MIK310

1988 XR80R advice

12 posts in this topic

Hey guys! I have been enjoying my 1988 XR80R for a few years now and it’s actaully the most ridden bike in my stable. I rescued it from a barn and brought it back to life. Sadly it’s really time for a motor refresh. I have the manual and the desire. But I wanted to see if you guys think I should do the rebuild on this old motor or get a new / used motor on eBay. I have no experience with the points ignition system. 

I am already down the rabbit hole on cost with this bike so I’m going to for any less expensive option. Any advice is appreciated, thank you in advance! 

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Points ignition system has nothing to do with the condition of the engine.
Small Honda XR engines can be in pretty sad shape and still run ok.

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I understand. But with limited knowledge of the points ignition system I’m not sure if I should do the rebuild myself. Motor is only making like 75 psi compression. I think it’s time. 

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2 hours ago, MIK310 said:

I understand. But with limited knowledge of the points ignition system I’m not sure if I should do the rebuild myself. Motor is only making like 75 psi compression. I think it’s time. 

 

Does it seem to be smoking or using much oil.........?  How long since it has had the valve lash checked.............and cam chain adjusted? :thinking:

Old School Al

Edited by Old School Al

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The motor is actually not smoking at all. Last I checked I had 70PSI in the motor. I checked the lash valves like five months ago and just gave them a very minor adjustment. Cam chain has not been adjusted since I have owned it. 

I will like to purchase a rebuild kit but I'm concerned about getting the correct one. Might you have any recommendation? 

 

Thank you in advance!

 

 

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No need for a rebuild, we have a 1985 XR100 here - doesn't smoke and runs like a champ.
Add some octane booster to a tank of gas and pull wheelies all over the neighborhood, go have fun.

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Its sound pretty bad inside the head. You can tell its not running well and I have a heck of time trying to fire it up cold. Last I ripped it it was hot starting just fine. Now it will not even hot start at all. We had to bump start it all last weekend and I know thats not the best procedure on these bikes. 

 

One thing I might have left out, this bike is running at 6800 ft in Big Bear CA. I have cleaned the carb but can you guys suggest the proper jet setting / info / or setup I need?

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Make sure the pilot jet is clear.
Bump starting will not hurt it at all.
These engines are almost indestructible.
If you do take it apart 99% chance it will never run again.
Do what you like...
You can easily buy a different XR for about $500.
Again just go enjoy it.
Try some power booster, you'll have fun.

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Posted (edited)

18 hours ago, MIK310 said:

Its sound pretty bad inside the head. You can tell its not running well and I have a heck of time trying to fire it up cold. Last I ripped it it was hot starting just fine. Now it will not even hot start at all. We had to bump start it all last weekend and I know thats not the best procedure on these bikes. 

 

One thing I might have left out, this bike is running at 6800 ft in Big Bear CA. I have cleaned the carb but can you guys suggest the proper jet setting / info / or setup I need?

 

18 hours ago, MIK310 said:

The motor is actually not smoking at all. Last I checked I had 70PSI in the motor. I checked the lash valves like five months ago and just gave them a very minor adjustment. Cam chain has not been adjusted since I have owned it. 

I will like to purchase a rebuild kit but I'm concerned about getting the correct one. Might you have any recommendation? 

 

Thank you in advance!

 

 

 

My recommendation would be a little detective work before I "purchased" anything..........;)   One would start by finding out why compression is low, and "its sounds pretty bad inside the head".  (I believe you're saying the top end is noisy?)  Start by checking to see how loose the cam chain is and checking cam timing.   Then at TDC on compression, back off the valve tappets and see if the cam and bearings are worn letting the cam flop around.  I'd look real close at these two things as they can shoot you down big time!:excuseme:  Also look at the cam lobes for scoring, wear or discoloration.

Old School Al

Edited by Old School Al

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"it sounds pretty bad inside the head"
I've had girlfriends that were like that but a rebuild would not have helped at all

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41 minutes ago, arthur6 said:

"it sounds pretty bad inside the head"
I've had girlfriends that were like that but a rebuild would not have helped at all

 

Yep..................got into your "octane booster" I'll bet! ;)  You've got to be more careful with that stuff.........!:excuseme:

Old School Al

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