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Did the sync yesterday and the suspect carb/cylinder was slightly lower than the rest, but only sightly. I adjusted it. While the boots are old and the clamps on the air box side are jubilee clips they all seem OK to the eye. I have some easy start coming today which I intend to use for leak...

Got sync gauges coming today so will test the vacuum sync. Has anyone used the Color tune device to help with the fuel air mix screw adjustment? I have found that I get a nice strong circulating bule color on 3 cylinders and hardly any thing on the 4th, even when I alter the fuel mix. The...

Throttles snapped shut when off the bike and moved freely, intake rubbers are not the best but I can not see any leaks when I spry them. Not balance the carbs, need to learn how, Just adjusted the fuel mixture. I don't think it is anything to do with the throttles as it does not do it when...

New problem - I managed to get it started with the aid of a 2 KW fan heater to worm the engine for first start up. it has started every day since. I have adjusted the fuel mix to around 2 turns and the plugs seem fine. I have ridden it for a couple of miles after each adjustment with a warmed up...

Any ideas how to check without specialist equipment - I am a novice. If I try to turn the cylinders by hand with the spark plugs in will I get to a point where I can turn no further if I have compression or will I be able to complete the cycle?

Over the last 4 days I have rebuilt the head - new rings and gaskets, torqued ever thing to spec, set the cams and managed to refit the engine in the frame on my own with the aid of a trolly jack, 2 ratchet straps and some 2x4 wood. All in the middle of a British heat wave of temperatures...

Hi all, Back again after a year!!! Engine has been in tubs all year. The rest of the bike under a cover. I am now semi retired so now have the time to get stuck in. I came to the conclusion that the head had been over skimmed at some point and that the gasket had been doubled up with the bolts...

Thank for taking an interest. I have proven that it is a gasket problem and that at some point in the past the head must have been schemed. I have now sourced some thicker gasket to make my own and see it it works.

Put a layer of grease on top of the pistons and rebuilt the head turned the engine both ways between the 2 ends of travel where it jams. Striped the head down for about the 7th time. no grease anywhere other than the tops of the pistons. I am at a loss as to what to try next. HELP

I have measured the base gaskets, old and new - new gasket 0.4mm but the old is 1.8mm

Sorry for not posting I have been tied up working. Pics of the old gaskets the green one looks as though it could be 2 gaskets stuck together with gasket sealant? Any ideas?

Thanks, All I have done is strip the head and replace the gaskets and O ring seals, no machining

Thanks for the replies. As far as I know the head has not been machined but it may have been in the past. I do not have the cams in place so correct me if I am wrong but it can not be to do with the valves? I have gone though my bin and dug out the old gaskets. They are in bits from when I...

Hello again, Took the head off last night. Gave it a good looking at. used an airline at 6 bar to blow out all the insides. Found nothing wrong that I could see so put it back together again. Once again it turned fine until I applied pressure to the head nuts. Even when I snug them down the...

Thanks I will be taking it off again tonight. Not the timing chain, I will take pics.

just the head to replace the gaskets as I had a oil leak. The bike had been stood for over 14 years and the previous owner had done enough it make it a runner and I have done about 200 miles on it before stripping it down. When it jams it is like it is hitting something.

No, The pistons are in the cylinders and move fine until I start to Torq the head nuts. I have tried to Torq them all to 15 ft/lbs, 20 and 26 ft/lbs but the same thing happens every time, I can turn the engine 1/4 turn but no more. I can not understand why it is fine until I bolt it down as I...

Hi, I am a novice in the middle of putting the head back together after replacing the head gaskets. Everything appears fine - when the engin is turned manually the pistons travel up and down in the cylinders until I attempt to Torq the head nuts. When I apply ANY Torq more than finger tight to...