Topic: Splitting the Crankcase, do I have to remove the flywheel??

[CB750R]

Ya that sums it up. and if soo do I need a special too?? or is there a laymans way around it?  I'm having a peek into my spare bottom end to determine if its worth using.

[CAPTRON]

Hey , what's a too?? Only kidding. I would like to know too how hard it is as I have a supersport that won't go into first and I think second or maybe it's third. 

Has anyone here been playing with their gear boxes?

Thanks, Ron

[Patrick]

You can split the cases without removing the flywheel. It can stay atached to the crankshaft. They make a special tool to remove it, but you can get it off pretty easily without the tool. The inside of the flywheel is threaded and takes, I believe, a 20mm bolt. After I removed the retaining bolt I screwed a bolt I picked up at my local bolt house into the flywheel under it was tight against the end of the crankshaft. Then, holding the flywheel with one hand so it wouldn't turn, I used my impact driver to drive the bolt against the crankshaft. The flywheel popped right off. It's wedged on there by the retaining bolt. You only have to budge it a little to get it free. But, like I said, you don't need to remove it if there's nothing wrong with it or the crankshaft. Have fun.

[bryanj]

Like already said all you need is a bolt to screw into the thread on the flywheel BUT its an "odd" thread so you need to be lucky. A "proper" aftermarket tool costs about $10-$15 and you will need one if you need to get at the starter clutch

[CB750R]

Hey before you get ahead of you're self check to see if the Shift star mechanism is together properly. When I got my bike the shifting was horrible. Under the cover that has the shifter rod comming from it there is the linkage from said rod to the shifter star mechanism. I found mine almost apart, as the center screw that holds it all together had backed it self out.  If this is all jibberish let me know and I'll take a photo of said area. All I know is that #$%*ty shifting was fixed with a bit of blue locktite!!!

I'll keep ya posted on how mine comes apart

Patrick thanks for the info dude.

[Bob Wessner]

let me know and I'll take a photo of said area.

I'd like to see one if it wouldn't be too much trouble.

[Patrick]

I may have been just lucky, Bryan, but the bolt I used was just a standard machine thread. It also worked on my '78 Honda CB400t.

[bryanj]

Hi patrick the thread is a "standard" metric just not the most common pitch on that diameter so you was lucky!

[Patrick]

I don't disagree, Bryan, and I am far from an expert on thread pitch. But for anyone looking for a bolt for the same job, you don't want the bolt that the real bolt people know as the fine pitch for that size and you don't want the one known as the coarse pitch. You want the one in the middle that the bolt house folks called the "standard thread." For all I know bolts come in a variety of pitches and not just the three. All I know is the bolt I got, which measures 20mm with my caliper (I decided to go back and measure) fit snugly and could easily be screwed with your fingers up to the point where it contacted the crankshaft. I have a couple other flywheel pullers for my other bikes - the kind where you have one bolt inside another bolt and you turne them against each other - and they work fine. But the 20mm bolt on my Hondas is by far the easiest, most effective tool of the three.