Bike not starting after rebuild - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 5 (permalink) Old 07-26-2019, 01:35 AM Thread Starter
Grand Prix 125
Main Motorcycle: 2010 Triumph Bonneville
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Location: Melvern Square, Nova Scotia
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Bike not starting after rebuild

Engine was apart for a bottom end repair.

Good battery. Plugs are sparking. Fuel is pumping. Compression seems to be there as when plugs are pulled were getting puffs thru the plug hole.

Best we got was a couple backfires.

Tomorrow going to change the plugs. Any other wisdom?


Video:

https://youtu.be/K6k1pmH4usY
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post #2 of 5 (permalink) Old 07-26-2019, 08:50 AM
Grand Prix 125
Main Motorcycle: Daytona 955i
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Donít know your bike at all but those symptoms are almost invariably timing related. Could be valve or ignition, Iíd check ignition first as itís easier.
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post #3 of 5 (permalink) Old 07-26-2019, 11:28 AM Thread Starter
Grand Prix 125
Main Motorcycle: 2010 Triumph Bonneville
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Reply from my dad who did the rebuild:

"That's too bad. I don't clearly recall about the plugs, I think we had them out when we turned the engine over after putting the cams on and setting all of that timing up. They tell you to manually run it through 720 degrees. After that we rechecked that the timing marks on the cam sprockets were aligned when the timing mark on the alternator was aligned with the split on the crankcase which should be TDC. We didn't check compression but didn't remove the valves either. Two lifters on one cylinder, same side either exh on intake, fell out whike tipping the head over and I popped them back in. Otherwise we didn't mess with the valves."
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post #4 of 5 (permalink) Old 08-01-2019, 06:44 AM Thread Starter
Grand Prix 125
Main Motorcycle: 2010 Triumph Bonneville
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Quote:
Originally Posted by DonTheMan View Post
Don’t know your bike at all but those symptoms are almost invariably timing related. Could be valve or ignition, I’d check ignition first as it’s easier.
it was indeed timing. Running great now!
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post #5 of 5 (permalink) Old 08-06-2019, 03:05 PM
K.L
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Really great that you got this problem sorted out!

2005 Bonneville black
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