Roughhouse Conversion Help Needed

JewelryMonk · Post by **JewelryMonk** » Wed Jun 10, 2015 4:24 am

I just installed the Stage 2 conversion:
I replaced the piston and cylinder to 70cc, replaced slides and spring, put on the Prima pipe, and changed the jetting from 82 to 95, which came with the kit. I fired it up and it started and idled fine. When I went to test it on the road, it had absolutely no response to giving it gas, just barely putt-ed. I removed the airbox to see if more air would help, and it did a bit. It didn't have any bottom end acceleration, but got up to about 35mph. I noticed if I gave it more gas, it would bog and I could feel (with my hand) a spray of gas coming out of the carb.
Is this all a jetting issue and do I just need to play with jetting until it is satisfactory? I am contemplating going to a 19mm carb and a performance air filter, but that doesn't help me today.
Thank you for your help.
Doug

viney266 · Post by **viney266** » Sat Jun 13, 2015 3:23 am

Sure you didn't put the piston in backwards?

There should have been a small arrow on piston, is it pointed toward the exhaust?

JewelryMonk · Post by **JewelryMonk** » Sat Jun 13, 2015 4:18 pm

I did pay attention to that, made sure it was in right.

avescoots1134 · Post by **avescoots1134** » Thu Jun 18, 2015 3:32 am

Try putting the stock exhaust back on. You may need different rollers or clutch springs to use the Prima pipe. The Prima pipe robs all the bottom end.

lovemysan · Post by **lovemysan** » Tue Jun 23, 2015 6:06 am

Pretty sure I jetted my malossi 70cc/prima pipe combo to a 105. Also I replaced the reeds with carbon fiber that came with my kit.

JewelryMonk · Post by **JewelryMonk** » Sat Jun 27, 2015 8:55 pm

I bumper mine up to an 118 jet, and I probably need to go up a bit more. Plug still white. I have good mid to upper range, but still bogs out at lower end and a bit at top speed. I raised my needle one notch, and will see how that works.