• Enter the March CB750 Supply gift certificate giveaway! It's easy... Click here, post something, and you're entered into the drawing!

78 hondamatic

hondamatic78

CB750 New member
Messages
3
Reaction score
0
Points
1
Location
Tacoma washington
I have a 78 hondamatic 750 the bike didn't run when I got it.i redid the carbs set the floats cleaned the points I think the timing is good but all it will do is puff and backfire maybe a vacuum leak idk any ideas will be appreciated
 
does it start or only puffs and backfires trying to start? start with starting fluid? verify fuel to all four carbs? Check compression? see if timing chain is loose, possible skip cam timing. Cant assume timing is good have to check it...could be a major cause of backfiring etc
 
You need to put a timing light on it and see where its at. Sounds like a timing issue to me. Also check make sure advancer is free and working. You need to verify that you are getting spark at the right cylinders at the right time. you can try swapping wires to the coils. If the coils are swapped it will not start and backfire.
 
Back
Top