Getting the tachometer to redline By moss8448 (Read 1,385 times)

[moss8448]

my scoot seems to top out at 7000 rpm and the redline is 8000. I was of a mind that it should atleast touch the redline every now and then; it will after a few minutes show 50mph indicated and was thinking that after seeing articles on removing the washer/bushing looking deal on the variator that it will allow higher rpm without having to go thru a lot of buying aftermarket cdi's and what have you... so the question is....drum roll....cymbal crash...is this true and if so why and if not...why not and what would be the best way to squeeze more rpm and not go hog wild and trash the engine....which I hear anything over 9500 will do...

[JR]

The safest and easiest way is to find out the weight of you rollers and drop the weight by at least 1 gram which will add about 500 rpm, or go to sliders, which will add about 350 rpm but maintain the top end you have now.

[cruiser]

JR's advice is the easiest and best way to gain rpms. It will also generally increase acceleration.

150cc scoots are usually not restricted mechanically like you describe. There really is no reason to restrict these scoots as they are considered to be motorcycles and do not have legal speed restrictions imposed on them like a moped (50cc). Restrictions which do occur are emissions related. This will generally result in the main jet being leaner than that which will give best performance. You may have a restricted CDI which can limit the rpm, but most scoots do not have this restriction.

Like JR says, variator tuning will give the best results. If you notice that the rpm is still limiting at 7000 after going to lighter weights, then the CDI is probably restricted.

[sprocket]

Don't believe the tach on Chinese scooters.. they are frequently incorrect

Adjust your valve gaps

[moss8448]

yeah it does seem like they throw darts to set up the accuracy on the tachs and speedos...and after a lotta judicious manipulation got the valves adjusted, out of the box the exhaust was on the tight side and this being a' fresh from the garden' scoot she is breaking in little by little on the quicker side and the tach is slowly crawlin' up the scale...and I do think those rollers tend to be 'out of the box' tight also and when you put em on the stand and rev it up that causes the back wheel to shimmy more so that an out of balance situation..all in all I should keep my trap shut til it has about 500 miles on it and go from there.....
Sam~

[moss8448]

I meant the clutch on the shimmy thing

[blitztek]

the shimmy is because they don't balance the wheels at the factory. that's why kymco's don't shimmy. factory balanced wheels.

I would not rev out the motor ever. much less before it breaks in. change that oil often while breaking in. It's the best thing you can do for that new engine