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Post by typhoon on Sept 5, 2011 12:36:23 GMT -5
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Post by 90GTVert on Sept 5, 2011 15:17:16 GMT -5
No idea what the stock jet is, but most likely you will need a larger one than stock.
Any idea what the squish clearance or is or compression test results? Sometimes the kits aren't setup well out of the box and if the squish clearance is really loose it'll feel like it has very little torque.
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Post by motorhead on Sept 6, 2011 10:37:03 GMT -5
Hey Brent, I've tried upgrading a stock 2t with a cylinder kit before while leaving the exhaust stock and I had similar results like typhoon did even after upjetting from 55 to 75. Shouldn't he/she get a performance exhaust first or can the 60cc kit really improve performance by it self?
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Post by 1quikvento on Sept 6, 2011 12:15:47 GMT -5
My experience with putting a 70cc kit on my 49cc wasnt too good. I felt that overall power was pretty much the same. I noticed just a tad bit better acceleration from 20 to 40mph. I mean a small tad. Once i put a pipe on it I was HOLY SHIT!! i went from cruising at 40mph to cruising at 49.5mph. top speed 51. I was amazed.
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Post by 90GTVert on Sept 6, 2011 13:41:57 GMT -5
A pipe would be nice, but I don't even think anything aftermarket is made for his scoot. I believe it's the chain driven 2T. I've used stock pipes with BBKs with success. As long as the stock pipe is not restricted it should work fine. I've gone up to 96cc now with a stock 49cc pipe working just fine.
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Post by 1quikvento on Sept 6, 2011 18:25:25 GMT -5
" Ive gone up to 96cc now with a stock 49cc pipe working just fine".
Ive read about quite a few people having good results with this. Ive been working on opening up and making my stock siverstone more free-flowing. Amid other things, Ive been doing a little to it everytme I get a chance, following the thread in the tech library of course.
No aftermarket support for a certain motor has to be a bummer. Time to be creative!
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Post by 90GTVert on Sept 6, 2011 19:43:48 GMT -5
Don't bother. The exhaust you have is the same one I modded. Didn't make a difference. If you look at the Project 90 thread you can see my results with it vs another style of stock 49cc exhaust.
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Post by motorhead on Sept 9, 2011 13:46:08 GMT -5
At my shop a 50cc minarelli came in and the guy wanted a 70cc put in. He was running a 70 jet with his stock cylinder. So... I installed the 70cc kit with a 90 jet but the scoot was even slower than stock. It took a 110 jet to get the kit to be faster than stock. I think a 95 jet would give you what you are looking for. |
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Post by typhoon on Sept 21, 2011 15:05:27 GMT -5
Would a Mikuni Small Hex Main Jet be the correct 95 jet for this scoot and where to buy? |
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Post by typhoon on Sept 21, 2011 19:01:05 GMT -5
after some research, and looking at oem jet (with no markings) it seems to be a mikuni small round main jet so will try the #95
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Post by typhoon on Sept 25, 2011 13:17:22 GMT -5
after some research, and looking at oem jet (with no markings) it seems to be a mikuni small round main jet so will try the #95 anyone khow what the stock main jet size is. I cannot see any markings or stamp on my main jet |
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Post by jmkjr72 on Sept 25, 2011 14:21:55 GMT -5
i have no idea what the stock size is
the one i have had the pleasure to work on nothing was marked and it even had odd seat angles in the jet
and the airbox alos had a huge restriction in it also it had a cone in the pipe
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Post by typhoon on Sept 27, 2011 17:43:48 GMT -5
i tried a #95 main jet and seemed better but had to move the clip on pin to the top groove as mid-range mix was too rich. Also removed baffle in air box which helped. This seems to get the best results but I think maybe #95 is too big.
The low end is still poor but top end is better
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Post by typhoon on Oct 3, 2011 3:48:32 GMT -5
not sure what jet to drop to ,.... 90 or 85?
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Post by 90GTVert on Oct 3, 2011 6:54:52 GMT -5
One step at a time, 90.
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