K2 (later 350) front sprocket availability

[R1100purist]

Hello! I’m looking for a front sprocket for my ‘84 K2 but everyone seems to be out of them (mdina, herdan) is there another source I can use? It’s the later version that is has the 2 flats versus the earlier splined version (or did I get this back words) like so:
https://www.mdinaitalia.co.uk/M190123.html

Also what is the standard pitch on a 1984 K2? I’m putting this bike together from parts so there are some questions.

[3potjohn]

When I got my K1 it was running 530 chain. I decided I wanted to try O or X ring chain.This meant I had to drop to 520 to get clearance around the engine sprocket.
The upshot is that there seems to be a 530 front sprocket on ebay at present. You would then have to change the rear assuming it is currently a 520.
I do not know if these will become available again which will be an issue. The K1 was the first chain driven bike I owned in 30 years, not my favourite transmission but more simple,lighter and cheap.
John

[MickeyMoto]

When I get 5 minutes I'll root around my boxes as I am sure I kept the packet mine came in. I am sure it was a JWT from Taiwan or something.

[SupermotoDave]

Splined are for 500s, all 350s are 2 flats.

[funsize]

I’m not sure if this is helpful but I’ve recently converted my 1980 Strada to 520 so I have what appears to be a decent 530 chain and sprockets available. It had a clip link that was removed but may be wise to get a new clip link. Anyway, the offers there if 530 is the path chosen…

[Steve Brown]

Some useful info passed on by Jenny Westwood for you- www.erre-sc.com/en/264-front-sprockets
Is worth a try for you. About 2/3rds down the page is PBR1170

[R1100purist]

Hello all and thanks for the very helpful answers. I’ve seen a lot on 520 conversions but missed why this was beneficial in the first place (now I know it’s for crank case clearance for x or o ring chains).

I’ll keep on doing my research and I’ve DMed funsize about his chain and sprockets too.

[MickeyMoto]

Sorry, my packet was for a rear sprocket, a JT1022.38

Try chainsandsprockets,Co.uk for the front one. You probably need the dimensions from the Italian site in a previous post.

[R1100purist]

Great, thanks. that’s a descent price, although we’ll see how much shipping is to the US.

Some useful info passed on by Jenny Westwood for you- www.erre-sc.com/en/264-front-sprockets
Is worth a try for you. About 2/3rds down the page is PBR1170

[R1100purist]

New wrinkle then, if I was going to do a 520 conversion where would I start looking for those sprockets? Are we talking custom made at that point?

And finally since I don’t have the originals, what was the standard gearing for a 84 350? 14 and 36?

[Steve Brown]

New wrinkle then, if I was going to do a 520 conversion where would I start looking for those sprockets? Are we talking custom made at that point?

And finally since I don’t have the originals, what was the standard gearing for a 84 350? 14 and 36?

The later kanguro had 520 as standard, so look for that. No need for custom made unless you want a different size.
Standard gearing was 14t and 38t. If you went 36 you'd find top gear almost useless.

[morini_tom]

Mdina have the front sprocket in stock in a 520:
https://www.mdinaitalia.co.uk/M190138.html

And this is the rear sprocket I fitted to my K1 when I converted to 520: in a 39 tooth.
http://www.jtsprockets.com/catalogue/part/JTR18/

Definitely worth going to a 520 chain if you’re replacing chain and sprockets anyway.

[R1100purist]

Awesome thanks again for the replies and gentle corrections re: appropriate sprocket size. Hopefully this coming conversation can help others who are new to the world of morini.

Morini tom, do you notice significantly higher revs or does your 1 tooth out back not make a huge difference?

[R1100purist]

Also 96 link chain even with a 39 tooth rear sprocket?

[norbert]

96 links will do with 39 tooth.
You notice every tooth. To tear well a 38 plate, the motor must be in good condition. Some years I used up to 40 with my 350 to enjoy the 6th gear. I´m not so interested in a super high speed score reached after 1 mile pulling.
Since years I wear 14/39 also with a 501 in street model frames and quite satisfied.