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I bought an '80 special, a couple years ago, PO had let it sit for 15 yes, due to a skip on #3 cyl. After doing the usual checks, and cleaning the carbs, I was able to ride the bike, but it was smoking a lot from the right exhaust, come to find out, the #3 plug had been crossthreaded, and I think maybe some slivers of aluminum got on the piston, probably scarring the wall & rings, just wonder if I may be able to bore it out enough to get the scarring out? Any suggetions would be appreciated. Later 'Dog
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Have you checked the compression yet? While aluminum particles might have damaged the cylinder, make sure that's really your problem. If you do have a damaged bore, you'll need to either bore all, or replace the cylinders with a good used set. The latter will be the least expensive option....Fast, Cheap, Reliable... Pick any two
'78E original owner - resto project
'78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
'82 XJ rebuild project
'80SG restified, red SOLD
'79F parts...
'81H more parts...
Other current bikes:
'93 XL1200 Anniversary Sportster 85RWHP
'86 XL883/1200 Chopper
'82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
Cage: '13 Mustang GT/CS with a few 'custom' touches
Yep, can't leave nuthin' alone... -
If the bore isn't scored that bad, you might get away with just honing it and redoing the rings.
Compression test will tell a lot. If that cylinder hasn't been running in a while, the rings just might be 'stuck'. The 'little oil in the cylilnder' trick when checking compression will tell if that's the case.
I ended up replacing a piston in my 80G and put new rings on all 4 in one weekend (by myself) (it was a PITA, but I got thru it)
I got the NOS rings and 4 used pistons off Ebay and I still have 3 pistons left (just lying around waiting for someone who needs them)
Pulling the head off isn't that hard, for me, it was the jugs that were difficult.
With the head off, you can fix that plug hole and get a good look into that cylinder, then decide where to go from there.
Keep us up to date, we're all here to help each other.Hi, my name is George & I'm a twisty addict!
80G (Green paint(PO idea))
The Green Monster
K&N A/F, TC's fuse block, '81 oil cooler, TC's homemade 4-2 w/Mac Mufflers, Raptor 660 ACCT
Got him in '04.
bald tire & borrowing parts
80SG (Black w/red emblems & calipers)
Scarlet
K&N A/F, TC's fuse block, WJ5, Shoei bags, Raptor 660 ACCT.
Got her in '11
Ready for the twisties!
81H (previously CPMaynard's)
Hugo
Full Venturer, Indigo Blue with B/W painted tank.
Cold weather rideComment
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Thanks, will keep you up to date, gonna try to pull the head soon. Later 'DogComment
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Smoke
It is not strange for a motor that has sat for years to Smoke, from one or more cyls. I would squirt some PB oil in all the cyls and let it work on the rings over night, then ride it for a few miles and see if they break loose, just a thought
If you do need a complet tear down, what do you have to lose giving it a try, could seal up and save you lots of time and $$$$
Originally posted by scalded dog View Post1979 XS1100 Special (Mad Max, OEM) Current
1980 XS1100 Special
1990 V Max
1982 KZ750 LTD Twin
1986 700 FZR Yamaha Fazer (faster then expected)
1979 XS750 Special (my 1st Special)
1974 CB750-Four
Past/pres Car's
1961 Catalina 389/1970 Torino GT 351/1967GTO 12to1 comp./ Roller cam/ T-10/ 456 gear/Tri-power/1967 GTO 400, 1969 Camaro, 1968 Z28, 2001 BMW M Roadster 0 to 60 in 4.5 sec. Jaguar XK8Comment
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