wet to dry, clutch conversion question

I am toying with the idea of converting my 750ss to dry clutch. The only issue I can't seem to resolve is regarding the mainshaft. On dry clutch bikes, the end of the mainshaft has both a caged needle bearing, and an oil seal, where the clutch pushrod runs through it. The 750 mainshaft does not have the correct counterbore to fit either of these items [neither the stock parts, nor any I can find.] I would imagine the bearing is there to support the end of the pushrod, but as it dosen't rotate [or shouldn't] I would not expect it to develop any "whip". Will the two O-rings on the pushrod seal well enough to keep me from pissing the contents of the crankcase out the end of the mainshaft? Thanks

http://speedzilla.zeroforum.co...42127

Thanks for the link.

Hey blade,
just a note I don't believe the second option (900/sbk 6sp into the 750/620) in my post will work. Referring to BB moto one notebook...
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Brad Black &raquo;</TD></TR><TR><TD CLASS="quote">The 6 speed gearbox from the larger engines won’t fit the small 2v engines, due to the shafts being slightly further apart. The new 6 speed gearbox from the 800SS/M engines will fit, and is much the same as the 6 speed gearbox from the 400 engine I am told. Ducati Performance is also offering</TD></TR></TABLE>

Ducati Capacities Dangerous page you have there Brad, makes me want to buy some engine parts from different models to play with.

But when I split the 620 cases, probably this winter or later, I still try a 748 tranny to see what the issues are. Of course if you are splitting the cases and have a 748 tranny around, let us know.

Jager, thanks for the feedback, and link, [Brad has got an incredible wealth of info. He continuously amazes me.] Tell me, did you use a standard .5" OD [I measure .505, or 12.8mm inside the shaft]x .312 ID seal in the end of the shaft? .312 is a little tight for the pushrod [8mm=.314] but it could work if it sees a little oil to keep it lubed. As far as the internal caged bearing, I'm thinking that as long as you watch/lubricate the preasure plate bearing, the pushrod should never move, so why need a internal support bearing? What's your view?
Thanks

if you're looking for a 748 tranny, here's one for $100 bucks.... http://speedzilla.zeroforum.co...47287

It's not too hard. I've got a Dry-clutched Monster 750 that I converted last year.

Contact me for info if you need any. I used different parts than off of the 900. I'll be glad to help you out with this...

Thanks, Stu. I've emailed you.