TB sync issue

[glang]

Gaz is it possible that the high reading is the correct one and the other the problem? If this was the case then low vacuum could be due to air leaks, poor engine valve adjustment, worn engine etc

[Gaz.sv650]

Originally Posted by glang

Gaz is it possible that the high reading is the correct one and the other the problem? If this was the case then low vacuum could be due to air leaks, poor engine valve adjustment, worn engine etc

I'm not sure, the high reading is off the scale so that is never right at 1200rpm never used to be like that anyway.
The valves are due a check now on 30k they were well within spec at 20k.

Air leak would cause high revs?
The engine is using very little oil so hoping it's not worn.

[Bibio]

check the rear TB is in and on its inlet rubber properly and the clip is tightened up.

IIR there are two vacuum spigots on one of the TB's and i think its the rear or maybe not. make sure that the cap is not perished.

[Gaz.sv650]

Originally Posted by Bibio

check the rear TB is in and on its inlet rubber properly and the clip is tightened up.

IIR there are two vacuum spigots on one of the TB's and i think its the rear or maybe not. make sure that the cap is not perished.

Will try that a report back on the weekend.
Cheers for the help so far

[glang]

difficult to see what can give a high vacuum. I would have thought any air leak would reduce the vacuum and the only possible explanation is a restriction somewhere on the inlet side of the tapping point. For me an STV thats too closed would fit the bill perfectly....