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Won't start
Posted: Sun Oct 25, 2015 5:34 pm
by LI150
Just built a gt186 engine and I can't get it to start.
I have a spark and I'm using a 30mm dellorto. It appears if I don't have fuel getting through.
I have fuel getting into the fuel bowl but the plug is dry.
Checked jets aren't blocked all seems good
I looked at the piston to make sure that was right way with the 2 windows facing the inlet side and it is
Have poured fuel in the manifold and it fires
I'm at a loss help
Re: Won't start
Posted: Sun Oct 25, 2015 5:45 pm
by mick1
Stripping and cleaning carb' would be the first port of call but I've just had a similar problem and it was dodgy fuel in the tank. Somehow water had got in and it just wouldn't fire except when fuel (from a separate supply) was poured through carb mouth.
Re: Won't start
Posted: Sun Oct 25, 2015 5:52 pm
by LI150
I have a new carb I have checked and double checked still at a loss
Re: Won't start
Posted: Sun Oct 25, 2015 6:29 pm
by Mr G in NYC
Have you checked the fuel tap for blockage in the filter inside the tank ?
also checked the fuel flow ? Fast flow tap ? G.
Re: Won't start
Posted: Sun Oct 25, 2015 6:35 pm
by LI150
Yep checked all that.
Just had a thought I'm using the gt head which allows usuage of a normal or centre plug positions.
I can't remember if I checked the plug stop thing was tight in. I presume if this is allowing air in there won't be enough suction through the carb ?????
Re: Won't start
Posted: Sun Oct 25, 2015 9:36 pm
by Velo Merde
close the carb with your flat hand and kick a few times. might help in some situations with dry carbs....
Re: Won't start
Posted: Sun Oct 25, 2015 9:52 pm
by LI150
Try the hand over carb.
Had reeds out seem free, how can I tell if there sticking?
Re: Won't start
Posted: Mon Oct 26, 2015 1:30 am
by coaster
Velo Merde wrote:close the carb with your flat hand and kick a few times. might help in some situations with dry carbs....
+1
I had trouble starting my TS1 engine when I built it, kicked it over enough to break the kick start
I eventually held my hand over the carb and it fired up straight away....later found that the choke cable had become disconnected at the lever end
Re: Won't start
Posted: Mon Oct 26, 2015 7:27 am
by Toddy
Have you checked Stator Readings is it a known good one ?
CDI ? Plug ? Ht Lead, Green wire from ignition out of CDI etc all basic but worth checking even though there is a spark it may be a bad earth
Re: Won't start
Posted: Mon Oct 26, 2015 9:49 am
by LI150
The plug is dry but I can get it to fire pouring in petrol.
I get fuel into the fuel bowl so all good there.
Its a brand new carb and I have checked for blocked jets.
With my hand over the carb it wont fire
Could it be a air leak thus the engine is not sucking fuel from the carb?
All help is well appreciated