its my fastest jet. I tried a whole spectrum, the leanest ran fine but was slightly slower. The richest ran fine, was slightly slower and smoked. Im about to test out different needle positions.
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Post by scooterted on Nov 1, 2019 12:43:50 GMT -5
If you want it painted, I say paint it yourself. Time to learn.
Thats what i would do anyway. People paint cars with zero experience
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Post by scooterted on Nov 1, 2019 12:01:45 GMT -5
Fwiw i actially tested all those with the carb disconnected completely. Just an open port.
Im 100% certain the domed piston/stock head combo would be even higher with broken in rings (I really wish i had thought to double check the way i installed the gauge.) Its (domed piston/stock head) a really tight fit in there, I was playing around with it before installing.
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Post by scooterted on Oct 31, 2019 16:46:25 GMT -5
I got the 50mm head install on my scoot done today. Compression was a wopping 255+psi cold. Unfortunatly, i dont think i have very good results to compare with like i hoped. I think when i tested the 50mm piston with the stock head i didnt get the tester on right (or i burned a valve on the stock head, dont see any damage as far as i can tell) I screwed the pooch on that but heres my results anyway. Stock* 180psi cold 47mm bore stock head* 205psi cold 50mm domed piston**, stock head 215psi cold 50mm domed piston*, stock head 195psi hot, 180psi cold??? I think i had the tester installed wrong here. 50mm domed piston*, 50mm head 255psi cold. *with broken in rings. **with new rings.
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