GT380 Carbs...

[Dbailey]

So tonight I decided to strip and check the carbs to see if I can find my running issues with a view to fitting some new jets and needle valves. Jets are main 80’s and pilot #25. Not blocked but whilst apart I’m tempted to replace them. I was going to get the parts from discount bike spares but it seems they have closed down... Any recommendations and whether I should go with original or pattern? Plus do I stay with the 80’s?

Thanks
Dave Bailey

[Harrymail]

Mikuni genuine jets can be bought from Motocarb. Very quick to post out and not expensive.

[barney01]

IMHO don't mess about with aftermarket jets. Buy genuine Mikuni. It's the only way to eliminate doubt if you are tackling running issues. As Harry says http://www.motocarb.com/mikuni-main-jets.html is in Liverpool.

[Dbailey]

Thanks guys..

Dave Bailey

[Gary66]

Did you get my PM Dave?

[Dbailey]

Gary.. yes apologies only logged on tonight..

I'll get things sorted over the weekend...

Thanks
Dave Bailey

[Gary66]

No problem

[Alan H]

If the bike was running reasonably well and the jets areb't worn, why mend summat wot int broke?

[Dbailey]

Ok so update from today’s efforts....

It seems that the pilot jet adjustment has no influence on the idle speed... My running issues are almost certainly down to carbs...

I have a flow meter and balanced the carbs at both 3000 rpm and 1500 rpm.

Adjusting the idle screw at 1000 rpm has no rpm change. I screwed both the right and left idle screws right in and it still ran with no rpm increase...

Dave B

[Alan H]

Running stationary and running on load (real life) are 2 different things. Get out on it and ride it. 70s carburation was approximate at best.