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Twins Talk Discussion of Hinckley Triumph Twin related matters and topics.

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Old 05-26-2011, 02:33 PM   #1 (permalink)
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Is valve clearance check necessary?

I've done all my own maintenance/inspections on my 2010 Bonneville. I now have 12,000 miles on it, and I'm wondering if it is necessary to do the engine valve clearance check. The bike runs great. No problems.

Might I be doing potential damage by not checking the valves?
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Old 05-26-2011, 02:38 PM   #2 (permalink)
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Triumph didn't put it in the service schedule for comedy value.

If valve clearances open up, you will hear a rattle. If they close, you won't hear anything until your valves burn out or worse.

Do it, or get it done, and have peace of mind for the next 12000.
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Old 05-26-2011, 06:17 PM   #3 (permalink)
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Thanks.

In my experience the is a lot of "recommended" service on all kinds of products that makes service departments money, but rarely are necessary. Yes, if perfect maintenance is the objective, that's one thing. However, as an ex car dealer I don't maintain my cars according to the manual, and they last 100's of thousands of miles.

I'll get to the valves soon.

Any other opinions?
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Old 05-26-2011, 06:50 PM   #4 (permalink)
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I checked my Bonneville at 12 and 24k miles and needed no adjustment. Checked my Thruxton at 12k and had to adjust four valves, which were only slightly out of spec.
So - my conclusions are that the valve clearances on these machines do not not change drastically, they probably are set at the factory not as exact as an owner may like, and that out of specfications by a small amount probably is not that bad [too tight a little worse than too loose, or so I have heard.
But then...I could be wrong...
You should check them - peace of mind is a truly beautiful condition.
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Old 05-26-2011, 08:13 PM   #5 (permalink)
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They are worth checking. I checked mine at 10,000 when I was replacing the cam cover gasket and they were all in spec, but some were close to the edge. Everybody's results seem to vary but it should be done.
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Old 05-26-2011, 08:43 PM   #6 (permalink)
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Quote:
Originally Posted by Ropeferry View Post
Thanks.

In my experience the is a lot of "recommended" service on all kinds of products that makes service departments money, but rarely are necessary. Yes, if perfect maintenance is the objective, that's one thing. However, as an ex car dealer I don't maintain my cars according to the manual, and they last 100's of thousands of miles.

I'll get to the valves soon.

Any other opinions?
Agreed ..... there's a lot of things in the schedule you might pass on, but valves are integral pieces, and IF they fail, it is expensive. Valve clearance checking goes back to as long as internal combustion engines have been pushing us down the highway, and unlike cars, most bikes, aside from HDs with hydraulic lifters, require that valves be looked at periodically, and re-shimmed if required.

(OK ---- you asked for the time, and we told you how to build the watch. Sorry!)

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Old 05-26-2011, 09:29 PM   #7 (permalink)
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I have done scheduled valve checks twice now and recorded the readings

I checked and didnt have to adjust after 12,000 miles and later at 24,000 the readings were very close to being the same, much to my surprise.

have since heard from others on this forum if you didnt have to adjust them after the initial check, chances are they will be fine for a long time, but I would never ignore regular scheduled valve clearance checks. potential for damage is too great

Oh, and managed to do it without causing the rocker cover gasket to leak. whoohoo!
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Old 05-26-2011, 09:43 PM   #8 (permalink)
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The 12K check is the most important, IMHO. They might not have been within specs when they left the factory. Four of the valves on my '03 were out of spec at 12K. At 24K, they measured exactly what they measured at 12K after shimming the four that were out of specs. Checking is easy and takes little time--even the dealership should only charge 1/2 hour if they don't need adjusting, IMHO.
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Old 05-26-2011, 10:39 PM   #9 (permalink)
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Hey thanks. It sounds a bit like the 12,000 check is a check on the factory. Seems reasonable to let the bike "settle in" and then set things right.

Appreciate the knowledgeable response.
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Old 05-27-2011, 05:11 AM   #10 (permalink)
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The valve check is not hard at all. At 12,000 miles, I found three intake valves needed thicker shims. I will certainly continue to check them; as I have on all my motorcycles.

If you do need to change shims, just keep everything in order and don't mix up the parts. Have paper, pencil, feeler gauges, micrometer, torque wrench, and a calculator on hand. And don't forget to lock the cam drive and backlash gear before loosening and removing the cams if you do need to change shims.

Remember that Triumph says if the valve guides or seats become worn, the head must be replaced -- no renewing guides or seats in our heads. That note should inspire us to keep on top of valve adjustment.

Regards, Chuck
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