76 seahorse 20 misfiring

UK Vintage

Cadet
Joined
Aug 22, 2008
Messages
25
Hello,

I have an old seahorse 20 which misfires (and sometimes dies) until it has warmed up, after about 10 mins, then it runs well. It used to run smoother when cold until I took the crankcase apart and re-sealed it. So the obvious answer is the crankcase bolts are a bit loose, but if it were this I don't understand why it ran so well before because the crankcase was leaking from both sides. Has anyone got any ideas because it's driving me nuts!
 
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