GT250 only runs on choke

Need some help? Put your question up here. Many years of experience on the board to help you get up and running.

Moderators: oldjapanesebikes, H2RICK, diamondj, Suzsmokeyallan

User avatar
jabcb
Moto GP
Posts: 4240
Joined: Mon Dec 13, 2010 4:32 pm
Country: USA
Suzuki 2-Strokes: 69 T350 thru 75 GT750
Location: southwestern Pennsylvania

Re: GT250 only runs on choke

Post by jabcb »

Have not had this problem before.
My guess would be that you have a number of issues that interact to produce the rev problem.
BAS (Bike Acquisition Syndrome) - too many bikes but have room for more

Suzuki:
GT750 2x75
GT550 72 & 75
GT380 72
T500 69 project & 73 project
T350 69 & 71
Honda 85 CB650SC & 86 CB700SC
09 Triumph Bonneville SE
karl pa
To the on ramp
Posts: 490
Joined: Sat Sep 05, 2015 3:14 pm
Country: us
Suzuki 2-Strokes: GT
Location: southeast pa

Re: GT250 only runs on choke

Post by karl pa »

Kenny11 wrote: Wed Oct 28, 2020 2:17 am With Just a small twist on the throttle the revs go right up to the red line so I have to flick the off button, and restart it
Is this while riding,under load ? Did you check for air leaks on carbs and engine ?
If it runs away and won't shut off with ignition switch, put in gear and stall it with brake.
76 GT185
77 GT250
77 GT380
76 GT500
73 GT550
73 GT750
74 GT750
71 T250 scrambler
75 T500 cafe
GTandcbr
Yeah Man, the Interstate
Posts: 590
Joined: Tue Mar 10, 2015 12:35 pm
Country: WALES
Suzuki 2-Strokes: suzuki gt 550j
Location: Wales

Re: GT250 only runs on choke

Post by GTandcbr »

I know its been said but that seems to me like a sticking throttle valve. You say that you have checked that but it has happened to me at least twice. I found out that the little pin that makes sure the throttle valve faces the right way had come out and the valve turned around on itself and caused the symptoms you describe.
Look here
https://www.kettleclinic.co.uk/kcforum/ ... ttle+valve
98 carb Blackbird and GT550j
Kenny11
On the street
Posts: 13
Joined: Tue Jun 02, 2020 12:14 am
Country: United Kingdom
Suzuki 2-Strokes: Suzuki gt250 B 1977

Re: GT250 only runs on choke

Post by Kenny11 »

Thanks for your thoughts, that's given me a few things to look at :up:
alanr
To the on ramp
Posts: 260
Joined: Sat Jan 29, 2011 10:51 pm
Location: New Zealand

Re: GT250 only runs on choke

Post by alanr »

The best way to check carb slides for possible sticking is to take air cleaner off and do the ice cream stick trick.also fuel air screw to be one and a half turns out.
CB360T
TT250
quocle603
On the street
Posts: 13
Joined: Sun Mar 22, 2020 1:05 pm
Country: United States
Suzuki 2-Strokes: 1971 t500

Re: GT250 only runs on choke

Post by quocle603 »

slides are getting stuck. I had the same issue. Check the routing of your throttle cable to the splitter (oil, throttle). Lube the cables and try to make sure the slides do not get stuck and they are seated.
Kenny11
On the street
Posts: 13
Joined: Tue Jun 02, 2020 12:14 am
Country: United Kingdom
Suzuki 2-Strokes: Suzuki gt250 B 1977

Re: GT250 only runs on choke

Post by Kenny11 »

Hi folks, I'm out of action for a while, but when I get to the bottom of it I will post what the problem was.
Thanks for all your advice. :up:
Al
Kenny11
On the street
Posts: 13
Joined: Tue Jun 02, 2020 12:14 am
Country: United Kingdom
Suzuki 2-Strokes: Suzuki gt250 B 1977

Re: GT250 only runs on choke

Post by Kenny11 »

Okay so I removed the air filter and rubber manifold, looked into the carbs and they were coated in brown smeg :cry: removed the carbs and float bowls and they look like someone's taken a s**t in them. I thought I had cleaned the fuel tank enough but obviously not, so I've bought some kreem tank cleaner and liner, also getting the carbs ultrasonic cleaned,
So hopefully that'll do the trick :up:
Mark9
Still in the Driveway
Posts: 3
Joined: Mon Jun 07, 2021 3:24 pm
Country: England
Suzuki 2-Strokes: GT250 1976

Re: GT250 only runs on choke

Post by Mark9 »

Did it do the trick?
User avatar
Alan H
Moto GP
Posts: 3160
Joined: Thu Feb 16, 2012 11:50 am
Country: England
Suzuki 2-Strokes: 4 x GT550s - J, M, A, B.
Location: The Republic of South Yorkshire

Re: GT250 only runs on choke

Post by Alan H »

Last active March 2021, so the chance of a reply is minimal.
I never expect much from now posters who can't be bothered to say hello and do a basic intro of where they are from and a bit of biking experience.
Think of how stupid the average person is, then realise that half of them are more stupid than that.
dollydog
Yeah Man, the Interstate
Posts: 630
Joined: Fri Aug 11, 2017 7:09 am
Country: england
Suzuki 2-Strokes: several gt250 ramairs

Re: GT250 only runs on choke

Post by dollydog »

brown crap everywhere? that sounds like somebody has lined the inside of the fuel tank with original petseal and it's now leeching out and through the carbs and engine. i know this happens from experience, which is why i only ever use por15 nowadays. brilliant stuff :D
cheers, dd.
GTS250 road registered. TS250 engine, Ramair frame.
GT250 big bang road registered. Both pistons fire the same time. USD forks.
GT285 road registered. Overbored - 58mm and TS125 +2 pistons fitted.
GT10 road registered. '65 T10 engine, GT250 frame.
Post Reply