I have a new exhaust on the way.... By mapbike (Read 763 times)

[mapbike]

Watched a vid on youtube and really liked the sound of this muffler, will probably need to go to a #120 or #125 jet after installing this pipe with the UNI Filter I also have ordered, my scoot has a #115 in it now but from what I have read i'll be needing to go up a bit more.

Anyone else have any experience with this exhaust?

Am I in the ball part on the size jet I will likely need when I say #120 or #125?

Thanks, Peace

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[sprocket]

Go up 2 sizes for the filter and 2 for the exhaust so.. #120 sounds really good...might get a #125 to work I would order both...

Make certain to oil that UNI filter with foam filter oil... saw a guy the other day that put an un-oiled UNI
on this 150cc and the engine lasted 3400 miles...

It is the OIL that does the filtering not the foam...

[mapbike]

Thanks for the advice on the jet size.....


Yep you are so right on the foam filter oil issue, I have 3 Nitro RC vehicles 2 Traxxas Stadium trucks and a 1/8 scale 4x4 Buggy, they all use foam filters and I use a very high quality foam filter oil on them, some people will put K&N Filter oil on the foam filters but I wont because it isnt tacky enough and isnt made for using on foam, it may work on a scoot that never sees dusty sirty conditions but I live in the country on a very dusty dirt road so I have to have all the protection I can get...!

I plan to redrill my stock jet to a #120 instead of buying a new one, a #120 Jet can be made out of a stock smaller jet by simply and carefully redrilling it with a 3/64's high quality bit, this is how I rejet the carbs on my motorized bicycles I have built, here is a chart that may help others if they have the tools and would like to redrill there own jets as well.


Jet Drill (Requires numberd wire gauge bits for most of the jets)
50 #76
55 #74 approx.
60 #73
65 #71 approx.
70 #70
75 #69 approx.
80 #68
85 #66 approx.
90 #65
95 #63
100 #61
105 #59
110 #57
120 3/64th's
130 #55
140 #54 150 #53
160 1/16th's
165 #52 approx.
170 #51
180 #50
185 #49
195 #48
200 #47
205 #46
210 #45
220 #44
225 #43
230 #43 approx (close to 225)
245 #41
250 #40

I know this has some much smaller and much larger jet size reference than we need on the scoots but it could be used for other engines as well so I just included the entire chart.

Thanks, Peace

Heres a link that has sound of the pipe....

Jul 17, 2011 18:17:04 GMT -6 sprocket said:

Go up 2 sizes for the filter and 2 for the exhaust so.. #120 sounds really good...might get a #125 to work I would order both...

Make certain to oil that UNI filter with foam filter oil... saw a guy the other day that put an un-oiled UNI
on this 150cc and the engine lasted 3400 miles...

It is the OIL that does the filtering not the foam...

[sprocket]

You are so right.. the foam oil must by sticky or it doesn't work well...K&N doesn't cut it on foam filters and motor oil is just a huge mess!