Yes, you need it well blown out before you can really read the plug. You need to clear the crankcases of residual oil after a rebuild and it sounds like that is starting to happen. A misfire would have to be pretty bad to gunk up a plug. Have you confirmed you have the correct plug fitted? Its worth...

They do look a little weak but that doesn't really mean much. A big fat spark that doesn't cope with combustion pressures is no use. If some engines with magnetos are not used for a long time the magnetism in the rotor can start to fade away. However, it should reenergise itself if used regularly. D...

Manual I'm afraid!

Keith

Hi and welcome. It unusual for the fuel tap filter screen on the "main" feed to clog on any bike but if its been left a long time with old fuel in then its certainly possible. The easiest thing to do is remove the tap from the tank and check the tap itself as well as the screens. It will also be wor...

Excellent! That's looking great. I rebuilt mine a couple of years back and its picked up some "patina" since. It will cost some money to get the bikes rebuilt again in the future but still cheaper than buying new and way more satisfying and cooler

Keith

Yep, that's good advice to follow re premix. Another way to check the pump is to introduce a small air bubble and watch its progress though that needs a clear oil line - You can even calculate the ml/min from the speed of the bubble as all you need to know is the internal diameter of the pipe. Crude...

Try putting the part number from the CMS site into the David Silver parts site (or even ebay) if you are not happy with what you make. You may find the screw is shared with other models and not hard to find.

Keith

Excellent. You are, however, still left with the mystery of why it seized (is that what happened?). It is important that you check oil pump/lines etc and rule out air leaks. Ideally, get a leak down test done on the engine when its reassembled.

Keith

It does seem terribly painful to rebore just because pistons are no longer available. I doubt the nikasil will be worn as its extremely tough. Any damage to the coating should be easily visible. Personally, I would carefully check the piston and if good then reuse with new rings/small end. That's wh...

Check crank bearings and run a leak down test (if you have the facilities to make it up) to make sure your seals are ok. This could be important if you can find no reason for a seize (assuming that is what happened). Leaky crank seals on the magneto side could suck air and lean off the mixture. Chec...

Its a pain as you need a photo hosting site. I previously used Photobox but they blocked free use. I haven't investigated since.

Keith

Hi Sam, It will be easier to strip out and clean the power valve properly with the barrel off which you really need to do to check the top end properly. Low compression means something is definantly amiss. Power valves need to be free moving else put it will put a strain on the expensive ECU. As kna...

If your compression tester is OK then, no, that's insufficient compression. My AR was very hard to start on 140 psi which what I was getting with worn rings and a scuffed bore. The "thud" you mention does sound like it might have seized. Regardless, if the compression reading is correct (always wort...

Mine was cured by swapping in the clutch pack from my spare engine. I had some slight bluing to some of the steels which was not a good sign. I suspect I overheated the clutch due to my struggles getting up some rocky slopes. They seemed flat when I tested them on my surface plate which was a bit od...

I've also got an Suzuki RG500 and a Ducati ST4S and I can assure you that a CRM is not boring to ride on the road. The CRM positively begs you to ride like a hooligan though. I don't know a lot about the earlier bikes like the MK2 but I don't think they suffer too bad from electrics problems. If the...