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Triumph heat problem #664043 08/15/16 7:31 pm
Joined: May 2006
Posts: 482
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68 royalstar tony Offline OP
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OK first some background. My buddy bought this bike as a T120.
It is a 69 T120 frame,68 TR6 motor with a T120 head. Carbs have been cleaned ( cannot verify condition). Carbs are 932s with 190 jets, needles same position. Boyer Ign ( we have switched wires from side to side,replaced plugs, no difference)6v coils in series. Timing 37deg with timing light engine reved. Compression 150psi per side. runs poorly, misses on left (drive) side. Temp reading with remote sensor( laser pointer thingie)after say 45/60 seconds right side 1890, left side 2300 pointing right at the pipes as they bend after coming out of the head temp rises accordingly if kept running, actually started to seize once before being shut off. Valve clearences good if not slightly wide. I /we are stuck. As far as I know only late timing,lean mixture and friction would cause this. Any thoughts would be appreciated. One last thins the oil return seems to put out a lot of oil (a jet) for 20 sec or so when started.Thanks for any help Tony.

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Re: Triumph heat problem [Re: 68 royalstar tony] #664050 08/15/16 8:29 pm
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ken sak Offline
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check intake leak with aerostart ,try richening on main jet left side
I have a zxr750 that has different jets on outer to inner jets

Re: Triumph heat problem [Re: ken sak] #664051 08/15/16 8:39 pm
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desco Online Happy
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What RPM? What throttle opening? What needle jet? What needle position?


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
Re: Triumph heat problem [Re: desco] #664067 08/16/16 12:48 am
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Excalibur Offline
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Sounds like this will turn out to be multiple problems.
The temperatures (f) quoted are more than red hot!
I think firstly, accurately verify the position of the timing mark.
The engine would have had 930's so your 932's will introduce more scope for confusion.

Re: Triumph heat problem [Re: 68 royalstar tony] #664069 08/16/16 1:21 am
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Nick Offline
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"Carbs have been cleaned".... means absolutely nothing unless you personally have verified that both pilot circuits are clear, jetting as per manual, float level, etc.

Left side pilot circuit probably plugged. Easy way to check: left-side idle speed should change noticeably when adjusting the air screw. If no change, plugged.
Won't idle well on left=plugged.

Pick up a .010" steel guitar string at music shop, insert from air-screw side and clean out pilot, then check by blowing air/cleaner through.

Have you ever seen/heard the bike run well. If not....expect the engine to be a mess. "Just rebuilt" is another term you don't want to hear unless you know the builder.

Still, the more mysterious the problem, usually the simpler the solution. Stick with the basics.


When people who should have known better cautioned me about the dangers of motorcycle racing, I always told them that a fear of death is nothing more than a fear of life in disguise.
Re: Triumph heat problem [Re: 68 royalstar tony] #664070 08/16/16 1:37 am
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triton thrasher Offline
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What you say about oil return sounds normal: solid return briefly, followed by aerated spurts.



Amateur Loctite enthusiast.

Moderated by  John Healy 

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