Thruxton TEC Cam Break in/ bedding in period - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 35 (permalink) Old 08-15-2019, 10:37 PM Thread Starter
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Thruxton TEC Cam Break in/ bedding in period

Hi, I have fitted the TEC "Race 303" cam to my bike (Thruxton S). Now i am concerned about the apparent advice given by TEC that theses cams need about 500 kms to "break in or bed in" - I have googled the **** out of this subject and it appears proper way to "run in" cams is to keep them operating at 2000rpm for thirty minutes after initial start up and not to let the motor idle. Now this second method (30 minutes) makes more sense to me. The rest of the engine is already bedded in, we got roller rockers, there are no sharp edges to be knocked of like rings have.. can anybody else give me their view on the matter.

2016 Triumph Street Twin - Ace cafe dress up - Techbikeparts Cam and Xpipe (has gone to a new home) =>Triumph Thruxton S Jet Black 2017 - Meerkat X pipe - De snork - TEC 303 Cam
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post #2 of 35 (permalink) Old 08-16-2019, 01:01 AM
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I was told by my installer(also happens to be Triumph dealer)that I should run it in exactly as the new bike was run in.I am not saying he is correct,but I followed his instructions .Very painful for the first 500 km ,and got progressively easier.
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post #3 of 35 (permalink) Old 08-16-2019, 04:48 AM
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you wont bed it in properly after 30 min of holding the throttle, as advised, run it in as if it were a new bike for at least 200 miles before you start having fun with it
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post #4 of 35 (permalink) Old 08-16-2019, 06:28 AM
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Running in these cams makes no sense to me and why would performance improve after ‘bedding’ them in?

How about 7000rpm for 5 minutes?
7200 for 3?
Pick a number?
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Last edited by Tricolour; 08-16-2019 at 06:46 AM.
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post #5 of 35 (permalink) Old 08-16-2019, 07:54 AM
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Didn’t run mine in. Just fitted it and rode it. I think it’s George just ‘covering his arse’. Whatever you decide, enjoy.
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post #6 of 35 (permalink) Old 08-16-2019, 09:40 AM
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We’ll definitely expect to see your ride report soon as well.
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post #7 of 35 (permalink) Old 08-16-2019, 12:02 PM
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Quote:
Originally Posted by Simon64ds View Post
Didn’t run mine in. Just fitted it and rode it. I think it’s George just ‘covering his arse’. Whatever you decide, enjoy.
I agree you should be able to just run it as normal straight away, only reason I can think of for running in a new cam is that if your cam has higher lift the valve springs could benefit from slowly adjusting to the new lift. dont want to stress them out with high revs when theyve not been opening to the higher lift before
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post #8 of 35 (permalink) Old 08-16-2019, 02:43 PM
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I was thinking of getting that Cam so let us know your thoughts on it when you finally get so have some fun with it. In terms of a break in, do the 500mi like triumph wanted you to do when it was brand new. I think it was like no higher than 4000rpm For 300mi then 5000rpm for 100mi and 5500rpm for 100mi. You can check the owners manual or go to the dealer and look at the sticker on the fuel tank on the bikes in the show room.
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post #9 of 35 (permalink) Old 08-16-2019, 02:44 PM
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don't forget to change your oil after 500mi in case any small flaking happened during break it.
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post #10 of 35 (permalink) Old 08-16-2019, 09:28 PM
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Just ride it and don't labour the motor as that will do more damage, any new parts need to bed in but sitting on one rev for 30 minutes be real, just take it easy with it for the first 100 miles or so and then have some fun with it and enjoy, if its a well built cam you won't have any troubles with it, but like they say they are covering their ar.e and if anything did go wrong with their cams they will try to blame you for not following their instructions instead of a faulty product, its the oldest trick in the book, and how are you going to bed it in if you just ***** foot around with it.
If its been heat treated and harden right there be no problems with it, but there are a lot of soft cams floating around in the market place and only time will tell for sure if its been done right.

Ashley
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