NO's 2 &3 not firing

Message

skidz · #1 Unread post by **skidz** » Sat Sep 24, 2005 8:49 am

I have an '81 CB 750. Last week it suddenly lost alot of power. After looking into it I figured out the 2 & 3 don't seem to be firing as the pipes on those 2 never get hot.

I tried switching the coils around and got the same thing. I switched the spark units around too..same thing. New plugs made no difference either. Mechanical?

Any help is greatly appreciated as usual!

Thanks in advance!!!

niterider · #2 Unread post by **niterider** » Sat Sep 24, 2005 6:23 pm

Check the compression on those cylinders. The head gasket may have burned between the cylinders.

nitrus · #3 Unread post by **nitrus** » Sun Sep 25, 2005 4:35 pm

check for spark on those coils with the plugs out, if no spark, you may have an open somewhere.

skidz · #4 Unread post by **skidz** » Sun Sep 25, 2005 5:14 pm

O.K. I checked the spark and there is one...a little one. So I'll have to do that compression test ( gonna need the manual for that one ). Any other thoughts? Bugger is I really don't want to put much more into this bike as I'm buying a new one in the spring but I'd like to ride through the fall!