Thanks for the replies lads I will have a good look through the Thumper site and see if I can find anything
And as for the valve gaps we did do them about a year or so ago when we replaced the cam chain but I must admit we haven’t checked them since then so that might be worth a look
The bike has done a lot of miles and I think that it’s had a hard life but it still runs well once it gets warmed up
I will let you know how I get on It will be a week or so until I can have another look at it because of work
Thanks for the help so far Bob
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