ROUGH TICK OVER GT380

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arthur
Posts: 144
Joined: Wed Jun 17, 2020 8:55 pm

ROUGH TICK OVER GT380

Post by arthur »

I have tried setting the carbs up as per the book but I am having trouble ,
She will run and rev fine but tick over is another thing, anything below 1500 rpm she shakes like a Harley and the carbs vibrate and bounce on the rubbers.
HELP and or ADVICE needed ......AGAIN!
barney01
Posts: 3139
Joined: Wed Sep 26, 2012 7:33 pm
Location: Prestatyn.Wales

Re: ROUGH TICK OVER GT380

Post by barney01 »

Hi. The tickover is controlled by the pilot air screw and the pilot jet. The pilot jet passage also needs to be clean too. Make sure all the throttle valves are synchronised as well. Here is a link to the carb manual to help.
https://www.3cyl.com/mraxl/gt/manuals/s ... /cover.htm
The engine must be warmed up before adjustments are made
NO SMOKE .......NO POKE
arthur
Posts: 144
Joined: Wed Jun 17, 2020 8:55 pm

Re: ROUGH TICK OVER GT380

Post by arthur »

Hi Barney,
Thanks for your input once again I am in your debt!
I am pretty sure the slides are in sync, I have used the spacer /drill underneath each one method then watched as the cable pulled them up .
I will try blowing out the pilot jets and air screws see if it helps.
I did wonder if it may be timing related but she seems to go ok and I am loath to mess it up by fiddling :lol:
(Although isn't that what winter afternoons for?)
barney01
Posts: 3139
Joined: Wed Sep 26, 2012 7:33 pm
Location: Prestatyn.Wales

Re: ROUGH TICK OVER GT380

Post by barney01 »

I have attached a screenshot from Klemn vintage about tuning for idling. This may also help🙂
Attachments
Screenshot_20241022-180243.png
Screenshot_20241022-180243.png (208.12 KiB) Viewed 44 times
NO SMOKE .......NO POKE
arthur
Posts: 144
Joined: Wed Jun 17, 2020 8:55 pm

Re: ROUGH TICK OVER GT380

Post by arthur »

That's interesting reading.
On the up side I took the carbs off this afternoon to check thing over , the middle pilot jet was blocked but a winkle with a bit of wire and the air line sorted it out. I can't think where the muck came from she's got a in line filter fitted
I cleaned the other two whilst I was at it all back together now.
Getting good at this now 2 1/2 hours from putting her on the lift to rolling her out the door, its to dark and cold to start her tonight .
Tomorrow 's another day
barney01
Posts: 3139
Joined: Wed Sep 26, 2012 7:33 pm
Location: Prestatyn.Wales

Re: ROUGH TICK OVER GT380

Post by barney01 »

Great news!
NO SMOKE .......NO POKE
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