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Running Hot
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beemeerr11
Flying Brick Rider


Joined: 05 Mar 2006
Posts: 150

PostPosted: Wed Feb 27, 2019 4:49 pm    Post subject: Reply with quote

Thanks for the reply Duck, the gauge has been accurate for the last 19 years, so I have no doubt that it is correct,e.g the fan comes on when its into the RED,
Yes the bike is worse at low speed and better at high, but still runs hot though at higher speed, the radiator place told me the radiator you cannot pull apart so there is a possibility the radiator could be the issue. (even though they said it was OK)
I have a spare bike 1984 K100, will that radiator fit in the 1100 as the last process of elimination?
Cheers

Lou
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Flying Duck
PsyKotic Waterfowl


Joined: 27 Jan 2005
Posts: 9556
Location: Bumf***, WA

PostPosted: Wed Feb 27, 2019 5:36 pm    Post subject: Reply with quote

The reading from the temp gauge really doesn't matter. The sensor it uses only outputs to the gauge. On one of my K1100s I plan to replace the temp gauge with an oil pressure gauge when my garage heats up a little more next month. I might actually look at that.

I'd suspect the REAL temp sensor at the output in the front of the head might be the issue. For starters I would test the resistance between Motronic pins 7 & 14 at room temperature when the engine is cool and see if that's working. (See the table I posted on the previous page.) Next you could pull it out and test the resistance in boiling water to see if it gives the correct resistance for 100C.

Is the temp warning light in the cluster coming on? That's triggered by the Motronic.
_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
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beemeerr11
Flying Brick Rider


Joined: 05 Mar 2006
Posts: 150

PostPosted: Wed Mar 06, 2019 4:27 pm    Post subject: Reply with quote

No the temp light has only ever come on when I had a thermo fan fail, I'm going to replace the radiator from the k100 and put it in the 1100, according to Max's BMW parts fiche, they are the same part numbers.
I'll report back with an update?
Cheers
Lou
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beemeerr11
Flying Brick Rider


Joined: 05 Mar 2006
Posts: 150

PostPosted: Tue Mar 12, 2019 4:33 pm    Post subject: Reply with quote

So I removed the new thermostat and took the bike for a ride, the temp gauge showed what would have been a normal temp, before this overheating issue started, sitting in about 1/4 between the blue and the middle of the gauge, although riding slower the gauge did creep up, I did have the radiator looked at by a radiator specialist and advised me that it was OK, I'm starting to think otherwise, that maybe the radiator is the culprit, although I can still get 3 litres of coolant/water 50/50 mix into the radiator, would that negate a blockage?
Cheers
Lou
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Scott_Anderson
Site Admin


Joined: 05 Sep 2006
Posts: 2966
Location: Central Iowa, USA

PostPosted: Tue Mar 12, 2019 10:40 pm    Post subject: Reply with quote

beemeerr11 wrote:
.....although I can still get 3 litres of coolant/water 50/50 mix into the radiator, would that negate a blockage?
Cheers
Lou


Not necessarily, as the water will fill from both sides of a blockage, it just can't flow thru one.
Regarding water flow, it will flow thru the path of least resistance, so if you have the thermostat out, the path of least resistance will be thru the bypass hose, not the radiator.
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1997 K1100LT 0302488
1995 K1100LT 0302044
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"One who does not ask questions is ashamed to learn" Danish proverb
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beemeerr11
Flying Brick Rider


Joined: 05 Mar 2006
Posts: 150

PostPosted: Wed Mar 13, 2019 6:13 am    Post subject: Reply with quote

Update on my post from yesterday, I rode the bike to work this morning, 16 Km's about 20 minutes 12 degrees Celsius , there was some traffic and slow riding in the last few minutes and it caused the Thermo fan to come on when the gauge went into the red?????

Cheers
Lou
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Flying Duck
PsyKotic Waterfowl


Joined: 27 Jan 2005
Posts: 9556
Location: Bumf***, WA

PostPosted: Wed Mar 13, 2019 9:46 am    Post subject: Reply with quote

Have you checked the resistance of the temp sensor yet? (So my post on the prior page.)
_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE
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