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Post by lshigham on Feb 11, 2011 13:04:30 GMT -5
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Post by 90GTVert on Feb 11, 2011 14:00:40 GMT -5
I think that might be worth it just for the timing. I'm surprised you have to install a new woodruff key. I figured they'd handle all the timing with the CDI. I'm guessing it must be easier to program one by just setting the base timing where you wish and making a linear "curve".
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Post by lshigham on Feb 11, 2011 14:36:10 GMT -5
So was I, but I'm not about to complain as it's the only variable timing CDI I could find. Should give a nice boost in both the top and bottom end. Assuming of course that the CDI-coil unit is the problem  |
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Post by 2strokd on Feb 11, 2011 14:54:15 GMT -5
Nice. Even if thats not the problem that is a good buy IMO!
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Post by lshigham on Feb 11, 2011 15:51:27 GMT -5
I've removed my first flywheel (never had the need before), it was easier than I expected with the correct tools. All ready for the CDI, it'd better arrive now!
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Post by lshigham on Feb 13, 2011 4:04:52 GMT -5
New CDI-coil, same old problem :rant:
I noticed that it gets perceivably worse if you go up a hill. Normally I would associate that with the load, but it occurred that it also changes the float bowl level. I've set the float level and cleaned the carb out.
A plug chop done in one of the throttle positions it doesn't four stroke is completely black, and my usual MPG has been halved.
It still doesn't explain why it'll run like crap for the first 100yds or so then sort of behave itself. I've checked and the crank case isn't filling up with fuel :help:
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Post by 190mech on Feb 13, 2011 6:52:11 GMT -5
That does sound like a flooding problem,do you have a vacuum petcock?Fuel can leak past the shut off diaphram and run into the intake thru the vac hose.Also a good check would be to remove the carb,turn on the fuel valve,hold the carb at the same angle as installed and see if it starts to drip.Ive read on some ATV forums about OKO's being very sensitive to float height..
Good Luck!
PS,Id love to know if that CDI actually does have a curve,please check it for us next dyno visit! Thanks, John
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Post by lshigham on Feb 13, 2011 8:23:41 GMT -5
The fuel tank on these is between your legs, so it has a Mikuni vaccum pump as the carb is above the tank. I've tried sucking on the vacuum line, no fuel or anything untoward came out. I've tried holding the carb (with a full float bowl) at it's fitted angle and blowing down a piece of fuel line attached to it, to verify that the fuel float is sealing, which it is  I did notice that it has quite a hefty exhaust leak, but surely that would cause a lean condition? Anyway, I'll fix it in a bit. Thinking about it, the major problems just after after startup could be caused by the slip joint leaking, then, as the inside heats up more than the outside it will expand more and partially seal it. Unlikely, but I'm out of ideas. It's due for it's crank, flowing and porting a week Monday, I'll let you know what the CDI's like then John. And show you a bigger, better Dyno graph  |
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Post by lshigham on Feb 14, 2011 6:15:49 GMT -5
An update, fixing my exhaust solved the low end problem, but it still stutters and misses over 11k. I hate multiple problems, it confuses things. It's possible that there is still an ignition problem, I only revved it on the stand when testing the old CDI, and didn't encounter the RPM's that the top end problem occurs.
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Post by shakerdriver on Feb 14, 2011 9:10:52 GMT -5
have you considered the coil or plug wire? it may also be a bad ground to the frame or motor. just a thought.
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Post by 90GTVert on Feb 14, 2011 9:32:24 GMT -5
He replaced the CDI and coil. Checking grounds and all other ign related connections is a good idea.
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Post by lshigham on Feb 14, 2011 12:43:03 GMT -5
I've checked all the ignition wiring (all 2' of it, it's a very simple system). I should have been clearer earlier sorry:
-there appears to be two issues, a low speed bog (6-8k) and high speed miss (11k+)
-the low end bog seems to have been an exhaust leak, now fixed
-the high speed misfires appear to be ignition related
I tried a different CDI (stock, RPM restricted) to check that it wasn't the CDI playing up, which made no difference to the low speed problems (I hadn't found the exhaust leak). I didn't check the high speed running, as I assumed that both problems were related.
I'm still waiting for my new none restricted CDI, which should come tomorrow. The only other possibilities are bad pickup, stator or the associated wiring, which can be eliminated with 10mins and a multi tester.
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Post by lshigham on Feb 14, 2011 16:25:43 GMT -5
Pickup checked, fine. Just need to check the rest of the stator.
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Post by lshigham on Feb 15, 2011 3:26:10 GMT -5
The rest of the stator is fine. It's putting out 110v AC to the coil.
All the connections to the coil/cdi have been checked, and are fine. Hmmm.
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Post by 190mech on Feb 15, 2011 5:17:48 GMT -5
Try dropping the needle one notch or a smaller main jet.A partially clogged air filter will give these symptoms too.I think other than the kill switch circuit,you've covered the ignition system..
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