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Wow #14 is an expensive one! When ordering make sure you get replacements with the correct features as some of these have circlip grooves in the OD, etc. The Partzilla diagram mentioned above has photos of the parts you can use for reference

#     PART NUMBER      DESCRIPTION
12   93311-22027-00   BEARING, CYLINDRICAL 20-30-15
14   93305-20502-00 (93305-20508-00)   BEARING B5205 Special 25-52-20.6
24   93310-22057-00   BEARING K20-24-10 S
27   93311-42045-00   BEARING, CYLINDRICAL 20NQ3315NE 20-33-15
31   93306-30504-00   BEARING B6305N

thanks SoCal250

Managed to find below , not sure if they are exact replacements

B6305N

20-33-15 -20NQ3315NE (Koyo)

20-24-10 -K20-24X10 S (Koyo)

B5205 Special

20-30-15 - RV203015-JTEKT (Koyo)

The bearing numbers are listed in the specs in the back of the service manual.

ok thanks. Let me check it out

https://www.partzilla.com/catalog/yamaha/motorcycle/1973/rd350/transmission

Which part????

Part 31?

All the bearings inside the gearbox. I am looking at the numbers like "B6305N" etc

Can anyone help me with the generic transmission bearing no.s for the air-cooled '73 RD350

Thanks

the only ones affected would be the crank seals and they are what they are. im not sure of the materials used currently but us fuels are 10% and I've never ever had an issue. I don't avoid ethanol and its NEVER caused an issue. my 0.02

Yea worried about crank seals. It's 20% ethanol now in India. 0% ethanol is expensive and not available everywhere. I think all seals are not made if viton. There are issues like gumming, rusting, fuel lines breaking etc. loss of power is noticable along with fall in fuel efficiency. Any solutions are welcome. Thanks

with the E20 fuel introduced in India, is there any manufacturer any where in the world making suitable grade Viton oil seals compatible with Ethanol for RD350.s ? 

Indian Rajdoot Yamaha is having similar front foot pegs

any suitable replacement spring which give faster return ? original part no 360-14131-00

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.
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In case if someone wants to use a high quality piston

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 $

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

Chinese cylinder exhaust port height between Indian HT and US Spec at 31.5mm 

Stock US exhaust port height 29.5mm (39bhp)
Indian HT exhaust port height 32.00mm (30.5bhp)
Indian LT exhaust port height 36.00mm  (27bhp)

are the spares available for these kits ? OE rebuild kit is suitable ?

i think all are of the same specs and maybe coming out of the same factory. Kveldwulf is just a name used by a seller ? i think so . ports are similar to the US bores and these are of fairly good quality. Better to use some good brand pistons and bearings with it. I use them on my RD 

These are supposed to be Girling type derivative.
https://njbshocks.co.uk/
$135 the pair.

 I have RFY on on my RD350. A little stiff for most people but I'm ~240 lbs. I don't really like the reservoir type so I may try the NJB. They are available in 320mm.

IR8D8R

Any pics of it mounted on the bike

cost £115when I checked. He will ship also