1988 1340 evo backfirer
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6th Gear
Joined: Apr 2011
Posts: 10
Likes: 0
From: canada New-Brunswick
1988 1340 evo backfirer
Last year a broke a roller lifter. rip the cam, tappet block and 1 needle bearing went into gear pump. Disassemble the engine completely and install the same new cam ev3, new roller lifter, tappet block, gear pump and complete gasket set.
The bike run good until i rev it high. back firer and engine stall in fifth gear at 85mph. Almost no power like it's running on 1 cylinder. at 30 mph the second cylinder start on it's own compression. Lots of power. until i rev it high again. in neutral i rev the engine and make backfirers and before the engine die i ear a lot of air coming out of exhaust (straight pipe). Crank the engine and like i have no compression. I wait 30 seconds and run like new again.
I recheck pushrods adjustment, install a new shorty S&S carb. check the float in the carb and rejet . check the compression. check the amp and volt at coil,regulator,batterie and stator. Everything is in spec.
Don't know what's going on. anyone can help me with this ?
The bike run good until i rev it high. back firer and engine stall in fifth gear at 85mph. Almost no power like it's running on 1 cylinder. at 30 mph the second cylinder start on it's own compression. Lots of power. until i rev it high again. in neutral i rev the engine and make backfirers and before the engine die i ear a lot of air coming out of exhaust (straight pipe). Crank the engine and like i have no compression. I wait 30 seconds and run like new again.
I recheck pushrods adjustment, install a new shorty S&S carb. check the float in the carb and rejet . check the compression. check the amp and volt at coil,regulator,batterie and stator. Everything is in spec.
Don't know what's going on. anyone can help me with this ?
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Joined: Jul 2010
Posts: 853
Likes: 19
From: Melbourne
Serveral thoughts:
- Are you 100% sure you have that new cam in correctly and that its not offset somehow?
- I would check the cylinder compressions as well to make sure nothings buggered
- Double check the alignment of the cam, oil drive and brether gear in the cam chest.
- Are you 100% sure you have that new cam in correctly and that its not offset somehow?
- I would check the cylinder compressions as well to make sure nothings buggered
- Double check the alignment of the cam, oil drive and brether gear in the cam chest.
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