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06-12-2017, 11:41 PM | #1 | |
Join Date: Jun 2013
Posts: 14
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Quote:
Thanks for the reply, i appreciate it. Your memory is fine! yes a SYM build 4 stroke Sadly i did not take any compression or temp reading - as i do not have the tools. It does "feel" like its running hot. i checked the plug and its black, but its also from last year. I'll put a new one in a start it up and check it out tomorrow. I was playing around with the mixture setting, but it had little to no affect. Maybe i'll put the stock jet back in? None of them are marked, so i don't know the actual size of them. I also confirmed the timing is bang on, and the rockers are at .004. Also on the stand and rev'ing, it seems like its restricted. Previously i could go to 9k, now it struggles to get to 7k. ...should have went to a 80cc kit |
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06-13-2017, 10:02 AM | #2 |
Join Date: May 2017
Location: Norfolk, VA
Posts: 532
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Another thing I just thought of, and this is actually very important. Did you do a leak down test after it was re-assembled? If you are getting air in anywheres then setting the carb will be extra hard to dial in. Heres the crazy part. The new plug wont really read a accurate color (as far as rich or lean) until you get some WOT runs on it first. The Moped Army website has a pretty good plug reading guide for tuning. So if the scoot wont do WOT runs then you have to get the basics down first so you can do WOT runs. I dont think down jetting the main is a wise choice, and Im pretty sure you will have to up the pilot. Tuning is part science and part patience. Oh, and I hate those "No number" jets! We use the factory jets to the brand of carb we are working with. I still think the belt is pulling into the pulleys early, meaning re-tuning the trans to match the bigger motor is in order.
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