If it doesn’t want to start when warm, give the tickler button a press.

 

Thanks for your response. Yeah. Tried that but absolutely no joy.

 

Hello everyone,
My bike is a 1957 T110 engine with Thunderbird iron head and 7:1 pistons and Monobloc carb in a duplex frame.
I have now finished my build and I really love the result.
She starts first or second kick everytime when cold and runs really well but, unfortunately, refuses to start when warm.
I suspect that I must fit a carb insulator gasket to help prevent vapour lock but there is insufficient space between the carb and the frame, so I think an angled manifold is my best solution.
I have 3 questions which I'm sure you can help with:
*Is this likely to help resolve my problem
*Does anyone know where I can find one (I am in France)?
*Also, are there any potential performance problems?

I can see an insulator in there, it is only about 3mm thick.

 

Hello everyone,
My bike is a 1957 T110 engine with Thunderbird iron head and 7:1 pistons and Monobloc carb in a duplex frame.
I have now finished my build and I really love the result.
She starts first or second kick everytime when cold and runs really well but, unfortunately, refuses to start when warm.
I suspect that I must fit a carb insulator gasket to help prevent vapour lock but there is insufficient space between the carb and the frame, so I think an angled manifold is my best solution.
I have 3 questions which I'm sure you can help with:
*Is this likely to help resolve my problem
*Does anyone know where I can find one (I am in France)?
*Also, are there any potential performance problems?

I can see an insulator in there, it is only about 3mm thick.

Thanks, but no, there is no insulator, only a gasket between the head and the funnelly scoop thingymajig.

 

Hi Eddie,

refuses to start when warm.

I can see an insulator in there, it is only about 3mm thick.

In addition to @Tritn Thrashr's advice, have you tried opening the throttle much wider than you do normally for a start? Reason I suggest this is ime could be heat from the stopped hot engine caused the carb. to vaporise more fuel; when you come to restart it again, the mixture is too rich.

Kicking over with WOT admits more air, more likely to match the otherwise over-rich mixture, it'll either start or a few kicks'll clear the over-rich mixture, you can revert to your more-normal procedure.

Hth?

Regards,

 

Hi Eddie,

refuses to start when warm.

I can see an insulator in there, it is only about 3mm thick.

In addition to @Tritn Thrashr's advice, have you tried opening the throttle much wider than you do normally for a start? Reason I suggest this is ime could be heat from the stopped hot engine caused the carb. to vaporise more fuel; when you come to restart it again, the mixture is too rich.

Kicking over with WOT admits more air, more likely to match the otherwise over-rich mixture, it'll either start or a few kicks'll clear the over-rich mixture, you can revert to your more-normal procedure.

Hth?

Regards,

Thanks for trying Mick but I have also tried that several times and no joy whatsoever.

 

Ermmm..Oops, Mick and Stewart and Thrasher.
Sorry but I mixed up the responses to your responses...?
I have had no joy with either possibility.
I'm hoping that I can instal a thick insulator (20mm?) but cannot do it without the angled manifold.

 

Bad starting when hot is also a classic sign of the condenser in the magneto failing.

 

Thanks, It has a new easycap installed.

 

Hi Eddie,

there is no insulator, only a gasket

hoping that I can instal a thick insulator (20mm?)

One that thick won't work any better than the 1/8" (~3 mm.) thick E2968 listed in the parts book - Triumph continue to fit E2968 or E4918 for another fourteen or fifteen years. Try one of them with the listed NA43A (various 71-nnnn numbers '73-on, Google finds 'em) thin gasket?

Hth.

Regards,

 

Hello Stuart,
Thanks for your advice. Good! The 1/8" spacer will fit without an angled manifold so I have ordered one and we will see how it goes.
One step at a time eh....

 

Are you getting spark from the magneto when the bike is warm?

 

Yes, it is not spark.

 

Famous last words.