140 is rather low for a cylinder that specs at 199 psi.
2nd gen specced out 40 psi less than 1st
Posts by SoakedKarma
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2nd gen specced out 40 psi less than 1st
a wet vs dry compression test can tell a lot..
squirt a tablespoon of 30w through the plug hole and check compression again..
higher wet figures are indicative of collapsed rings..
Leak down tester to test valve seal and percentage of leak past rings..
shade tree version.
Use a compressor that can regulate output pressure and plumb 5psi to 10psi into cylinder,, listen at exhaust and carb for hiss with cylinder at TDC when valves should be closed.. shouldn't hear anything..
hiss will at oil filler will always be heard, real loud indicates lots of blow-by.
squirt a tablespoon of 30w through the plug hole and check compression again..
higher wet figures are indicative of collapsed rings..
Leak down tester to test valve seal and percentage of leak past rings..
shade tree version.
Use a compressor that can regulate output pressure and plumb 5psi to 10psi into cylinder,, listen at exhaust and carb for hiss with cylinder at TDC when valves should be closed.. shouldn't hear anything..
hiss will at oil filler will always be heard, real loud indicates lots of blow-by.
proper valve job would entail grinding seat and replacement valve to match..
at the very least knurling valve guides or replacing them..
Rings could be as simple as freeing up collapsed rings and honing cylinders or replacing with new rings & pistons if they are scored.
Both are major procedures..
at the very least knurling valve guides or replacing them..
Rings could be as simple as freeing up collapsed rings and honing cylinders or replacing with new rings & pistons if they are scored.
Both are major procedures..
Upon tear down you may find rings collapsed and stuck in piston grooves which need to be cleaned out..
Honing cylinders isn't difficult, nor is cleaning caked on carbon out of piston groove with a broken piston ring.
of course pistons could be riding against cylinder wall scoring both..
at this point without further leak down testing as well as internal visual inspection everything is supposition.
Or ride and enjoy, come winter take top end off and have independent shop or MC machinist you're going to find during this summer do machine work that may be needed.. Keep your eye out for good used P&C on ePay
Honing cylinders isn't difficult, nor is cleaning caked on carbon out of piston groove with a broken piston ring.
of course pistons could be riding against cylinder wall scoring both..
at this point without further leak down testing as well as internal visual inspection everything is supposition.
Or ride and enjoy, come winter take top end off and have independent shop or MC machinist you're going to find during this summer do machine work that may be needed.. Keep your eye out for good used P&C on ePay
basically 1st and 2nd gen Rebel valve specs are the same except Valve seat width is wider on 1st gen..
part numbers are different and 1st gen intake valve is listed as Unavailable
does your leak down test indicate valves are loosing compression?
part numbers are different and 1st gen intake valve is listed as Unavailable
does your leak down test indicate valves are loosing compression?
I really doubt the valves are burnt.. Don't know why you feel they are without proof..
There are Used and New P&C sets for sale on eBay which will likely solve your compression problems.
There are Used and New P&C sets for sale on eBay which will likely solve your compression problems.
imho you should disassemble the engine first to discover what is needed..
1st generation has different cam, lobes were ground differently and slightly higher rise which I believe is responsible for increased horse power over 2nd gen Rebel.. 2nd gen head is a downgrade
Differences in cylinders that I have noted 1st gen used 4 dowel pins and 3 stud gaskets
www.partzilla.com
While the 2nd gen cylinder used only 2 dowel pins and no stud gaskets..
www.partzilla.com
1st gen members who have ordered Head Gaskets have received 2nd gen gaskets.
Two of the head gasket holes are too small to use 2 of the dowel pins which can be discarded..
unproven Big Bore cylinder may be a waste of money and you won't hear from Elchico as he was able to get himself banned within 3 weeks of joining..
1st generation has different cam, lobes were ground differently and slightly higher rise which I believe is responsible for increased horse power over 2nd gen Rebel.. 2nd gen head is a downgrade
Differences in cylinders that I have noted 1st gen used 4 dowel pins and 3 stud gaskets
Honda Motorcycle 1987 OEM Parts Diagram for Cylinder | Partzilla.com
Buy OEM Parts for Honda Motorcycle 1987 Cylinder Diagram
www.partzilla.com
While the 2nd gen cylinder used only 2 dowel pins and no stud gaskets..
Honda Motorcycle 1996 OEM Parts Diagram for Cylinder | Partzilla.com
Buy OEM Parts for Honda Motorcycle 1996 Cylinder Diagram
www.partzilla.com
1st gen members who have ordered Head Gaskets have received 2nd gen gaskets.
Two of the head gasket holes are too small to use 2 of the dowel pins which can be discarded..
unproven Big Bore cylinder may be a waste of money and you won't hear from Elchico as he was able to get himself banned within 3 weeks of joining..
If you have sealed exhaust leak the you can only damage the pistons and cylinders while riding.
you can replace P&C with new 2nd gen style or used 1st gen P&C for less than $100
so ride til it quits if you wish.. keep your eye out for deals on cylinder and pistons while you ride..
you can replace P&C with new 2nd gen style or used 1st gen P&C for less than $100
so ride til it quits if you wish.. keep your eye out for deals on cylinder and pistons while you ride..
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