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Post by kevfra on Sept 22, 2013 11:05:29 GMT -5
New 300 miles Znen Kerrington 150 with the 16 inch wheels. I'm running 250 pounds dressed so I'm heavy but within spec of this scoot. But it knocks rather badly even under light demand. I'm running premium gas. It isn't a preignition ping, it's a knock.
Scoot runs great and has had no issues otherwise. I installed the three upgrade components of Iridium plug, hot coil and performance CDi which helped a bit, but still knocks.
The new CDI has a pot on it which I think is for timing adjustment, so it's possible I can accomplish something there, but I can't find any reference to this adjustment anywhere.
A clue is that the bike won't get above six grand. So I'm thinking if I can get up into the power band near eight thousand maybe that will be the answer. Weights?
Thoughts? Thanks!
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Post by jjoshua20213 on Sept 22, 2013 13:36:09 GMT -5
Sounds like you need to lower the weights a little.
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Post by Deleted on Sept 22, 2013 14:26:15 GMT -5
Raise the rpms it will knock more.
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Post by sailracer on Sept 22, 2013 14:38:53 GMT -5
Sounds like a timing issue.
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Post by tvnacman on Sept 22, 2013 15:52:31 GMT -5
Get a timing light on it . The POT could be an adjustable rev limiter . I have a 16" wheel scooter I'm using a variable timing CDI (non adjustable) , I have never heard a ping from my engine . What grade gas are you using ?
John
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Post by Deleted on Sept 22, 2013 18:41:09 GMT -5
How do you use a timing light on a scooter??
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Post by sailracer on Sept 22, 2013 18:48:31 GMT -5
[replyingto=redroush00]redroush00[/replyingto]same as on a car, Timing marks are on the flywheel or rotor.Some even have a small plastic plug in the fan cover.timing marks are right under it. Take a look at yours.right about at 10 or 11 o clock on the side of the fan cover.
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Post by tvnacman on Sept 22, 2013 19:33:58 GMT -5
same as on a car, Timing marks are on the flywheel or rotor.Some even have a small plastic plug in the fan cover.timing marks are right under it. Take a look at yours.right about at 10 or 11 o clock on the side of the fan cover. what he said John |
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Post by Deleted on Sept 22, 2013 20:15:27 GMT -5
Okay so it should just line up then? If its dead on then its not a timing issue.
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Post by rae4180 on Sept 22, 2013 20:19:32 GMT -5
check your valves.
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Post by kevfra on Sept 23, 2013 14:51:55 GMT -5
How do you use a timing light on a scooter?? And at what RPM? |
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Post by alleyoop on Sept 23, 2013 15:21:50 GMT -5
You can try richen it up a little, Turn the Fuel Ratio Mixture Counter Clockwise and see if that eliminates the knock. If not it is to advanced and you will need to retard it a little.
So if a little more fuel does not eliminate the knock, Take the Valve cover off bring it up to Top Dead Center as if your going to adjust the valves and check where the CASE POINTER is pointing to on the FLYWHEEL. That CDI could also be to advanced.
Alleyoop
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Post by alleyoop on Sept 23, 2013 15:33:39 GMT -5
You can try richen it up a little, Turn the Fuel Ratio Mixture Counter Clockwise and see if that eliminates the knock. If not it is to advanced and you will need to retard it a little.
So if a little more fuel does not eliminate the knock, Take the Valve cover off bring it up to Top Dead Center as if your going to adjust the valves and check where the CASE POINTER is pointing to on the FLYWHEEL. That CDI could also be to advanced.
Forgot to answer one question how to adjust the adjustable CDI:
To adjust an adjustable CDI. Turn the pot clockwise to advance, counter clockwise to retard.
Turn it only a little at a time and try it out to much in either direction the motor will run poorly.
Alleyoop
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Post by tvnacman on Sept 23, 2013 17:19:03 GMT -5
with a stock cdi it should not change at any rpm .
John
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Post by alleyoop on Sept 23, 2013 17:23:20 GMT -5
Read his first post he has an ADJUSTABLE CDI. He needs to back it off on the timing.
Alleyoop
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jet
..BAD TO THE BONE..