Yamaha RD R5 case questions

[4schizzle]

Hello all,

I could not pass up an r5 bottom end at Mid Ohio.  Couple questions: Is it correct that R5's were only produced in 350cc?  I need to get some cylinders and heads and just wanted to know what my options were.  Also I have a couple of spare transmissions, can you put a 6 speed transmission into a 5 speed r5 case? Just curious of the differences between the 5 speed and 6 speed bottom ends.   

As usual I appreciate all of the knowledge on this forum.

Thanks

[m in sc]

r5 cases can be used  for 250 or 350, rd r5, ds7, etc.., and yes you can put a 6 speed in there (but oyu have to change everything in regards to the transmissions drum/linkage, etc.

The real big 2 differences between r5/ds7 cases and rd250/350 cases is:

no 3 screw bearing retainer behind the clutch basket (so you have to use stepped washer on the clutch shaft) and
2: no grooves for the crank seals to set in, so you must use R5 crank seals. thats basically it. (and thats fine)

[4schizzle]

Thanks m in sc,

And there goes my hope of using the extra seals I bought by mistake for my rd.  Just an update about my rd and the petcock/gas issues that you helped with before.  The coil mount I made for the HPI coil was cracked or breaking and it finally broke.  Also cleaned out the fuel inlet on the carbs.  They were sonic cleaned but i am guessing there was some hard residue in there that was not cleaned out.  Fingers crossed that this fixed the issue.

Thanks again! 

r5 cases can be used  for 250 or 350, rd r5, ds7, etc.., and yes you can put a 6 speed in there (but oyu have to change everything in regards to the transmissions drum/linkage, etc.

The real big 2 differences between r5/ds7 cases and rd250/350 cases is:

no 3 screw bearing retainer behind the clutch basket (so you have to use stepped washer on the clutch shaft) and
2: no grooves for the crank seals to set in, so you must use R5 crank seals. thats basically it. (and thats fine)

[4schizzle]

Hello again, I have some additional questions about swapping an RD 6 speed transmission into an R5 case.  I have the transmission gear set.  From my understanding I also need to use the RD Shift Drum and forks.  Is there any other parts that I need to use from the RD?  Also per what m in sc said, what is the stepped washer I need to use behind the clutch basket on the clutch shaft?  Is it SPACER 1 | F/0024515 Part# 278-16181-01-00, basically the stock spacer behind the R5 clutch basket as there is not retainer behind the clutch basket on an R5 case.  Thanks as always for the help!

 

[SoCal250]

The part 278-16181-01-00 you mentioned is a spacer which is used in all the models; R5, DS7, RD350, RD250.
That part is #16 in the diagram

The stepped washer Mark is referring to is #17 in the diagram: PLATE, THRUST 1  278-16154-00-00, which is used instead of the RD250/RD350 part THRUST PLATE 360-16154-00-00

[4schizzle]

As usual thanks for the help and knowledge on this forum its greatly appreciated. 

The part 278-16181-01-00 you mentioned is a spacer which is used in all the models; R5, DS7, RD350, RD250.
That part is #16 in the diagram

The stepped washer Mark is referring to is #17 in the diagram: PLATE, THRUST 1  278-16154-00-00, which is used instead of the RD250/RD350 part THRUST PLATE 360-16154-00-00

[m in sc]

progress! and sorry about the seal thing.. my bad. I just forgot about the lack of the lip groove

[IR8D8R]

If you have to source a transmission anyway, you might want to consider using an RD400 trans instead. Details are in the tech section. Supposed to be much better 5th and 6th gear ratios. I'm going to do it the next time I split my cases.
 I believe that you need to use the 400 clutch basket also.

IR8D8R

[m in sc]

you do. nice thing is banshee/rz baskets swap so lots of aftermarket options.

[4schizzle]

That would be nice but I have a couple of RD transmissions in a box of parts that got given to me.  The price is right on an RD 6 speed. 

[4schizzle]

Good morning, I have a quick question. I am doing the 6 speed swap. Is there any differences between the 6 and 13 spine main shaft. I have inner hubs for both and I have both 6 and 13 spline main shafts. I think I am correct that is the main shaft and not countershaft. It is the shaft the clutch basket goes on. Thanks again.

[DesmoDrew]

  If it is a 350 6-speed, all the R5 clutch bits and countershaft sprocket will swap over.  If it is a 400 6-speed, you will need a 400 (or Banshee) inner clutch hub and a 400 pressure plate and springs/bolts, as well as a switch to a 400 c/s sprocket.  The R5 clutch and basket should be fine if you have a 350 6-speed and are sticking with the R5 clutch assy.  However you may need a bit of 'three-card-monty' with the fiber and steel plates to get the correct pressure and friction if switching to a mix of later 350 or 400 bits with the R5 basket.
   The 6-spline drive end (clutch side) is 400. The output shaft also has a 6-spline output c/s end.

[teazer]

IIRC, the 6 spline is the same as an H2, H1 and GT750.  13 spline is the same as a TZ250/350. GS750, 1100, GSXR and a few others.  Check the JT sprockets listings to be 100% sure though.
 

[4schizzle]

Thanks for the info but now I may change gear sets due to information in an earlier post.


I ended up using the 13 spline main shaft as it appeared in better shape (cleaner).  When installing the main and countershafts gear sets I seen that the stock r5 basket also has 13 splines.  I also have two other baskets and inner hubs in a box of RD parts that I got.  One basket uses the (90149-05147-00 SCREW, SPECL SHAPE) and the other uses (90159-06010-00 SCREW, WITH WASHER).  So, i am guessing from the info I received, I may have a transmission/clutch from both an RD350 and 400. 

If it is a 350 6-speed, all the R5 clutch bits and countershaft sprocket will swap over.  If it is a 400 6-speed, you will need a 400 (or Banshee) inner clutch hub and a 400 pressure plate and springs/bolts, as well as a switch to a 400 c/s sprocket.  The R5 clutch and basket should be fine if you have a 350 6-speed and are sticking with the R5 clutch assy.  However you may need a bit of 'three-card-monty' with the fiber and steel plates to get the correct pressure and friction if switching to a mix of later 350 or 400 bits with the R5 basket.
   The 6-spline drive end (clutch side) is 400. The output shaft also has a 6-spline output c/s end.

[m in sc]

yah you can mix and match all sorts of stuff. any of it is fine though, just use a 7 disc clutch and you'll be fine