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Post by psoundz2011 on Sept 6, 2013 6:16:25 GMT -5
Hi all!
I have recently installed a 72cc bore kit and a bore sport exhaust on my bike. The installation all went well. I also dropped in a 6.5 g weight set to keep the rpm low during the break in period. I have 88main jet and my plug is nutty brown after a bit of modification to the stock air box.
I have the following issue since the installation:
When I trying to tune the carb with the af screw its basicly does nothing . Even if I completely close the screw the bike still running. Befor the bbk installation if I closed the af screw the engine died. I thought with the bbk I will need larger slow jet but it seems like I need a smaller one. Does that make any sense to bore the engine and go for smaller slow jet? Any thoughts?
Thanks
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Post by pgs on Sept 6, 2013 7:14:27 GMT -5
i went with a larger pilot jet on mine and it was terrible, the stock one with the carburetor i got was 38 i used a 40 and was too big ended putting the 38 back in idle was great with that
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Post by f4milytime on Sept 6, 2013 21:08:48 GMT -5
I have yet to change my pilot from stock. The original one has always worked well with my 47mm & 50mm kits.
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Post by skuttadawg on Sept 6, 2013 22:35:01 GMT -5
Is this a 4T or 2T engine ? What size carb ? What size idle jet ?
On my 2T which had a 40IJ it always idled weird at times and had to adjust the idle speed as the weather changed . I installed a 70cc BBK and it got worse . It started fine but would not idle for a long time without slowing down and wanting to stall . I installed a 45 IJ and it now purrs like a kitten .
Did you run the air/screw all the way in and run it out 2.5 turns ? Try this with the engine warm instead of cold . When it stalls from running it in means not enough fuel in which a size up IJ or it may need to be cleaned
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New Rider
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Post by psoundz2011 on Sept 7, 2013 3:32:53 GMT -5
I have used some seafoam yesterday wich makes the idle better and It's not going up and down now. It also helped starting the bike for the first time. Since I let the bike running on idle for few minutes and checked the plug wich is nutty browni think I won't change the pilot jet. I might try a size smaller at some point to see if its still improve acceleration. Thanks guys!
Also I use the stock airbox, does uni filter will improve a lot with a sport exhaust? How loud would that be? The sport exhaust quiet loud already, but the bike is 4t so at least is not that annoying 2t sound... It's sound like a proper bike.
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