Removing the Exhaust Decompression cam - Page 6 - Triumph Forum: Triumph Rat Motorcycle Forums
Thunderbird Cruiser Chat Cruiser chat for the the Thunderbird twin

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post #51 of 53 (permalink) Old 08-30-2019, 03:04 PM
Main Motorcycle: tbird
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Join Date: Oct 2014
Location: san jose
Posts: 350
Speaking of the decomp cams, i fear mine may have just broken off. In 75k miles mine has never had a hard time starting aside from one ECU adaption issue years ago. But this morning it wouldn't start till i gave it gas and once under way i heard what sounded like something being bounced around inside. Seemed to go away once i got 2-4 miles out but i'm worried i may have that issue. And at 75k miles my bike isn't even worth the cost of the repair, not a great place to be. Triumph has really dropped the ball on this model with this issue and the knock so many have plus the belt issues that plagued many of us. Makes me afraid to buy any new triumph that hasn't been in production for 5 years or more.
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post #52 of 53 (permalink) Old 08-30-2019, 07:02 PM
Grand Prix 125
Join Date: Aug 2018
Posts: 39
What a bummer. Broken parts bouncing around inside your engine! You can't ride anywhere with confidence those parts aren't going to cause the engine to lock up at the worst possible time and cause even more damage or a wreck.
I feel very fortunate to have a 2010 with 93k miles, no serious issues, 2 cross country trips, never left me stranded, and my valves haven't needed adjustment. I have checked my valves several times and pulling the plugs is not necessary because their is no compression when the engine RPM is less than 600. If you can lift the rear wheel off the ground, their is a relatively easy way to check if your de-compressors are working.
Pull the right side cover and water reservoir so you can access the front belt pulley. With the bike in gear you should be able to use a wrench on one of the pulley bolts and turn the engine over. Make sure you pull it in the forward direction only. I don't remember the torque on those bolts but the engine should turn over before the bolt moves because their is no compression.
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post #53 of 53 (permalink) Old 09-01-2019, 03:45 PM
Main Motorcycle: tbird
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Join Date: Oct 2014
Location: san jose
Posts: 350
Since i posted this it's been starting normally, no noise, and running as good as ever. May just have been a fluke so keeping fingers crossed.
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