[Andy Spin]

EUREKA petrol after you’ve stripped your carbs as many times as me!

But it’s finally worked!

Checked Float level – within spec
Stripped down carbs to the last bit, a la Haynes manual,
I think the key this time was blowing cleaner through the pilot screw circuit over & over again.

I returned the needle heights to standard, and like magic….. I’d lost a screw to hold the diaphram tops on!!! Oh bother I said [thought something else]

Replaced screw, and carbs to bike.

One of the coldest days of winter, I was one glowing with the super results.
The bike is transformed !!

Thank you to all who responded to the posts, great to have a bit of moral support, it has certainly helped me persevere.

Isle of Man here we come!!!!

Regards
Andy Spin
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[Andy Spin]

UPDATE,
Thanks for all the tips and help on carburettor subject guys.
I have tried to raise the needle height on the main jet on these carbs.
On doing so, I discovered there was no provision for adjusting circlip height, but I did use a spacer under each needle shoulder to raise them (approx. 2mm) for a quick try.

Unfortunately, the bike felt exactly the same, and I did not do enough miles to change the colour of the spark plugs significantly so I have to try 2 (last?) things a friend noted a couple of ideas,

1/ Another carburettor clean!

Including complete removal and cleaning the mixture screw which I have not yet done.
Not sure how to balance them them though!

2/ Check the Float Height, as Katana mentioned

I am told the if the height of the fuel is too low, their can be insufficient fuel drawn through the jet, so I will check this. Still surprised this setting can change, but who knows!

I’ll have a go the weekend & keep you updated.
Cheers, Andy Spin

[Andy Spin]

Thanks for that info, and the time taken to help me.
I never imagined I’d be so keen to check the most intimate nooks and crannies of my carbs!
Ah! Plug chops, takes me back to the RD250’s & power valve too!

Thanks again, I’ll keep you posted.

[Andy Spin]

Thanks but I’ve already had one from a Z550, and unfortunately the Zephyr 550 is quite a bit bigger, cheers anyhow.

[Andy Spin]

Good stuff guys,
Just a bit more info on my ill fated bike.
It’s a 1991 GPz500s, very clean, and only with 10,000miles on the clock.
It had been off the road for 2 years, with terminal engine trouble [no oil pressure, sop I have replace the engine but used the same carbs.
The fuel and carbs were obviously showing signs of varnishing and hence the problems I thought, so cleaning has been the order of the day so far.

Thanks for the tips & advice chaps, I’ll check the carbs again & let you know. On the bright side, I’m getting quick at taking the carbs on & off!!

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