Does anyone know what the problem is for my 1987 Honda CR 80r??

Question

I know its old so dont tell me its old. The top end is good the carberatour is good and the clip is in the right place. It shifts all right The only problem is that you can prolly ride it for about 20 mins unless you have it wide open the whole time. Once it dies on you it wont start again. I then check the spark plug and every time it is covered in oil. The gas and oil mixture is at the right ratio. I use the yamalube oil to mix. Also the air filter is clean. Any info would be great.

Answer 1

You are releasing the choke once it runs a bit, right? The gas/oil mix is 36 to 1?

If so, check the main jet to be sure it is tight and is the correct number. Make sure the plug is the correct heat range.

Answer 2

could be a couple of things... but I would do a compression check on it first off to ensure the top end is actually "good".

also depends on what type of riding you are doing??? if you are trail riding or not hitting up in the higher RPM ranges alot of the time, your oil mixture might be too rich. the recommended ratio of 32:1 or 36:1 is for racing levels which mean you are riding WFO most of the time... if you are not riding in the higher RPM range "most of the time", try mixing at 40:1 or even 50:1 (for trails riding and mid range alot).

if you are wet fouling the plug as you described, the compression test will verify that your top end is good but that is what I suspect is the issue and not to expensive on the little smoker to resolve.

another idea that is not that far fetched, is you need to repack your muffler. a friend of mine had an older KX80 that slobbered quite badly out the exhaust and finally got to a point of wet fouling quite regularly... the packing material in the muffler/spark arrestor was so saturated with unburned 2 stroke oil that the exhaust gas couldn't pass thru freely, causing back pressure and wet fouling....

Answer 3

Check the crankcase oil level after each ride.
The right crank seal might be leaking, letting crankcase oil into the fuel mixture, fouling the spark plug.
How do you know the top end is good?
Did you do a compression test? - 2 stroke engines can give inaccurate compression readings.
Did you recently change the piston & rings?
If so, did you check the piston to cylinder wall clearance and ring end gap, to see if the cylinder was worn past specs?

Answer 4

Your engine is cracked. And its bleeding on your plug, its obviously not a major one that leaks out your exhaust. But your engine needs some work.

Once everything in your engine settles down, it would start again right. After some work...

If you keep it up, you just might end up like me. Engine gave out during one of my runs over 45 miles per hour on a dirt road. Bike through itself into a off balance. I slid on the ground, while the engine burned through my right leg for 20 min.
not worth the risk, when you see those notice signs. You must take action

Answer 5

Do a compression check and take your coil off and have it tested. drain the oil and see if there are any metal shavings and also take the cap off the cylinder head and run your finger on the cylinder wall for metal shavings in there too. if you see a silver flakes in the carbon, Then get ready to tear the entire motor down(it's due for one). Good Luck.

Answer 6

If the plug is covered in oil, you probably have bad rings....Also, are you mixing by "eyeball", or accurately measuring?

Answer 7

sounds like you may have broke a ring or have a worn out piston and it is letting oil go past the rings.

Answer 8

the carbs may be gummed up and you may have to have them adjusted,,this has happened to me, it cost about ten dollars to have my mechanic fix it

Answer 9

check the reeds?