Project: Garage Find

[Sams Dad]

Ahhh Martin, now it makes sense!  This is what came with it so will blank off the spare stubs and connect as i thought.  I will check head first.  I will post how I get on 

[James P]

...so will blank off the spare stubs and connect as i thought.

There should be no need to blank off the heating circuit hose stubs on the carbs. The heating circuit only runs through a small part of each carb body and doesn't (or shouldn't!) interconnect with any fuel or air circuit. Therefore, the hose stubs can just be left 'open'...or can be pulled out or cut off if you don't intend to make use of them (I infer most people don't use them - I certainly don't). The less clutter, the better...and they weren't originally fitted to the 1KT-based TZR carbs.

I would be glad to hear from anyone who does use the carb heating circuits and considers them useful. I can't imagine they would be necessary, unless perhaps the engine is used in a snowmobile! Even then, considering that the carbs don't receive any heat until the engine has been running for a few minutes, it is hard to imagine that the heating circuits would be of much use. Still, I'm open to learning something new .

Regards,
James

[Martin77]

I've had carb icing on my TDR a few times, usually crisp cold winter air days. It chokes up the pilot air jet and makes rich as buggery! that was using RGV carbs... no heating circuits. Mind you, most TDR's/TZR's don't get ridden below 15'c these days, so yeah, most people wouldn't notice.

[James P]

I've had carb icing on my TDR a few times...

Thanks for the advice Martin. Maybe this problem appears on some models and not others...?

Bikes fitted with a carb heating circuit include the SDR (1987), the TDR (1988) and the R1-Z (1990). I'm not sure about the TZR 3MA (even after looking at the parts catalogue...so many hoses! ). Could it be that carb heating was judged unnecessary on bikes with full fairings? That doesn't explain why the TZR 3XV had heating circuits though...

Regards,
James

[Martin77]

The 3MA had them too... but yeah, I would still blank em off myself, just to remove some of the clutter!