Thanks Alan....
Dave Bailey
GT380 Carbs...
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- Posts: 12
- Joined: Sat Apr 06, 2019 7:26 pm
Re: GT380 Carbs...
HI All,
I have a '74 GT380M which was extensively restored before I got it, and i've addressed most of the leftover issues now. However, I am convinced that its remaining poor throttle response off idle is due to the pilot jet bypass issues described by previous posts here. Once you get the throttle open a bit it all works well, so the mains are surely OK...
So I'm going in with carb cleaner and tiny jet cleaner rods as suggested above.
Any advice on the best way to get the carbs off? It all looks vey cramped! Presume remove the airbox first?
Jon
I have a '74 GT380M which was extensively restored before I got it, and i've addressed most of the leftover issues now. However, I am convinced that its remaining poor throttle response off idle is due to the pilot jet bypass issues described by previous posts here. Once you get the throttle open a bit it all works well, so the mains are surely OK...
So I'm going in with carb cleaner and tiny jet cleaner rods as suggested above.
Any advice on the best way to get the carbs off? It all looks vey cramped! Presume remove the airbox first?
Jon
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- Posts: 3118
- Joined: Wed Sep 26, 2012 7:33 pm
- Location: Prestatyn.Wales
Re: GT380 Carbs...
Hi
Yes the carbs are suspended between the cylinder rubbers and the airbox. Ive given you a link to the carb manual to help.
http://www.3cyl.com/mraxl/gt/manuals/su ... /cover.htm
Yes the carbs are suspended between the cylinder rubbers and the airbox. Ive given you a link to the carb manual to help.
http://www.3cyl.com/mraxl/gt/manuals/su ... /cover.htm
NO SMOKE .......NO POKE
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- Posts: 12
- Joined: Sat Apr 06, 2019 7:26 pm
Re: GT380 Carbs...
Had the carbs off and found that the middle one was WAY out of synch with the user two. There was about 5mm of free play in the linkage so it was always going to be an issue...
Rebuilt all carbs using Keyster kits, balance/synch and it's all MUCH better! Just need to finish running in - up to 350 miles now so I let it go to 5K a couple of times, and it starting to sound nice and "edgy" and feel really good.
Aah, two strokes - doncha love 'em?
Jonny
Rebuilt all carbs using Keyster kits, balance/synch and it's all MUCH better! Just need to finish running in - up to 350 miles now so I let it go to 5K a couple of times, and it starting to sound nice and "edgy" and feel really good.
Aah, two strokes - doncha love 'em?
Jonny
- Alan H
- Posts: 12104
- Joined: Fri Aug 05, 2011 6:38 am
- Location: Wombwell, Republic of South Yorkshire
Re: GT380 Carbs...
It would have been even better if you'd used genuine Mikuni.JonnyAstro wrote: Rebuilt all carbs using Keyster kits, balance/synch and it's all MUCH better!
Proof that four strokes are over complicated
- Gary66
- Posts: 710
- Joined: Sun Jan 05, 2014 10:53 am
Re: GT380 Carbs...
I got my carb kits from Cruzin Image in Japan, no complaints at all and have had many other bits including pistons, great service and products!