Waste of money .....

[koko64]

More like Factory Pro numbers than Dynojet ay?
The 1100's torque curve is very impressive.

[MonsterHPD]

Evening, all.

I hope to find some more power for the M800 during the winter, and since the clutch is slightly marginal already with the stock motor, what would you recommend I do with the wet clutch on these bikes?

Stopintime, I assume you do not have a stock clutch on your hotrod?

Kind regards,
Torbjörn.   

[stopintime]

Evening, all.

I hope to find some more power for the M800 during the winter, and since the clutch is slightly marginal already with the stock motor, what would you recommend I do with the wet clutch on these bikes?

Stopintime, I assume you do not have a stock clutch on your hotrod?

Kind regards,
Torbjörn.   

Oh no, no, no  Two broken clutches (large springs in the primary driven gear) which could have ended much much worse. Good idea, lousy engineering and even worse: a factory that won't realize/admit it. They have the same shit in Panigales.

I have a 750 clutch. More grabby, but that can be helped by grinding 10-15 grooves in the steels, in a fan pattern. The 696 clutch also fit (also without the springs).

[MonsterHPD]

Thanks :-)
I'll check the spare parts lists. I have no experience with any of those clutches, except changing the plates in my M800.
But it seems I'll be on ebay soon ....

[MonsterHPD]

Ever so slowly   ST2-cam project is underway.

One of many projects my pal has started is a TT2-type project. It actually got started before the present Classic Sportsbike and Supermono racing took precedence. He did a "conversion kit" to put St2 cams in the the 695 heads. He´s not quite sure how this goes together, and I´ll have to chheck for myself when I get the M800 heads in pieces, but I suppose it will be something similiar to this:

20191213_180415 by torbjörn bergström, on Flickr

The alu spacer is to compensate for the difference on the drive side, and the narrow ring spacer is to compensate for the shorter cam bit on the cam cover side (does show too well in the photo).

I´ll do the basics before the top end comes completely off: Squish, valve pockets (ST cams simulated by "ST cam timing" inlet and exhaust, openingand closing, on the M800 cams (I think that will give a good indication, correct me if I´m wrong). 

Let´s see what that brings.   

[MonsterHPD]

I did y first attempt at a leak-down test yesterday, on the M800. Looking at the advice from Speddog and others (in the other thread) I started by checking the clocks by pressurizing the gauge without attaching the motor hose. It showed about a 1 psi difference at 90 psi, so I take that into account.

I only have a small China garage compressor, so 90 psi is all it can muster. Also, taking readings is a bit difficult becaus eth small tanka empties quickly, then the compressor starts again, increasing the pressure to 90 and some psi, and then slowly sinking again.

As a first attempt, I decided to test with the pistons at BDC.

Anyway, on the horizontal cylinder the gauges showed (corrected) 90/82 psi, for a leak rate of 9% acc to the gauge table, with very audible leak thru the inlet, impossible to seal by pressing the hand aginst the inlet port.

The vetical showed 90/84 psi, for a leak rate of 7%, most of it thru the exhaust port.

I have no reference for this test, but both the numbers and the very audible leakage was a surprise to me, especially on a bike that actually runs quite well.  I will certainly do some more leak-down tests to see wher my other motors are, and how thi one will be after the top-end job.             

[koko64]

 

[MonsterHPD]

I´ve spent the last few garage days making baseline tests on the M800 motor.

Squish on the vertical cylinder is between 1.05 and 1.20 mm, so not too much to be gained there.

Valve to piston clearance is pretty generous with the stock cam, remains to be seen what will happen with the St2 cam in place

M800 Standard_03 by torbjörn bergström, on Flickr


It really seems that the only thig needed to put the ST2 cams in the M800 heads is a 10 mm spacer on the drive side:

2019-12-23 14.50.20 by torbjörn bergström, on Flickr

In order to check for valve to piston clearance, I´ll have to do the valve clearances with the ST cam in place. A bit tedius but unavoidable.

A Merry Christmas to everyone,
Torbjörn.

[koko64]

Merry Christmas

[Duck-Stew]

What is the difference in the cam base circle between the OE M800 cam and the ST2?

[MonsterHPD]

What is the difference in the cam base circle between the OE M800 cam and the ST2?

I don´t know, but the duration is almost 30° more on the ST2 cam, which hopefully can be translated into a bit more power.

[Duck-Stew]

I don´t know, but the duration is almost 30° more on the ST2 cam, which hopefully can be translated into a bit more power.

Base circle differences will affect shim dimensions or at worse valve stem length.  It’s time to check that now.  That way you’re not opening a larger can of worms than you expect.

[MonsterHPD]

OK, I see and thanks for the hint.
I don't think it's a problem since others have done this, but of course it's worth a check.
I'm in the process of installing the cams in order to check valve to piston clearance, so I'll soon know ...

[koko64]

 

[koko64]

Those cams have 1mm more lift. If they fit ok it will be interesting to see how the bike performs.