Suzuki 2 Strokes

Bobf wrote:Hi Tato - I have a NOS starter clutch part that your photos are showing as damaged. Happy to post it to you or put it on Ebay - my bike's clutch is the later one and I spent some time accumulating a few parts before stripping the engine to find which type it was, so it is surplus to requirements

Bob

I send you PM.

Hmmmmm.

Are the cylinders nikasil? I thought they were cast?

L to B models destined for Europe were nykasil or SCEM plated and different ports

I recently found out there were some with schneurle ports (same as scem barrels) but with liners so they could be bored. Just fitted some 1mm oversize to a 550B and runs really nice.
Supposedly used in Germany? I will be inquiring regards these for more info.

Indy650 wrote:Are the cylinders nikasil? I thought they were cast?

Yes, they are nikasil. My cylinders are flying to Japan, they will have Nikasil (scem) put in Japan. I have a friend who has been a motorcycle mechanic in Japan for seven years.

Guys, I got a part of the starter clutch. Thank you very much Bobf.
A new part, look:

but I still need gear clutch starter

Is there a difference between 12620-34003 and 12620-34004? Can I use 12620-34004 if I had 12620-34003. Bulletin GT-26 does not say anything about it.

Alan H wrote:I recently found out there were some with schneurle ports (same as scem barrels) but with liners so they could be bored. Just fitted some 1mm oversize to a 550B and runs really nice.
Supposedly used in Germany? I will be inquiring regards these for more info.

http://www.pjme.co.uk/" onclick="window.open(this.href);return false; are the people who do them.

I've just fitted a set to a friend's late 550 and so far so good - very quiet too. http://www.kettleclinic.co.uk/kcforum/v ... 517#p87517" onclick="window.open(this.href);return false; and http://www.kettleclinic.co.uk/kcforum/v ... 16&t=11248" onclick="window.open(this.href);return false; if anyone is bored.......

If it helps, my parts book for the J,K and L models shows 12620-34003 as the correct part number for the early clutch

Bob

They are the same. The only difference is that there are 2 oil grooves on the new one. The clutch basket is identical. One guy says, it was Suzuki trying to solve a design flaw by modifying it and eventually scrapping it and changing to Borg Warner.

I'd use the new one, then, and you should be "good to go". Use a high quality synthetic or semi-synthetic motorcycle oil (for wet clutches) in the gearbox and it should last much better than "back in the day" - you may have no problems with it at all.

Bobf wrote:...Use a high quality synthetic or semi-synthetic motorcycle oil (for wet clutches) in the gearbox and it should last much better than "back in the day" - you may have no problems with it at all...

I think so too

Usually, semi and especially full synthetic oils will just make the clutch slip on engines designed for 'old style' mineral oils.
Just use a decent oil as specc'ed in the original Suzuki manual - 'a good quality SAE 20w40 multigrade transmission oil is to be used'.
As 20w40 was fairly uncommon back in 1972 when I got my first GT550, we all tended o use 20w50 mineral oil and mostly still do.
Of course, anyone else can do exactly as they wish, clutch plates aren't that expensive.......

it's been a long time. But it was all because of the high cost. But during that time I did the nikasil at Langcourt and the crankshaft at Chriss Applebee. Now I am putting everything together. The new type carburetors are still missing I have an older type. Does anyone have a set to sell? Or a replacement? I wonder ,if newer type carburetors will work well on nikasil? what do you think

Newer type carbs work well on nicasil barrel engines. I have them on my A and I still have the bike. The story of the rebuild is here - https://www.kettleclinic.co.uk/kcforum/ ... lit=Earwig - it's a long thread and shows 2 rebuilds and lots of details.
Baz Wilkes on Kettle Clinic forum restores carbs and usually has sets for sale. Not cheap, but vey good - he's done almost all mine.