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Yosh Race Pistons: 2V 1000?

Dyke rings were a good idea to stop ring flutter at high levels of piston acceleration. Previous to this the only way to stop flutter was to go for thinner and thinner rings.

However, Dyke rings do suffer with the drawback that they get rattled around considerably at high revs and, whilst they maintain a seal well, the ring and the piston ring groove get battered eventually resulting in failure of either the ring, the piston or both. Therefor it's the high maintenance option (ok for racers).

As far as I know the only manufacturer that persisted for a long time with Dyke rings was Bultaco but I don't think they've used them for a while now.
 
I had a Moriwaki big bore kit for (don't laugh) a CB400T. Took that bad boy all the way to 425cc!! This thread reminded me that the pistons used Dykes style rings - must be a Moriwaki characteristic. I have no idea where you would find rings like that. Maybe send the pistons to Total Seal and have them cut new grooves?
 
these are KZ pistons

these are KZ pistons

Allright guys, I'm willing to try being a guinea pig, so we find some things out, so feel free to chime in here. It looks like I ended up with Kawi 1105 pistons & an 17mm wrist pin... Bad news... I'll either have to sell them, or just have some fun and figure out if this will work.

Bore = 73mm - No problem, I have an 1100G block
Valve cut outs = Bigger than I need, so I should be able to run high compression and a high lift cam w/out a problem
Wrist Pins = looks like I'd be best to bore them to 18mm - - Possibly, I could use nylon pin retainers if I can't get the stock clips to stay in place.
Compression ratio = who knows?? I may have to do a little milling to get it correct.

All that seems like stuff I can pull off, one thing I need to find out is whether or not the KZ and GS heads used the same valve angles.. This could cause problems with the reliefs already cut into the pistons if they are the wrong angle.

Does anyone know?? Thoughts or other potential problems?? I even considered running KZ rods, if they could be adapted to a GS1000 crank, so I am wide open here.
 
For laughs relist them on ebay with the correct info and see if they go for more then you paid. The Kaw performance parts crowd is hungrier then the gs crowd for parts. If they don't go for much have fun, just remember machine work costs lots of money nowadays.

First things first try to find some rings.:o

Talk to Stan Gardner he should know what you can do with a gs1000 crank
 
first timer said:
For laughs relist them on ebay with the correct info and see if they go for more then you paid. The Kaw performance parts crowd is hungrier then the gs crowd for parts. If they don't go for much have fun, just remember machine work costs lots of money nowadays.

First things first try to find some rings.:o
Click to expand...

If I put them back on ebay, I am going to wait until my feedback is old enough that no one can see what I paid for them. Plus, with a little cleanup, they look a heck of a lot better than when I bought them. :)

As far as rings go, I spoke to Redline Cycle in Skokie, IL today. They build mostly older KZ bikes. They recommend I call Total Seal, but said they might have to be special made.
 
pistons

pistons

You should be able to bore the pin out to 18mm and then have the circlip grooves recut,but if I remember correctly the kawasaki valve angles are different than the Suzuki. So even though they are larger than the valve reliefs in your stock piston, depending on valve angle you could possibly end up with less valve clearance. Bottom line is could you make them work? Sure but by the time you get done with the machine work you would probabaly be better off getting the correct piston for your application. Relist them on ebay, don't worry about what you paid, none of those Kawasaki guys are looking at Suzuki parts! Take the money and put it towards a good set of pistons.
 
WOW..
all i can say is WOW.
how long is this thread?
39 pages or something?
well, maybe not that long.
17mm is old kz/z1 kawi stuff.
gpz/ maybe late gpz 83-84 was 18mm.
yes valve angles and combustion chamber/dome area's are differant for sure.
i would drive to the ebay sellers house and give him a Z1 enima with them...one at a time.
retarded people selling m/c parts.
geesh.
if he has any sack at all he'll refund your money no questions asked!
 
Well, maybe he knew, maybe he didn't, but I suspect he never measured the pins & thought they were Yosh style pistons... He had two sets listed, and the other I was sure was a GS piston because I had one to compare. If he was trying to make any money on them and actually knew they were for a KZ, I suspect he'd have listed them that way.

Maybe I shouldn't, but I am taking some of the blame because I had plenty of time and did not confirm the wristpin size. Frankly, even though I haven't been working on Suzuki's that long, I should have known better.

The more I think about it, I'll probably re-list them on e-bay myself. Frankly, they are a lot nicer than they appeared after soaking them in some carb cleaner & wiping off the carbon. I've only got $50 bucks in them & honestly, they look like new. The oil rings are the same as a Wiseco 73mm piston, so basically everything rides on fact they have a dykes compression ring, which might be hard, expensive to find, or have made.

Hopefully, a few KZ guys will fall all over them and I'll get back more than I paid.

Need a bunch of bidders so they go real high, so Rapidray and I can have a chat about his pistons... I'm gonna need to sell a bunch of stuff on ebay for those :D
 
If you post them on ebay make SURE you list them under AHRMA as one of the categories. The vintage racers will pay good money for these parts! Ray.
 
rapidray said:
If you post them on ebay make SURE you list them under AHRMA as one of the categories. The vintage racers will pay good money for these parts! Ray.
Click to expand...

Well, their on ebay now.. I was considering claying the head and figuring out how the valve pockets were going to look, but I can't do that until after I bore the block, so it would have been just another delay to a project I already wanted to have started in June.

http://cgi.ebay.com/ebaymotors/ws/e...2844&ih=016&sspagename=STRK:MESE:IT&viewitem=
 
first timer said:
where did you find the rings?
Click to expand...

I never really looked. I tried to call TotalSeal twice, but never got to speak to anyone.
After that, I decided to go ahead and try to sell them.

I really want to do something other than the standard Wiseco 1085 kit with this build, but keep it a street bike, well, mostly a street bike. :) I might have to look into the CP pistons or some other options and see where that takes me.
 
dardoonk said:
first timer said:
where did you find the rings?
Click to expand...
I never really looked. I tried to call TotalSeal twice, but never got to speak to anyone.
After that, I decided to go ahead and try to sell them.

I really want to do something other than the standard Wiseco 1085 kit with this build, but keep it a street bike, well, mostly a street bike. :) I might have to look into the CP pistons or some other options and see where that takes me.
Click to expand...

I did finally speak to Total Seal. They could have made dykes rings for without a problem, I just needed to send them a piston. They quoted me $150 for four sets (compression & oil rings)

I ended up listing the pistons on ebay. This time correctly as KZ pistons and they sold for $157, so in the end, I made $100 in whole deal :)
 
Let me know when you want me to build you a set of CPs! Glad you came away smelling like roses instead of smelling like something else!:D Ray.
 
DSC04818.jpg
,
russ collins piston set 76 mm = 1176 O ringed cylinders too
 
Holy cow Jeff! Those are ANTIQUES, huh?!!! They have to be almost 40 years old, am I close? Ray.
 
rapidray said:
Let me know when you want me to build you a set of CPs! Glad you came away smelling like roses instead of smelling like something else!:D Ray.
Click to expand...
Yea, I lucked out, but that goes to show that you need to list things right on ebay. Now, about those CP's.. do you work there??
 
I used to work there & am still sponsored by them. I am a dealer for them & can order anything you want. Let me know if you're interested. Ray.
 
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