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  #1  
Old 03-16-2016, 08:06 PM
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Default My Cr500 is ill

     

I have a 1989 cr500, riding season is soon here and and my bike seems to be having some problems, overall power isn't much of what I expected even on pavement it doesn't even seem to really have all that much oomph to it, even to the point I got off and checked it was indeed a 500, speed is there but the wheel lifting power is not I guess.

Further more the bike seems to shut its self off after 30-40 mins of riding, next day it will fire right back up, I've had to push the thing for 3 miles down the road, when I got back and started looking at it, the plug cap was all cracked with the plug shorting out it appeared, the plug wire was also full of water, I've replaced the plug, cap and wire, the problem persists.

Bike will also be heavily build up after first starting up, you have to run it wide open a few gears for it to be good again

So my question is my power loss and the shutting off further electrical problems?

Last edited by Cr500allday; 03-16-2016 at 08:25 PM. Reason: Add addition
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Old 03-17-2016, 09:33 AM
cowboyona426's Avatar
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Could be electrical, could be fuel related too. Have you checked to see if the float valve in the carburetor is working correctly?
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Old 03-17-2016, 11:38 AM
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Carb seems to be working as it should, no vents or lines are obstructed as well as the gas tanks cap, jetting is

Needle: fourth clip
Main: 165
Pilot: 50
Air Screw: 2 turns out

Reeds have no cracks and seem to seat good as well
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Old 03-17-2016, 11:54 AM
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2 things to check.
1. Fuel vent lines and tank cap vent. If any are plugged or partially clogged you will have fuel starvation. The next time it dies, remove the gas cap and then try to restart.
2. The coil may be breaking down with heat. Do an ohms test on the coil.

Paw Paw
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Old 03-17-2016, 09:15 PM
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A slipping clutch will take the snap away from a good running engine. Also a lean running engine can sound like it is running good, but be low on power. Usually it will run at higher temperature when it is lean. It wouldn't hurt to check the float level like cowboy mentioned. Your jetting can be correct, but if the float level is off, it can still run lean or rich. Shutting down after a short period of time and not starting until it has cooled down is a symptom of a bad coil. Check the coil as pawpaw said.
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Old 03-18-2016, 04:36 AM
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you do run on the lean side on the pilot and main, should be around 170/55 & float level 16mm, have you tried to start it up after about 15minutes? after how much time usually starts up? could be just overheating, how do your spark plug looks like (lean/rich)?

apart from measuring the coil also measure your ignition stator and plug cap to be within spec do this with cold engine and with hot when the problem occurs.
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Old 03-18-2016, 08:16 AM
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Carb float is set to 16mm, will put the 170 back in, I'll have to order a 55 thou. Plug is on the lean side of things, I'm at sea level if that makes any difference.

I'll also need to pick up a ohm meter somewheres to test it

Even with fuel cap off it would not start last time, I tried for a good 10 minuets to kick it over last time, walked down the road pushing it for about 10 more minuets and still couldn't get it to start, I have tried to bump start as well down a good hill, but still no luck. It will fire right up later that evening or the next day in the second kick.

Air filter has no blockages, I do know the exhaust is leaking between the engine and pipe, it has some smoke coming out after starting up after sitting for winter
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Old 03-28-2016, 03:50 PM
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Have put the 170 main back in, still waiting on the 55 jet and the new coil to arrive should be here next week.

Instead of using the o-rings that came for the exhaust, is it possible to use silicon or something similar for a good seal between the pipe and cylinder?

As mentioned above, how do I check for a slipping clutch, is it possible to without removing much stuff, what kind of symptoms would it show besides less snap?
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Old 03-29-2016, 04:31 PM
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you should use the orings and some high temp copper sealant, plain sealant may leak at some point after a while.

slipping clutch, with 3-4-5th gear crack the throttle full open and if engine just revs high without rear tyre spinning or front wheel lifting above your head then yeah you know you have a clutch issue
ok now lets get serious, apart from these symptoms the clutch is also less snappy when releasing the clutch too but in general engine will rev without the motorbike accelerate.
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