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nortyThu Jun-02-05 10:18 PM

  
"things to check on overheatin bike"


  

          

Just got my 1974 Mk II a running again, finally got the timing sorted out to 31 at 5000 with boyer ignition. Here is the issue, the bike is overheating badly. It gets so hot you can barely touch the plug (porcelin) because they will burn you. I have noticed the pipes are turning black on the outside from the first bend out of the exhast to just past the balance pipes. The oil lines are getting hot also, this would indicate that at least some oil is circulating. Ideas on what to check?

  

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geo46erFri Jun-03-05 09:51 PM
Member since Mar 18th 2009
16 posts
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#1. "RE: things to check on overheatin bike"
In response to Reply # 0


  

          

Hi Norty,
To tell you the truth I have never seen an engine that at normal operating temperatures I could grab the spark plugs, they get hot, that's normal. I have seen many engines started that have been sitting for a number of years. Typically they have a layer of oily dust on them that soon begins to smoke and stink, could this be all you are seeing. If you carbs are clean and adjusted and your timing correct, take it for a test ride.
I suppose if you are concerned you could borrow one of those hand held infared thermometers and compare your readings to readings from someone elses bike.
justa thought,
G.B.

G.B.

  

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nortySat Jun-04-05 10:50 AM

  
#2. "RE: things to check on overheatin bike"
In response to Reply # 1


  

          

Thanks. The thing that bothered me was the fact the carbs bowls were getting pretty hot to the touch, I dont remember that happening before.

Does anyone know what the normal operating temp of and 850 engine?

Thanks for the help

  

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HenrikSat Jun-04-05 12:41 PM

  
#3. "RE: things to check on overheatin bike"
In response to Reply # 2


  

          

I think you can find what you are looking for in this article
http://www.nortons.dk/doc/lubricants.pdf

B.R.
Henrik

  

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RohanSun Jun-05-05 08:29 PM

  
#4. "RE: things to check on overheatin bike"
In response to Reply # 3


  

          

Does your ignition system still use the mechanical advance retard unit ? It sounds like its sticking on either full advance or full retard. Tried strobing it - and giving it a rev to see the timing advance and return to retard.

Is oil returning back to the oil tank ? If you take the cap off while its running, you should see oil or at least oil froth returning back into the tank, probably in little bursts rather than a full stream. Is there sufficient oil in the tank ?

Oil analysis numbers are useless without comparison numbers for new oil included in the article..... Interesting but.

hopethishelps.

  

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nortyMon Jun-13-05 12:04 PM

  
#5. "RE: things to check on overheatin bike"
In response to Reply # 4


  

          

Solved

Found tons of gasoline in the oil, apparently a bad thing.

After changing oil again all is well, thanks for the input.

  

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