motobecane ninja g3 - upjet?

Pete /

Mar 23, 2009 03:48PM

Sup everyone! I just installed a ninja g3 on my motobecane, replacing the stock exhaust, and I noticed that the performance got a bit worse, especially in the low/mid end.

I am running a ported 50cc with dellorto 15/15 #64 jet/filter, 2 balls/variator, head gasket. With this setup, sans head gasket, I was able to hit almost 40. Now I can barely stay around 30.

Would adding the g3 exhaust justify upjetting? Also the head gasket probably ruins performance too. Any suggestions?

thanks!

-pete / concord ca

Re: motobecane ninja g3 - upjet?

Jaym /

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jaym

Mar 23, 2009 03:50PM

nah. the G3 is just made for higher RPMs than you can get stock. go back to your stock pipe and only use the G3 with a kit.

Re: motobecane ninja g3 - upjet?

Pete /

robot909 OP

Mar 23, 2009 03:57PM

Cool, I'll probably install that 70cc kit and take it from there, was curious how much of a difference the g3 makes on a stock cylider. I agree with running the stock muffler on a 50cc cylinder, probably better.

Re: motobecane ninja g3 - upjet?

Bort Hoff /

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bret

Mar 23, 2009 04:02PM

ummmm, what? G3 is great with stock setups, especially if they're ported. It worked great for Elliot. you probably do just have to tune it in a bit.

You can pull 9500 rpms out of a stock cylinder, so thats not an issue.

Re: motobecane ninja g3 - upjet?

Jaym /

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jaym

Mar 23, 2009 04:13PM

hmm. on my stock ported setup the g3 was a bust on anything less than really long straightaways. never tried it with my variator upgrade, but i found the improvement, if anything, to be negligeble. was running a 66 on a 15/15 sha, decked head, ported cylinder, etc.

Re: motobecane ninja g3 - upjet?

Pete /

robot909 OP

Mar 23, 2009 04:17PM

The decked head probably makes a huge difference. I noticed a big performance improvement in the past when I took the head gasket out. That's definetly on my list to do.

Re: motobecane ninja g3 - upjet?

Bort Hoff /

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bret

Mar 23, 2009 04:24PM

Did you take the restrictor out of the back?

Re: motobecane ninja g3 - upjet?

Pete /

robot909 OP

Mar 23, 2009 04:25PM

Yeah, grinded that washer thing out.

Re: motobecane ninja g3 - upjet?

robot909 /

robot909 OP

Mar 24, 2009 03:17AM

Worked on this tonight, and realized I had a 60 jet in there, so after a few different sizes, I upjetted to a 73 and no air filter on the dellorto 15/15. On straight runs, I hit around 35 and no four stroking. The pipe sounds nice too.

Later this week, I'll install that parmakit 70cc, but I wanted to do some benchmarks first, for later comparison.

MOPED ARMY

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