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750T Running Lean!

S

Sim0n

Just got it firing!
Joined
Dec 2, 2019
Messages
4
Location
Gloucestershire
Hi. I am struggling to get my 750T running. It starts and idles fine on new plugs but after a mile it cuts out, plugs are black and it fails to start.

I have replaced the following:
- All jets and carb gaskets
- Choke plunger

Any ideas would be greatly appreciated?

Thanks
 
The choke cables appear to be moving and it's set with enough clearance for the plunger to shut the choke off. I've put in a new choke plunger return spring as well.
Would there be a way to test this?
 
Also check the plunger. There is a rubber section and the bottom that may be damages causing excess fuel. I'm not familiar with a 750T, could it be an 850T? The 850T I had didn't have a cable control for the enriching jets, just individual flip levers at the carbs.
8294.jpg
 
Thanks John, I shall check the distance again. A new rubber insert came fitted in the new plunger so hopefully it shouldn't be that. The 750T was a UK only limited run. I believe its pretty rare so would love to get it running.
 
I would make sure float is set and not too high. 23.5mm-24.5 for the stock VHB
Make sure breather hole isn't plugged.
Could even be timing. Make sure advance works in distributor.
 
The breather in the fuel tank? I have not checked that!
Float heights and timing have been checked. The ignition advance is electronic as well which seems to be working OK.

Thanks again for the help.
 
Breather on side of carb. How about the oring on the choke jet? Seals fuel in float bowl, goes in little hole on corner of bowl. It'll run rich if not sealed. There is a thin one on the cap by the flipper too, it needs to seal also.
If you have a 60 pilot jet the mix screws should be around 1-1 1/2 turns out, smaller the jet=more turns.
 
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