Other 1985 Honda Xr80 restoration thread!

[MrMan]

Howdy folks! After the sale of my 1981 yz60, my budged for project bikes has increased! (by increased, I mean I know have money for them ). I just picked up this 1985 honda xr80r today, it runs, but burns oil. The seller said it was the crank seals, but that wouldn’t make it smoke since it’s a 4-stroke, (He might’ve meant valve seals, which is probable). I checked the oil, and it is quite a bit overfilled, so here’s to hoping I won’t have to tear the top end apart!!!


Pics coming soon!

 

[SRAD97750]

Sick. Cant wait to see.
It could be valve seals or piston rings.
-BIG DAN

 

[MrMan]

Yup, My first guess was valve seals, since it has crazy good compression (170lb’s is what the seller said, and that does feel about right, I’m gonna have to check for myself though.

 

[MrMan]

I know it doesn’t look like much without the plastics on there, but it;s a sweet bike

 

[MrMan]

I did get a quick preview vid out: https://www.youtube.com/shorts/zOg1tk3GlsU

 

[MrMan]

I’d say it needs new valve seals, and the timing needs corrected, it backfires like crazy!

 

[MrMan]

I’d say it needs new valve seals, and the timing needs corrected, it backfires like crazy!

Or I just need to tune the carb

 

[MrMan]

My exhaust does leak where it meets the engine too….

 

[MrMan]

Got a vid of it ”running”. Runs terribly, if I wanted to shut the engine off, I just need to give it some throttle

XR80R Spitting Flames!! #honda #dirtbike #bikelife

Tried starting it today, still burns oil, and now it’s backfiring .

www.youtube.com

 

[MrMan]

Checked timing, and it was spot-on (I also checked the flywheel key). So my guess, is that the combination of burning oil, bad carb tuning, and a gummed up spark plug are the issues. (for the backfiring)

 

[MrMan]

Hmm, now it won’t start, fires sometimes, and sometimes poppies through the carb

 

[MrMan]

Hmm, now it won’t start, fires sometimes, and sometimes poppies through the carb

Whew! I had accidentally misadjusted the carb, runs good on choke (still smokes, just waiting on parts)

 

[MrMan]

Valve seals arrived today! (as well as air filter and a feeler guage set)

 

[MrMan]

Figured out why it backfires! (pic doesn’t do it justice)

 

[MrMan]

@SRAD97750 , should I attempt to clean the valve, or just buy some lapping compound and replace it?