Ive finally got a stroker!

[squirrel_hunter]

Good plan with the seals and good news on the carbs. But I've got to ask why was the gearbox stripped and those forks replaced, and who did the work?

[Yakama]

The F3 kit made the bike good for 72 PS unless I'm mistaken.

F3 kit brought it to 65PS per the manual I have, still not bad for how old it is

[Harryredchow]

I used to have an MC21. Awesome little bikes the NSRs. Check the crank seals and bearings. Mine ate a crank after a few hundred miles of ownership. Not cheap to rebuild or replace.

[VFRkieran]

The gearbox was done as it was struggling to select 3rd gear, when it was stripped down one of the selector fork tips where worn so 3 where replaced for peace of mind I think.

Oh I didn't realise it was only 65, can't remember for the life of me where I got 72 from.

Yea it looks like a £1500 job to rebuild the entire engine. I know I'll have to do it sooner or later but I'm hoping I can get a few miles out of it before that day comes. Crank seals are NLA but I have seen them pop up on yahoo japan.

[Harryredchow]

You should join the NSR forum. Lots of info on there.

[jim157]

You should join the NSR forum. Lots of info on there.

It is a weird forum though. Probably one of the most draconian I've been on.

[VFRkieran]

I've been signed up to NSR world for quite a while it's a brilliant source of info but it seems like people get the hump over little things on there so I've avoided posting anything.

[squirrel_hunter]

[quote="VFRkieran"]Yea it looks like a £1500 job to rebuild the entire engine.[/quote]

How much!?!

How on earth have you got to that number?

[Drunkn Munky]

Crank seals are NLA but I have seen them pop up on yahoo japan.

Really? so being the same basic motor as the 18,21 and 28 does that mean there NLA too?

[Harryredchow]

[quote="squirrel_hunter"][quote="VFRkieran"]Yea it looks like a £1500 job to rebuild the entire engine.[/quote]

How much!?!

How on earth have you got to that number?[/quote]

It’s not that bad an estimate. I rebuilt the bottom end of my MC21 and the crank I managed to buy new for a good price, which was £600. Even a rebuild of the crank will be around £500 by the time you have paid for bearing etc. New piston and rings, will set you back a fair chunk. Ancillary items will drive that up around the £1500 mark if you pay labour too.

To my knowledge the crank seals are still available. The bearings are getting hard to find now, but there is a guy in Holland I believe that can source the same parts from the manufacturer.