Question about 2006 Triumph Bonneville T100

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Have a heavy rattle in bonnie 865 motor when hot only 4,300 klm

When my bike is used in realy hot weather i get a heavy rattle now and then. it seems to be from the top end. Have only done 4,300 klm

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  • whitehorse21 Jan 03, 2009

    Have always run on 91. yesterday was 37c. Anyway have just drained fuel and filled with 98.Today is slightly cooler but have just tested ,will moniter on a hot day

  • Dick
    Dick May 11, 2010

    That sound is most likely detonation. If it happens mostly under heavy load (higher gear, slow speed acceleration with a lot of throttle) detonation is very likely. Try a tank of premium fuel 91 octane (US) or higher, see if the problem goes away or is less.

  • Anonymous Mar 31, 2014

    Rattle from head

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Pinking is usually a sign of a low octane fuel, altitude or high temps that can sometimes be lessened by retarding the ignition timing a few degrees i.e. the plug sparks when the piston is closer to TDC. This is not always easily possible on modern bikes with the ignition advance/****** controlled by an ignitor box rather than a mechanical points type set-up.

Severe pinking for long periods can & will burn a hole through the piston crown. If a higher grade fuel is unavailable, try finding some sort of octane booster to add to the fuel (off road shop?).

Posted on Jan 03, 2009

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Does a 1992 polaris trail boss 250 2x4 need a cooling fan, once ido find a used one how do you wire it to this bike


A 250 probably doesnt need a cooling fan unless you're hauling heavy loads slowly in hot weather.

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My 2003 Electraglide seems really hot, thigh burning hot, riding back from Oregon yesterday in 90 degree weather. I could barely stand teh heat stopping at lights. The fuel had 10% ethanol in it. Woul


Hi Lorena, and the usual suspects are:
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2. Insufficient air flow over the engine.
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My Audi A4 2009 makes a rattling noise on cold starts which resolves in less than 30 seconds. Dealer says its an air pump. This doesn't seem correct. The noise comes from the front of the care. Does not...


READ THIS (happy ending so far...):
audi a4 2L turbo quattro, manual transmission with 98,000 KM. Perfect conditions, no oil leaks whatsoever.

Left the car off for two weeks in very cold weather (-10C down to -25C). When I restarted, it started immediately but with heavy rattling noise due to camshaft adjuster not getting enough oil pressure. After 3 minutes of warming up (outside temp.: -12C) at very low rpm (below 2,000rpm), I start moving the car. Still hearing heavy rattle noise. As soon as I pass 2,000 rpm, I get a scary red warning, low oil pressure. Turn off the engine immediately. In 1 minute, I re-start the car and the engine lights check ok, so I drive in first gear super slow (1,200rpm) hearing the same rattling noise. After another minute, finally the noise all the sudden disappears and the car starts running just fine.

Called Audi dealer and they told me that in extreme weather conditions, I should warm the engine for 10-15 minutes if necessary before start moving.
Take away: luckily, I didn't screw up the engine since I was using it at extremely low rpm (easy to do with clutch and manual transmission) until the oil reached full pressure. I am pretty sure now that the problem was leaving the car off for such a long time in freezing weather. All the oil flows back to the bottom, and when I restarted it, the cold oil with high viscosity took a long time to reach all the parts of the engine, specially the camshaft adjusters that are actuated by using oil pressure. Next day, the car started at -9C perfectly without making any noise (as usual). Basically, the longer you leave your audi in cold weather, the longer you might hear the rattling noise until the oil reach full pressure inside the engine. My car took 6 minutes to fix it after couple of weeks in cold weather. This makes sense to me; in fact, in the past I only heard the rattling noise after leaving the car off for a couple of days in the winter.
So far, this has had an happy ending....

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1 Answer

Rattle in front end since 20000 miles, now 99000 miles top of struts are tight, tie rods seem tight . What else could it be? Happens on bumps.


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Oil knock in hot weather


Does it knock hard or just rattle loud,? A lot of cars are noisy till the oil gets pumped up top. I hate to see people floor when they first start up, very bad idea, no oil up top, anyway, your oil weight goes by the outside temperature. If you live in Florida, it gets hot, I use 10w-40 year round, up north is a different story, 5w-30 in the winter would be fine, but summer time you could go heavier no problem. My brother uses straight 30 weight with a bottle of Marvel mystery oil as the 5th qt. The stuff works great. It cleans the inside of your engine like you wouldn't believe. He is one of these guys that takes the oil filters apart to check them out. Hope this helps.

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When the weather is warm...


Hot weather equals thinner oil equals rattles


If the engine is a high miler try using a multigrade with a higher viscosity or dump a can of STP or Wynns into the engine to bulk out the oil when it is hot

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1 Answer

RATTERLY SOUND FROM POWER VALVES OR EXHAUST CONTROL VALVE.


Gooped up power valve should not produce noise. One would think it the valve was that loose, or the spring were gone it would develope a lower, strange curved, punchy power band, but not make noise. Still, it wouldn't hurt to see which spring (or lack thereof) is in the valve.

The run-on, rough high RPM and noise would tend to make me think of a lean condition. How's the plug looking?

Apr 03, 2009 | 2002 KTM EXC 380

1 Answer

Starting issue


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