KR-1S.co.uk Forum

Ok I've done what I hoped and got a good few miles on the KR this year, decided I'm definitely happy with it and keeping it so time to take it all apart and make it look a bit (hopefully a lot) tidier. I've done a few bits already:

The day I got it:

and it's latest look:


Work I'm planning is engine strip, crank reworked, barrels replated, pistons, new powervalves & pulleys. Frame/swingarm strip & paint (and all the brackets). Wheels and bodywork into Zeus Blue. I'm thinking that lists going to be a lot longer soon

The easy bit done:







All stripped down, bare frame now.

What's the next job?

Luders wrote:What's the next job?

Frame and swingarm are going off to be blasted and resprayed.. I'll split the engine over the next few days. When the frame and arm are back I'll start slowly getting bits done and bolted back on then I can have fun rebuilding the motor

I hope for your sake you are quicker than me.

500bernie wrote:I hope for your sake you are quicker than me.

It might not take me so long (well that's what I'm think at the moment but lets wait and see) but I can be certain it's not going to look as good. I want to be out on it next year so as long as the engine/frame and underneath bits are done it might go back together for the bodywork to wait another year.. Finally got my hands on a pair of these though

Those silencers on your bike in the Cadwell photo look a bit DEP esk??

They are indeed. They seem to run ok, think they're a standard replacement and it's on standard jetting but I've been wanting originals for it since I got it. Can't believe how heavy the standard exhausts are though, remind me of my old F2 valve!

It's taken longer than I expected just to get this stripped!

Are you flowing your cases?

Aye that's one of my next jobs. I've got a second motor to strip then when I've decided which barrels and other bits to use on the rebuild I'll flow and match the ports a bit before they go off for plating. Noticed some carbon around the edge of the head that came off this motor, the chambers are in great condition but looks like the squish is still original so maybe worth getting it skimmed.

Flowing the cases is a good mod if done well. I have seen some poor attempts in the past and question how much benefit it would bring to the motor.

It's also well documented on here, so good luck.

I've flowed a couple of engines before, but never had a dyno to be able to test the results. It's just good in my head to know that everything matches up as well as it can and it definitely had an effect on the YPVS motors. Not done a KR motor before but planning to do the same as on the other motors and match up all the mating surfaces. I've read the post on here and looks pretty much the same as I've done before. Only downside, previously I was working in a fully equipped engineering shop where we had lots of nice windy tools, now I'm at home with a recently purchased Dremmel !

I've been through 3 dremels this year, they're shit, but cheap and do a decent job while they're working

Have you looked up the info on what to take out and fill on these cases?

I've been looking through the post on the race prep section and the photo's you posted, looks clear enough so far! Building it up by hand there's a lot going on around the base of the transfer ports on the KR compared to other motors, the 2 castings that come in towards the conrod seem to be right under the centre rear transfer? Maybe they help guide the mixture back up into the port as the piston comes down?

Anyway, going to start on it over the next few days, will let you know how I get on. Taking the bodywork and frame to the sprayers tomorrow and dropping a crank it at SEP.