$79 Ebay 350 cylinders spec check

[2t Fan]

Now on most kits in description its mentioned as "Keveldwulf"  is Keveldwulf sells on eBay directly ?

[m in sc]

the link is in my original cyl post

here. it just lives in my watchlist.

https://www.ebay.com/itm/284796177040

[RDryan]

did you get the 350 baffles in the pipes or still rocking 250 baffles?

Nope and that is kinda why I figure there's a part of the puzzle missing among some other potential tweaks. 

BTW: your eBay link goes to the seller who sells the Kvedwulf supplied kits. I also bought 2 of these a couple years ago and paid about what you paid. The quality seems much better on these than others we've seen pictures of. Check out bottom side of cyl pictures and look at the sleeve match to cyl with no gap for example. I believe the sleeve looks thicker than others I have seen too. YMMV

Now this is good to know. It's hard to tell the quality differences of these kits just looking online.

[m in sc]

yambits sells suspiciously cheap  but good replacement baffles for 350s. would recommend

[RDnuTZ]

Now on most kits in description its mentioned as "Keveldwulf"  is Keveldwulf sells on eBay directly ?

2 years ago when I bought my 2 sets there was only 1 seller of these Kveldwulf kits User name Westpactech. He has changed to new user name Superb Vintage Finds. I believe it is a business/vendor in China that supplies the kits to a dealer network in USA for resale. Likely more than 1 USA importer now. Could also be sellers are using the Kveldwulf name as a marketing trick but acquiring elsewhere

[RDnuTZ]

BTW: your eBay link goes to the seller who sells the Kvedwulf supplied kits. I also bought 2 of these a couple years ago and paid about what you paid. The quality seems much better on these than others we've seen pictures of. Check out bottom side of cyl pictures and look at the sleeve match to cyl with no gap for example. I believe the sleeve looks thicker than others I have seen too. YMMV

Now this is good to know. It's hard to tell the quality differences of these kits just looking online.

I just checked his feedback on these kits: 31 Positive, NO Negative, and 1 single Neutral that sounds sketchy: "Pistons were short by 1mm resulting in very low compression. Transfer ports never fully open which doesn't help compression either. Not sellers fault I should know better than to buy anything made in china.
Yamaha RD350 Cylinder Rebuild Kit Pistons Rings Pins 1973 1974 1975 US/UK Model (#284796177040)"

[m in sc]

dude was probably dealing with a bent rod. lol.

[Dawid92]

Nr1 is one of the 90$ special bought this month  and Nr2 is bought 2 years ago.
1 does have some very low port timings, and funny counterbore on the bottom of cylinder, the liner is thinner 1,5mm per side compared to the 2nd one there (on top looks like its thicker).
Casting looks way better, no casting flashes ect.
The A transfer tunnels doesn't have the hook cast on the exit, just straight shot
Mine came with bent fin and one piston is clearly having hard time to go through the bore. Roughly measuring exh is 32mm from top, transfers except boostport are a lot lower (don't remember exact height).If the sleeve is ok, this might be a good candidate to port it to stock spec. Pistons look better than those that came with nr2 older set. But I would probably look for the TKRJ or something else.

And link to the 2023 set https://www.2strokeworld.net/forum/index.php?topic=5650.msg48758#msg48758

Here's more photos of 2025 and compare to older one. https://imgur.com/a/ne7fs8Y

[2t Fan]

BTW: your eBay link goes to the seller who sells the Kvedwulf supplied kits. I also bought 2 of these a couple years ago and paid about what you paid. The quality seems much better on these than others we've seen pictures of. Check out bottom side of cyl pictures and look at the sleeve match to cyl with no gap for example. I believe the sleeve looks thicker than others I have seen too. YMMV

Now this is good to know. It's hard to tell the quality differences of these kits just looking online.

I just checked his feedback on these kits: 31 Positive, NO Negative, and 1 single Neutral that sounds sketchy: "Pistons were short by 1mm resulting in very low compression. Transfer ports never fully open which doesn't help compression either. Not sellers fault I should know better than to buy anything made in china.
Yamaha RD350 Cylinder Rebuild Kit Pistons Rings Pins 1973 1974 1975 US/UK Model (#284796177040)"

Some will sell the cylinders without pistons at a price less 20-30 $

[1976RD400C]

The gasket shows where there is room for improvement.

[RDnuTZ]

 

BTW: your eBay link goes to the seller who sells the Kvedwulf supplied kits. I also bought 2 of these a couple years ago and paid about what you paid. The quality seems much better on these than others we've seen pictures of. Check out bottom side of cyl pictures and look at the sleeve match to cyl with no gap for example. I believe the sleeve looks thicker than others I have seen too. YMMV

 


Some will sell the cylinders without pistons at a price less 20-30 $
[/quote]

Correct. What is the advantage of that when you would then spend another ~$200.00 for piston kits? The beauty is the full kits delivered at a great price and not needing to spend more time & $ sourcing more parts that may or may not be compatible. I live in a small rural town with no shops that can bore cylinders to matching pistons for me and the kits filled a huge need for me. Of course, quality is extremely important and being choosy on which vendor you buy from is imperative.

[RDnuTZ]

The gasket shows where there is room for improvement.

almost looks like your gasket is cut unevenly with right side being wider than left side in picture. May just be the camera angle though... is the gasket OEM?

[2t Fan]

BTW: your eBay link goes to the seller who sells the Kvedwulf supplied kits. I also bought 2 of these a couple years ago and paid about what you paid. The quality seems much better on these than others we've seen pictures of. Check out bottom side of cyl pictures and look at the sleeve match to cyl with no gap for example. I believe the sleeve looks thicker than others I have seen too. YMMV

 


Some will sell the cylinders without pistons at a price less 20-30 $

Correct. What is the advantage of that when you would then spend another ~$200.00 for piston kits? The beauty is the full kits delivered at a great price and not needing to spend more time & $ sourcing more parts that may or may not be compatible. I live in a small rural town with no shops that can bore cylinders to matching pistons for me and the kits filled a huge need for me. Of course, quality is extremely important and being choosy on which vendor you buy from is imperative.
[/quote]
In case if someone wants to use a high quality piston

[Pravin]

Ran the micrometer on the new cylinders and pistons.
Cylinders were within .0005" of taper and each other. Pistons were exactly the same size. Ring end gap was .009" and 3 of them and .000 on 1 of them. Piston clearance is about .003". Not really any port chamfering done. This is very odd, look at how the small transfer port is lower than the larger one. It's so low it is not open all the way when piston is at BDC. The larger tranfer is at the right stock height but the little ones are too low. The exhaust port seems a bit small, and the top is 31.5mm down, stock is 29.5mm. The wall thickness of the sleeve that sticks out the bottom is 2.75mm, an oem cylinder is 4.50mm. I think you would have trouble if you installed these without checking and adjusting a few things.







I have got the exact set in India , Indian HT models were having 31mm Exhaust and 46~47mm Transfer and Yes the Aux Transfer port opens at 48 : ( same like this kit ...

I spend 2 days with Pencil files and 300 400 grit papers and  did the chamfer and the ports came out smooth ...I used DYKE ART STD Pistons .

Bike ran reasonably well but am planning to match up the aux port to 46 and see how she performs when I get some time .

USA 29.5 Kits also have this xfer port mismatch issue ?

Cheers,
Pravin