gt550 overheating + 2 cylinders

Jay2903 · Scooby Slapper Joined: 03 May 2016 Karma :

hey guys
I've been fixing this one for a while now. Thought I'd start a new topic because the problem has changed. Basically ive replaced the piston rings and a valve on cylinder 4 and its had new gaskets. This was becuase it had low comression on that fourth cylinder.

Two problems now

Its over heating

and only running on cylinders 1 and 4. No spark going to 2 and 3. Coils and plugs are fine.

Paddy Blake · World Chat Champion Joined: 29 Jun 2006 Karma :

Did you clean the carbs.?
How do you know the coils and plugs are fine.
I thnk firing order is 1/2/4/3 but check this then you can change
the HT leads around to fine if it is the coil/plugs.

Paddy Blake · World Chat Champion Joined: 29 Jun 2006 Karma :

The two middle carbs have different springs and needles so you don't
want to mix them up.

It's an old bike and the rubber connectors from carb to engine
could be cracked.

Jay2903 · Scooby Slapper Joined: 03 May 2016 Karma :

Paddy Blake · World Chat Champion Joined: 29 Jun 2006 Karma :

Jay2903 · Scooby Slapper Joined: 03 May 2016 Karma :

[/quote]

Most likely electric.
The coil that didn't is not earthed or connected right.
Clean the frame where the coil goes and metal on the coil and see if that works.[/quote]

I'll give that a try

Jay2903 · Scooby Slapper Joined: 03 May 2016 Karma :

Paddy Blake · World Chat Champion Joined: 29 Jun 2006 Karma :

Your first post says it's not firing on 2-3 so fuel is not getting
burnt.
Smell the oil to check if is smells of petrol.

Did you change the oil filter at the same time ,if you don't then the oil will stay in the filter so you use less.

Most 4 stroke depend on the right level of oil for the crank
spinning to oil the cylinders and pistons.

Crank spins and throws oil up to these parts if it's to high or
low it won't get thrown up.
Also

Jay2903 · Scooby Slapper Joined: 03 May 2016 Karma :

Jay2903 · Scooby Slapper Joined: 03 May 2016 Karma :

Jay2903 · Scooby Slapper Joined: 03 May 2016 Karma :

Could it be the oil pump ?

Jay2903 · Scooby Slapper Joined: 03 May 2016 Karma :

Or the fuel air mixture ?

Jay2903 · Scooby Slapper Joined: 03 May 2016 Karma :

Anyone ?

Paddy Blake · World Chat Champion Joined: 29 Jun 2006 Karma :

Jay2903 · Scooby Slapper Joined: 03 May 2016 Karma :

Paddy Blake · World Chat Champion Joined: 29 Jun 2006 Karma :

Jay2903 · Scooby Slapper Joined: 03 May 2016 Karma :

Jay2903 · Scooby Slapper Joined: 03 May 2016 Karma :

[quote="Jay2903"]

Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

If it's making the exhaust glow on idle and overheating then you better check the valve timing again. could be the carbs too but my guess is you're a tooth out on the cams.
____________________
a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy

Jay2903 · Scooby Slapper Joined: 03 May 2016 Karma :

Paddy Blake · World Chat Champion Joined: 29 Jun 2006 Karma :

I have a feeling that when you took the cams out some of the
valve shems moved out of place.

But is there a spark.

Check those rubbers as it's an old bike.
You say they're fine but you can't know for sure.
Read all the post in this thread incase you missed some.

Jay2903 · Scooby Slapper Joined: 03 May 2016 Karma :

Paddy Blake · World Chat Champion Joined: 29 Jun 2006 Karma :

Good job.

Jay2903 · Scooby Slapper Joined: 03 May 2016 Karma :

Paddy Blake · World Chat Champion Joined: 29 Jun 2006 Karma :

Many get the carbs balanced.