I know a 2 smoker can be a noisey engine but I get a fairly loud and deep thudding knock constantly at idle warm or cold on my MK1. Overbored 1.50 mm. Dep pipe standard jetting running autolube and Boyesen dual stage reeds. Rev it and it goes away but at idle it’s always there! Something to worry ab...

Anyone know why the CRMs have two AC inductive pick up coils for ignition timing?

Surly a single cylinder 2 stroke only needs one right!?

If it’s only while warm it could be worth checking the gearbox breather pipe for blockage. Long shot but the expansion inside under heat could be forcing oil out the seal instead of air out the breather pipe if you know what I mean? If that’s okay then likely hood is that it’s the seal that’s just n...

Got an intermittent/weak spark issue and I’m thinking it might be the ignition cap/condenser. Coil and plug + plug cap check out fine. CDI is a rare failure (it’s a MK1) triggers at flywheel seem to get a signal fine and wiring loom/connections all have continuity and are in brand new condition (rec...

I hate to say it but essentially it looks like you have 2 options. Replace the right hand engine casing if you can find a 2nd hand one. Or if you still have the part that snapped off have an engineering outfit or a mate who can do a decent job of alloy welding reattach it it and try to re tap/repair...

Anyone who finds themselves with a spare 5 mins and has a Mk1 with the original forks on it. Could you measure the distance between the bottom surface of the bottom yoke and the centre of the spindle with the front wheel off the ground? Just looking to see if my forks are at the correct height in th...

Thanks for that Knackered

Anyone? I've just located it under the tank before the oil level sensor but I'd rather put it where it's meant to be lol

Hi there! Could one of you knowledgeable folks let me know where on the MK1 CRM the ignition condenser is meant to be? I'm trying to rewrite one that's loom was butchered and I've no idea where on the bike the component is meant to be located. Can't find any obvious mounting tab for the rubber hold ...

So I've managed to snap off one of the posts in the CRM's inner clutch hub.... Great job I know ha ha Is anyone aware of any alternative hub that works? I know the CR's seem to use 6 posts so probably are out of the question but crf perhaps? The only 2nd hand one I can find is extortionately priced!...

Anyone know what exactly the difference is between a Mk1 swing arm and the other ones? Any pics? I'm kind of certain I've got a Mk2 swing arm and shock on my Mk1 CRM but I definitely have a MK1 linkage! Would this be possible!?

I'm the same boat as you man ha ha ha! My CRM is a MK1, pure eBay gamble no V5 sent off for the replacement log book and the DVLA gave me the same story..... No record of the vin number :-( so I'll have to get it through the registering a second hand vehical farce now as well.... I suspect these bik...

Hi! Been a member since December (rhyme not intended) but this is my first post.... Forum seems like an excellent font of knowledge and has been incredibly handy thus far so many thanks! However I've a question that I don't think has been covered before.... Has anyone ever heard of anyone "extending...