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Post by supermel74 on Jun 14, 2010 16:04:18 GMT -5
One last question(hopefully), how much adjusting does a new carburetor usually require after it's on? Idle, mixture etc?
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Post by 90GTVert on Jun 14, 2010 18:07:03 GMT -5
You should adjust the idle, mixture, needle, and cable as necessary, and of course transfer the main jet from the other carb that worked for you. It's possible that you'd get lucky and do the jet swap and it will run OK.
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Post by supermel74 on Jun 14, 2010 18:11:54 GMT -5
So the jets from the Mikuni should fit if I go with a different brand carb?
Edit: I finally found a guy who works on them who will be picking it up on Wednesday. I actually had called at least 5 small engine repair guys tell me that they won't even touch scooters. :bfg: Hopefully by the weekend I'll be doing this again :riding:
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Post by supermel74 on Jun 25, 2010 12:17:07 GMT -5
Update: Got the scoot back Wednesday. The guy cleaned the carburetor and put the 90 jet in. It runs great now except that it only does around 40 mph, which sucks considering it was doing around 47 before the new pipe went on, and varying between 42-51 after(not sure why there was such a difference but was getting better than 50 on a few hot days) Is there anything simple that I can do to get my speed back? I wanted to pick up a few mph, not lose 7. Will heavier weights make a noticeable difference or just a couple mph? Is it possible the throttle cable isn't opening enough or something? Would that cause top end to drop? It gets to 40 fast, and then pretty much just stays there.
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Post by 90GTVert on Jun 25, 2010 13:08:11 GMT -5
If the throttle wasn't opening all the way it would definitely affect top speed, and should affect acceleration.
The difference heavier or lighter weights make really depends on what it's doing now. if you are getting gull travel of your belt, heavier weights won't do anything more than drop your RPM and maybe slow down acceleration. If your weights are way too light it could make a big difference in top speed.
You can make a mark on the variator face that goes from the center to the outer edge using a permanent marker and then take it for a ride, trying to top it out. What's left of the mark will show you how far your belt is from the edge of the variator.
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Post by supermel74 on Jun 25, 2010 13:31:19 GMT -5
Noted. Would a longer case/belt (878 compared to the more common 788) possibly require heavier weights to make full travel? I know almost anything is possible and I'll need to try to be sure. Just wondering because most people seem to do ok with the included 4.3g weights. From all the reading around the web I've done, I seem to be one of the the only people who actually lost speed adding a pipe/lighter weights/stiffer clutch springs. The only sure variable I can think of is the longer case on my scoot compared to most minarelli powered 2 strokes.
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Post by 90GTVert on Jun 25, 2010 16:15:41 GMT -5
I suppose it may need more force to move a longer and heavier belt. Sounds reasonable in theory, although I'm not sure how it works in practice.
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Post by supermel74 on Jun 25, 2010 20:20:04 GMT -5
Yeah, I'm no physicist for sure  I'll give it a whirl next nice day. Not sure what this means, but today after going up a very long hill and reaching the top, the thing seemed to get a massive power/speed boost. It was on a slight decline, but the the power increase was more than I'd normally see if I had just come onto that level of decline from a flat stretch. |
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Post by 90GTVert on Jun 25, 2010 22:00:59 GMT -5
How long did this power boost last?
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Post by supermel74 on Jun 25, 2010 23:57:03 GMT -5
It's hard to say exactly because the road only stayed level for about 1/2 mile and then turned to a downhill stretch. It felt like the full power/torque that it took to climb the hill was maintained when I hit level ground.
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Post by duosport on Jun 26, 2010 8:06:35 GMT -5
Actually you need to brake for better results. WOT, hit the kill switch, brake quickly so the engine stops, check the plug. Do you need a brand new plug for this test? In other words, my plug in chocolate brown right now. If I use the existing plug and it is too lean or too rich, will the plug become whitish or blackish? |
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Post by 2strokd on Jun 26, 2010 12:37:26 GMT -5
Sometimes they will burn the dark brown to a lighter one. If its ashy or looks like the dark brown stuff got hot then you know its lean. It takes a skilled plug readers eyes to really tell using an old plug. You should try a new one. Put the new plug in after the scooter is already been riden and semi warm. Then go ride at WOT as much as possible for a mile or two. Check the plug ASAP without letting the scooter idle at all if possible and shut it off. Let it cool a bit then pull the plug and see what you have for color?
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I'll give it a whirl next nice day. Not sure what this means, but today after going up a very long hill and reaching the top, the thing seemed to get a massive power/speed boost. It was on a slight decline, but the the power increase was more than I'd normally see if I had just come onto that level of decline from a flat stretch.
