Mr Riggs Hydraulic Clutch Conversion

Thank you very much! I have a very hot motor running about 12:1 and the smoother the clutch the better. I will be very excited to have this on my experimental bike.

 

Boy this is really taking off, personally I can’t wait either

 

A specific made to measure is obviously preferred, but do the side covers vary much from model to model? I would not have thought so; however, to be confident that the fit is appropriate then surely a few shims inside the cover between the side cover and master cylinder should do the job if necessary ... better to have a bit more than not enough depth.

Slippery

 

Clutch push rod will determine the difference.......2M did a lot of work with the clutch and at one time got some push-rods made, do a search

 

Here is a link to 2m' Clutch push rod rabbit hole....lots of measurements in here so that will tell you if the side cases are different, or not.

http://www.xs650.com/threads/xs650-clutch-pushrod-experiment-tidbits.32267/#post-327110

 

Aluminum pusrods do make a differance.
Starting at post 8 is more information on them.
I offer a 1 piece all Aluminum rod. 2M is OK with me selling them.
http://www.xs650.com/threads/magura-clutch-lever-and-aluminum-pushrod.56574/

 

2M's rods are one piece 7075T6 aluminum. It's quite a nice piece and comes in one length that he determined ideal length.

 

When I get around to tearing the engine down for refresh I will go through a detailed analysis. I am going as far as I can without breaking cases.

 

Just to come back to the clutch spring analysis - I have never understood why they are so stiff in the 650 ... in my early days of fast 2 strokes, riders always rode with 1-2 fingers on the clutch lever ; as that's all it took to disengage when a seizure lept up to get you (1960s) before Suzuki introduced posiforce lubrication, then everybody did it and no more lock-ups. I believe the springs are way over engineered and to relieve the issues of drag etc just delete a plate or two to relieve the pressure; should they then slip just add washers behind the springs to micro adjust pressure. Anyone else have some thoughts?

 

What do you mean by that?


I prefer my original 2 piece push rod. I feel the middle ball keeps it from spinning in the seal and apparently a much better heat differential than the oem 1 piece.

 

1,2,4,8,16~ thousands of an inch

 

Early two stroke seizures were characterized by a slight loss of power and a sudden welding of the piston to cylinder.
It's something of a geographical joke. If you weren't there you don't get it.
Imagine riding along and having a broom handle stuffed into your rear wheel...

 

My clutch lever is so hard to pull..Arthralgia in my hands makes it difficult at best to operate the brake and especially the clutch lever...I'm on the fence over what to do yet..Lets see how this plays out...but I am interested..

 

Back in the day, knew a lot of guys with RD350 cafe racers, a couple worked at the local Yam dealer and had access to mod their engines even as far as buying the aircooled TR350 racer cylinders, heads and pistons to fit on them. We'd take them up to Summit Point Raceway for track days.
They always said, "Keep one finger on the clutch lever at all times, if you feel the slightest reduction in power pull the clutch in because a seizure is eminent"

 

https://thexscafedotcom.wordpress.com/2020/12/
This shows at least 3 distinct covers. So we may need to measure for true dimension between them. When I get home from work, I have 7 covers ill take a batch measurement.