2005 sprint 1050 gets hot (very) quickly - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 15 (permalink) Old 10-06-2019, 07:19 AM Thread Starter
Grand Prix 125
Main Motorcycle: Sprint ST 1050
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2005 sprint 1050 gets hot (very) quickly

Is it normal for the 1050 engine to get to near the top of the temp gauge when riding around town traffic.

From just 5 mins of going around a town (2 mins of stopping for a traffic light) the temp gauge will be near the top of the scale.
The fan runs and can pull the temp down if left long enough, and once moving at normal speeds above 30 the temp comes back down to the normal operating range quickly so I know the radiator, thermostat and fan are all functional as they should be.

It just seems that my engine is really hot.

Oil is in spec for quantity and quality. Coolant is slightly overfilled but plenty of room for expansion.
Radiator gets warm both sides so no flow issues.

Just odd that the temp can rocket to nearly flashing by just being stopped at one set of traffic lights.

That's after normal riding - no thrashing, no hard riding, no build up of excess heat, just normal riding around for a few mins.

Lives in Cheshire. Works in Portsmouth region. Home at weekends.
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post #2 of 15 (permalink) Old 10-06-2019, 08:23 AM
Minitwins
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My 2006 does exactly the same thing! I’ve only owned the bike about 5 weeks & I've owned a lot of different bikes in the past & never generated heat like the Triumph does. I’m guessing it’s normal though as I’ve not had issues with the heat causing any mechanical failure etc. Just toasts my legs which isn’t such a bad thing in the UK weather climate.
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post #3 of 15 (permalink) Old 10-06-2019, 09:32 AM
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Quote:
Originally Posted by MRB3N View Post
My 2006 does exactly the same thing! I’ve only owned the bike about 5 weeks & I've owned a lot of different bikes in the past & never generated heat like the Triumph does. I’m guessing it’s normal though as I’ve not had issues with the heat causing any mechanical failure etc. Just toasts my legs which isn’t such a bad thing in the UK weather climate.
Think the heat your experiencing off the engine and heat represented by the temperature gauge aren’t related.
Original post was about temp gauge showing high reading. Should be mid way on gauge most stop and go driving so that needs looking into.
Your feeling heat because the fairing traps heat and directs it back onto your legs.
When I had a sprint, I just ignored it. Wear jeans or riding gear. It helps.
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post #4 of 15 (permalink) Old 10-06-2019, 11:57 AM
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Originally Posted by Cburt View Post
Quote:
Originally Posted by MRB3N View Post
My 2006 does exactly the same thing! I’ve only owned the bike about 5 weeks & I've owned a lot of different bikes in the past & never generated heat like the Triumph does. I’m guessing it’s normal though as I’ve not had issues with the heat causing any mechanical failure etc. Just toasts my legs which isn’t such a bad thing in the UK weather climate.
Think the heat your experiencing off the engine and heat represented by the temperature gauge aren’t related.
Original post was about temp gauge showing high reading. Should be mid way on gauge most stop and go driving so that needs looking into.
Your feeling heat because the fairing traps heat and directs it back onto your legs.
When I had a sprint, I just ignored it. Wear jeans or riding gear. It helps.
No I was also referring to the temp gauge too. Mine does the same. City riding in traffic does make the temp gauge rise a few bars over halfway & the fan kicks in.
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post #5 of 15 (permalink) Old 10-06-2019, 12:31 PM
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Quote:
Originally Posted by Max2ksr View Post
Is it normal for the 1050 engine to get to near the top of the temp gauge when riding around town traffic.

From just 5 mins of going around a town (2 mins of stopping for a traffic light) the temp gauge will be near the top of the scale.
The fan runs and can pull the temp down if left long enough, and once moving at normal speeds above 30 the temp comes back down to the normal operating range quickly so I know the radiator, thermostat and fan are all functional as they should be.

It just seems that my engine is really hot.

Oil is in spec for quantity and quality. Coolant is slightly overfilled but plenty of room for expansion.
Radiator gets warm both sides so no flow issues.

Just odd that the temp can rocket to nearly flashing by just being stopped at one set of traffic lights.

That's after normal riding - no thrashing, no hard riding, no build up of excess heat, just normal riding around for a few mins.
7 bars is not unusual.


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post #6 of 15 (permalink) Old 10-06-2019, 03:21 PM
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My '06 runs at 5 bars normally but if stuck behind slow moving traffic will rise to 6 bars. It drops quickly once I clear the traffic. On a hot day, say 25 - 30 C - hey that's hot for us - it will shoot to 7 bars sitting at a stop but quickly drops back to 5 once moving. So yes, yours appears to be running hotter than normal and should be investigated.

The highest I ever saw it was 8 bars when stuck behind slow traffic while on vacation. It was a high 30 C day and I pulled into the hotel parking lot and shut off the bike. Later noticed a pool under the bike where it had pissed coolant out the expansion tank overflow. I topped up the coolant and it was all good.
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post #7 of 15 (permalink) Old 10-06-2019, 06:34 PM
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Originally Posted by UlsterSpud View Post
My '06 runs at 5 bars normally but if stuck behind slow moving traffic will rise to 6 bars. It drops quickly once I clear the traffic. On a hot day, say 25 - 30 C - hey that's hot for us - it will shoot to 7 bars sitting at a stop but quickly drops back to 5 once moving. So yes, yours appears to be running hotter than normal and should be investigated.

The highest I ever saw it was 8 bars when stuck behind slow traffic while on vacation. It was a high 30 C day and I pulled into the hotel parking lot and shut off the bike. Later noticed a pool under the bike where it had pissed coolant out the expansion tank overflow. I topped up the coolant and it was all good.
I realise I’m a novice with the Sprint 1050 after only owning for 6 weeks, but I’ve done loads of reading. A lot of that on here & I’m sure I’ve read that the coolant has a tendency to find it’s own level & very rare is it at the max?
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post #8 of 15 (permalink) Old 10-07-2019, 02:45 AM Thread Starter
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Just for some clarity, mine will h
Readily go to 8 bars from 5 when sat at traffic lights for a few mins.

I suppose the custom map I'm running might not help, more idle fuel (even if it is miniscule) = more heat.

Ill keep an eye on her next time I go out now the weather is cooler in Cheshire.

Lives in Cheshire. Works in Portsmouth region. Home at weekends.
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post #9 of 15 (permalink) Old 10-07-2019, 03:25 AM
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actually - more idle fuel = less heat -
rich burn is cooller than lean burn -
but they run as lean as possible to pass emissions .....

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post #10 of 15 (permalink) Old 10-07-2019, 03:30 AM
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Quote:
Originally Posted by MRB3N View Post
I realise I’m a novice with the Sprint 1050 after only owning for 6 weeks, but I’ve done loads of reading. A lot of that on here & I’m sure I’ve read that the coolant has a tendency to find it’s own level & very rare is it at the max?
The normal level is a little above the min when cold.

The over-pressure valve in the radiator cap will open up when very hot (coolant expansion). Never happened to me though. The radiator cap and seat must be clean to avoid unwanted valve opening.


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