Gs550et

[roadrunner]

Hi there all,

Here is a wee list o my problems for my GS550ET (1980 V Plate).
The old girl won't open up between mid and top end range, bogs down but goes again but not fast. When i pull out the choke she takes of for a few seconds then slow down again, nothing over 60mph.
I have done the usual, stripped the carbs, petcock, stripped down the cylinder block and regrounded the valves, compression about 110 on all cylinders now. I have also put in new 'o' rings in all the carbs, the main jet needle is now up on to the highest notch. It seams to be a fuel problem but as i have said previously carbs are in good condition.

There is a 4 in 1 exhaust system on the bike of which the details are: Motad Type M5S Fab No 4390. The original jets are still in the carbs, so maybe i was thinking with a 4 in 1 exhaust system, will i need to put in bigger main jets/needles?
There is also a Boyers Bransden Electronic Ignition sysytem fitted which seems to be set ok.
The bike starts 1st time and revs up good until about 5500revs but when i take her out on the road not so good.
Does the ignition timming have anything to do with the top end performance?
Read the manuals and we have followed the instruction to the letter.
Now at my wits ends on getting the old girl to run good.
Help is required.

Either please reply or if you want give me an e-mail.
Yours waiting at the side of the road.

[roadrunner]

Sorry jim no help here, but seems to me to be a carb issue.

[Nessism]

Free flow exhaust pipes require larger jets, the mains at least. Not sure if this will solve the problem completly but it's a start.

[8trackmind]

Carb boots? Petcock?

[chef1366]

You added more air with the free flowing 4-1 pipes and need to compensate with more fuel, mostly with the main jet. Do a search for plug chops and tune your needle and main jet in by reading your spark plugs.