lennie86
Scoot Junior
Freezing
Posts: 11
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Cdi
May 10, 2020 15:49:36 GMT -5
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Post by lennie86 on May 10, 2020 15:49:36 GMT -5
Can you install a performance cdi and ignition coil before you began your breakin period?
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Post by FrankenMech on May 10, 2020 20:04:48 GMT -5
The 'Performance' parts seem to have short lives and other problems. Stick with the OEM style units.
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Post by Zino on May 10, 2020 21:07:34 GMT -5
Performance cdi's dont add much if anything over stock cdi's How you rev it up and beat on it oil carb setting effects break in the most .
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Post by rocketdogiv on May 21, 2020 20:32:31 GMT -5
The coils work ok but the OEMs are just as good I think. Don't use a "Performance" CDI. I've found they aren't worth a dime unless you get an adjustable one. They just advance the timing to much at idle and will make a stock 150 a poor starter. Want more acceleration? Put your money in the variator. Lighten the weights a bit..
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Cdi
Jun 23, 2020 2:00:02 GMT -5
Post by mahadin on Jun 23, 2020 2:00:02 GMT -5
Hi, Its my first message in this forum and i have found 49ccscoot youtube channel very informative. what i would like to know is in one of his video relating to performance cdi and ignition coil change (https://www.youtube.com/watch?v=p63JXW29tVo) he did mention a fall in rpm after slightly advancing the pickup coil. How did he over come that issues it was a bit unclear. Plus I have a 150cc honda cb i have changed the outcoil and went for a performance outcoil plus changed the carburetor to 28mm pwk. I'm experiencing a bit of a bike hickup or jerking what ever you may call the experience is but at around 7k rpm the bike jerks it feels like i'm loosing power and than it get backs into it, any solution for this. Plus would also like to know how would i increase the the rpm range in a bike, which modification will allow to increase a bikes rpm without damaging the engine.
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Cdi
Jun 24, 2020 1:12:42 GMT -5
mahadin likes this
Post by rocketdogiv on Jun 24, 2020 1:12:42 GMT -5
Hi Maha. What was the stock carb on your Honda 150cc? 24mm CV? Sounds like you've got to much fuel to me. Something I've learned, which I really already knew, is that a mechanical carbs needs to be sized correctly. It's the most important consideration. Putting a larger carb on a stock bore and stroke has no benefit.
When I was 16, 1971, I was able to own several used American muscle cars. The # one mistake we made was taking the stock carb off of them and putting a mechanical Holley carbs on them. The stock carbs, Rochester, Carter, FoMoCo had Vacuum Secondaries on the 4 barrels. Just adjusting the stock carbs would have been much better. It's not that you can't make them work, you can, but there is really no benefit.
A 28mm is too large for a 150cc. Put the stock carb back on and get a few larger main jets.Worry about the timing and ignition later.
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Cdi
Jun 24, 2020 7:08:21 GMT -5
Post by mahadin on Jun 24, 2020 7:08:21 GMT -5
Hi rocketdogiv. Thanks for your reply the stock carb size was 22mm. The bike is more of a commuters bike so I just wanted a bit more oomph out of it. But you guessed it right it's guzzling gas a lot. During this qurantine wanted to do some home project had a 28mm carb from a 250cc thought of swapping it in. What would you suggest I do to increase the power on my bike. Will change back to my old carb as you suggested. Once again thanks for the advice.
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Cdi
Jun 25, 2020 20:52:44 GMT -5
Post by rocketdogiv on Jun 25, 2020 20:52:44 GMT -5
I always suggest changing the variator weights first. Matching them to your weight and the engine rpm is a cheap and fulfilling mod. Scooter manufacturers can't size them for everyone. You want a stock gy6 to run 6500 rpm or above throughout the variator range. Any change in the engine, different gears, different cams, different bore or stroke requires a change in the roller weights. I suspect a Honda has a pretty good tachometer on it, no? If not buy a cheap one that wraps around the spark plug wire. An accurate tach is your friend modding these things.
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