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#703466 - 07/31/17 5:01 pm Exhaust Temp?  
Joined: Aug 2001
Posts: 276
Zimm Offline
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Zimm  Offline
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The land of pleasant living
My 54 A10 has just past 1,000 on a rebuilt engine from a reputable builder. Runs great.

One oddity I noticed was that one exhaust pipe was more discolored than the other from heat. Applying my magic ray gun laser thermometer, I found that the left pipe was about 210 F and the right about 170F with the engine warmed up for about 5 minutes or so.

Anyone think of a reason for this? Is it something to be concerned about? Timing is right and plug color is actually darker than I would like, making me think its running a bit rich, not lean.

Thanks

Zimm

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#703470 - 07/31/17 5:36 pm Re: Exhaust Temp? [Re: Zimm]  
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Andy Higham Online content
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Andy Higham  Online Content
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Bolton Lancs UK
Those look like pretty meaningless numbers, 170F is only 76C and 210F is only 99C,
The exhaust gas temperature is usually in the range 600C - 800C (1100f - 1450F)


1955 BSA B31 400cc "Stargazer"
1962 Greeves 200cc "Blue Meanie"
1962/67 Greeves 350cc
1967 Greeves 360cc Challenger
1984 Suzuki GSX1100 EFE "Sorcerers Apprentice"
GM500cc sprint/LSR bike "Deofol"
Jawa 500cc grasstrack
2003 Aprilia RSV Mille "Lo Stregone"
#703488 - 07/31/17 8:39 pm Re: Exhaust Temp? [Re: Zimm]  
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TT John Offline
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TT John  Offline

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Whitstable England
It's most likely the bias on the carb, I know at one time you could get a bias washer to fit between manifold & carb, if your carb has a 'O' ring try loosening one side & tightening up the other just to slew it round slightly..

#703494 - 07/31/17 9:05 pm Re: Exhaust Temp? [Re: TT John]  
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Peter Gascoigne Offline
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Peter Gascoigne  Offline
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Posts: 273
Southampton UK
Adjust the height of the carb slides so that the temperature is about the same, and the engine is idling correctly.


1971 BSA A65 Lightning "Bitsa"
1966 BSA A65 "Beezuki" with GT550 two-stroke engine
1974 Triumph T150 830cc
1975 Suzuki GT550
1975 Laverda 1000 3C
1986 Yamaha SRX 600
#703500 - 07/31/17 9:53 pm Re: Exhaust Temp? [Re: Zimm]  
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gavin eisler Offline
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gavin eisler  Offline
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argyll. scotland, uk
As you have found out, magic eye thermometers dont work on shiny surfaces, aim for the head casting beside the port for a more meaningful reading.

Might be subtle differences in ignition timing causing temp differences, or carb bias. A 54 A10 is a single carb, so adjusting slides plural isnt an option.

Last edited by gavin eisler; 07/31/17 9:54 pm.

71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
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The poster formerly known as Pod
#703706 - 08/02/17 6:57 pm Re: Exhaust Temp? [Re: gavin eisler]  
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Posts: 273
Peter Gascoigne Offline
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Peter Gascoigne  Offline
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Posts: 273
Southampton UK
You are right Gavin. I'm so used to two or three carbs, (even my SRX single lunger has two carbs), I'd forgotten there were bikes with only one carb!


1971 BSA A65 Lightning "Bitsa"
1966 BSA A65 "Beezuki" with GT550 two-stroke engine
1974 Triumph T150 830cc
1975 Suzuki GT550
1975 Laverda 1000 3C
1986 Yamaha SRX 600

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