RPM won't go above 6K, suggestions? By extremejoy (Read 11,479 times)

[extremejoy]

[replyingto=extremejoy]extremejoy[/replyingto]After some "Superman Kung-Fu Grip" I was able to close it back like this...

Now the idling is not as bad, seems to be leveled off but I'll keep an eye out if it will fell off again.

To be honest I have no clue what that thing is but when it was off I can hear the vacuum sound coming from the small hole so I figured it's the problem...I think?

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[alleyoop]

That looks like the canister for a EGR emissons or PAIR system on your scoot. The top little hose is the VACUUM LINE and that should NOT be off otherwise it will loose Vacuum for your Petcock and what not.
If you can tell me what the bigger hose is coming from I can tell you what it does. If it is an EGR system there will be a VALVE WELDED onto your exhaust pipe, and one hose connected to it and the other hose going to your AIR BOX or AIR TUBING.

If its a PAIR system one hose will be coming from a VALVE connected to the VALVE COVER and the other hose most likley just hanging free to suck in air.
Alleyoop

[extremejoy]

Yeah, the bigger tubes are pretty much an "escalator to nowhere". I followed the big hose on the opposite side of the small vacuum line through and it just an left to just hanging there, not connecting to anything... The bigger hose next to the vacuum though goes to the area next to the valve cover where the recirculating pipe is.

I took it out for a semi-distance ride and after it being on a constant throttle the idle seems to be leveled off now. I hope all vacuum stays where it go or I'll have a sad scooter again...

[alleyoop]

Cool, you have the PAIR emissons on the scoot, it sucks in fresh air on the exhaust stroke. Many folks take it all off and plug up the hole on the head with a steel plate. Right now if you want to adjust your valves you have to take unbolt the Upside down CHROME pipe in front of your valve cover.
Alleyoop

[extremejoy]

Yeah, that's almost the same valve cover I have.

I finally grew enough testies to ride the scooter to work today, idle kinda rough but not as bad as when the cap came off. I was on the long stretch of road behind a a-hole van that almost ran me over (the ego trip some of these people have...) but the plus side of that was I was able to push the top speed almost at 60MPH, RPM still stays the same at 6100 or so... ((*

With all the issues that I had this past month I felt like the Lama from "Emperor's New Groove" when he was turned into so many animals and was very happy to turn back to a lama again...in short, I'm back to original situation on page 1 of this thread trying to get more MPH out of this pony...

On the very positive side, I have done so much on that scooter on my own that I'm quite comfortable working on it myself. ;D Well, as long as I don't have to open the crankcase which I'm still intimidated with that area.

[bosse99]

I cut in here.

I had a 50cc a couple of years ago and elaborated back and fourth with weights, springs, clutch and God knows what to gain top speed. I gained top speed but lost power uphill or the opposite. I spend some money there but went back to original setup and got it running (with the pink cable cut) at about 55 km (35 mph) on level road. The carburetor has to be calibrated exactly, that's nr.1 if you ask me.

What i really wanna say, now that i have a Yamati 150cc -07 since a couple of weeks ago (2800 km), is that there is a lot of questions in different forum about gaining speed. We have 150cc and we can't make magic with that kind of engine. I got a new original belt (842 20 30) that is 2 mm wider than what i had and 12 gram wight instead of original 13 grams. The carburetor is calibrated exactly and that took some time (having a rev counter in the dash really helps).

Full throttle from standstill and the rev goes up to 6 000, waits half a second and then goes straight up to 7 500 and accelerates nice (even uphill). At 80 km/hour the rev climbs to the red line at 8 000 and gains a little more speed, 88-89 km/hour. Downhill I hit 100+ km/hour. The only way to really gaining speed and torque is to put in a 170cc but that's only what i think.