Bonnie overheating w/o reason - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 14 (permalink) Old 08-22-2019, 10:25 AM Thread Starter
Minitwins
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Bonnie overheating w/o reason

Hi! I found a few posts about overheating but didn't find my situation/ or situation where bike hot but working

Riding on Bonnie 2005 carbs. Few days ago it starts overheating after 2-3 km of riding. Very-very hot, but still working (as hot that i burn my leg through moto jeans, i't much hotter than has to be). Valves adjustment not needed - everything by manual, no problems with idle, engine start (hot or cold) or any strange things with this. Engine works like a Swiss clock. But it becomes hot as hell in a 5 minutes of riding. Oil was changed, carbs cleaned and synchronized, gas mix seems ok (accordingly to sparks color) but it's still hot.

Any ideas where to check?
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post #2 of 14 (permalink) Old 08-22-2019, 10:43 AM
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These engines are mainly oil cooled.

Check for a blocked oil cooler fins, or maybe its the plastic gear on the oil cooler pump has broken
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post #3 of 14 (permalink) Old 08-22-2019, 10:56 AM Thread Starter
Minitwins
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Sorry for stupid question but where is this plastic gear located? As far as i know there is no any pump or something like this in fins. Also oil cooler becomes hot after engine starts. Based on this, I make a guess that it's work properly. But if there can be some plastic parts inside, than i have to check it.
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post #4 of 14 (permalink) Old 08-23-2019, 12:32 AM
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Originally Posted by Pingwinst View Post
Sorry for stupid question but where is this plastic gear located?

Left side of engine, behind clutch assembly like this (clutch has been removed in this photo), but if you feel the oil cooler radiator becoming hot after a few minutes of running the chances are that the gears are OK, I'd do as Mike suggests and check the fins and air passages of the radiator first of all:


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post #5 of 14 (permalink) Old 08-23-2019, 03:09 AM Thread Starter
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Originally Posted by Forchetto View Post
Left side of engine, behind clutch assembly like this (clutch has been removed in this photo), but if you feel the oil cooler radiator becoming hot after a few minutes of running the chances are that the gears are OK, I'd do as Mike suggests and check the fins and air passages of the radiator first of all:




Thanks will try it on this holidays. How can I check radiator fins? Just unmount it and wash with cleaner? Air passages better to wash and dry with compressed air or something like this?
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post #6 of 14 (permalink) Old 08-23-2019, 10:43 AM
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It's the "air passages" that get clogged up with dead flies etc that can cause over heating, yes just wash or use compressed air to blow the debris out, be careful not to damage the cooler fins.... But I suspect there is more of a problem than a clogged cooler, my bike needs 10-15 minutes of riding just to get up to normal operating temp.

Last edited by mike-tt special; 08-23-2019 at 06:03 PM. Reason: the EU is a socialist regime.....socialism has proven not to work by the Russians, Chinese etc ;)
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post #7 of 14 (permalink) Old 08-23-2019, 12:32 PM
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If you find nothing blocking air flow, and all other things seem OK, you might look in to your ignition. Your igniter controls ignition timing. My line of thought is too much ignition advance could make it run hot. I know it is a bit of a long shot. You would probably have to take it in to the dealer to get it checked. You seemed to have checked out most everything else though. These things do not happen w/o reason. ...J.D.

BTW: Please let us know what you find so we all can learn.

Last edited by Wire-Wheels; 08-23-2019 at 06:10 PM.
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post #8 of 14 (permalink) Old 08-24-2019, 04:20 AM
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Sure your fuel/air mix is not too lean?
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post #9 of 14 (permalink) Old 08-24-2019, 04:27 PM
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OK, back to basics. Why do you think it's overheating? Do you have any temp measurements such as with an IR thermometer? Just because you think it's hot doesn't necessarily mean that it is "overheating." "Hot" for you doesn't necessarily mean "hot" for the engine. Before launching on a quest to fix a "problem" maybe some temperature measurements should be made just to see the scope of the problem. There are lots of things that can lead to overheating on an engine--lean mix, retarded spark, failing bearings, failing oil pump, scored piston/bore, blocked cylinder/head fins, blocked oil cooler, etc. But without some information about how hot it actually is, you may just be chasing phantoms.
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post #10 of 14 (permalink) Old 08-25-2019, 06:44 AM Thread Starter
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Don't have measures of temp but totally sure thet it's overheating. Previously it works normally. Now I can't ride because it burns my legs. This is not normal. I mean I see normal working tempsreture but this is too hot
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