Topic: 1975 CB750 K5 SPYDER

[Stev-o]

Ordered it, thx.  It ships from PS very close to my house...

[goldarrow]

Spent half a day stripping down the bike, most of time really was cleaning up oil in the floor.  Must have spilled at least a qt. of oil while draining. 

[goldarrow]

I swear first time doing it was much easier.  But engine is out finally.  Now what?

[goldarrow]

Got the cases split




Looking for the obvious, but where?

[goldarrow]

Is this what causes my 2nd jerks a lot?

[Stev-o]

That certainly is an issue. Doesnt seemed to be spaced properly?

[MoMo]

Is this what causes my 2nd jerks a lot?

That and the gears it slides into definitely.  Problem usually caused by rider abuse-as has been mentioned earlier the bottom end is practically bullet proof unless abused...Larry

[iron_worker]

I would not expect to see any where there at all? Usually all the wear is on the end of the "forks". Makes me wonder if your shift forks were installed backwards or some such thing...

IW

[KrautKoffin]

Awesome build! What did you end up doing with those wheels and body kit?

[goldarrow]

Found left shift fork in parts bin, wonderful condition, got it cleaned up and oiled.   Looked into the gear drum more closely, there is a good amount of wear on the slot where that damaged fork pin sits.  Will have to dig in my parts bin again. If not found, I might have to hit Stevo up for the drum

[goldarrow]

Awesome build! What did you end up doing with those wheels and body kit?

They have been sitting on the shelves.  No idea what I'm gonna do with them. 

[goldarrow]

That certainly is an issue. Doesnt seemed to be spaced properly?

Worn shift drum, caused the shift fork slipping??? At least that what I see in it at the moment

[Stev-o]

That certainly is an issue. Doesnt seemed to be spaced properly?

Worn shift drum, caused the shift fork slipping??? At least that what I see in it at the moment

Pic?   I should have one.....

[goldarrow]

Not sure how we'll you could see from the pic, but there is a worn area with my screwdriver pointing at it



Now my question is, how do you remove the drum, before I damage the case

[goldarrow]

Got the shift drum out, that was too easy, just had to remove the neutral switch at the bottom

And here's a better shot of the worn drum



Found a shift drum in my parts bin, just have to clean it up and oil it

[MoMo]

What is the condition of the gears that that shift fork actuates?  I can visualize the dogs being rounded off...Larry

[goldarrow]

What is the condition of the gears that that shift fork actuates?  I can visualize the dogs being rounded off...Larry

Here's the gear the bad L fork sits on



dogs on different gear



2 shiny wear marks on another gear?



Thoughts, recommendations,  suggestions, anything helps.

[Stev-o]

Sorry, Gold, I just am having a hard time seeing the issue in the pics [and yes, my eyes are good!]
Can you put the trans back in with a good shift drum and fork and try to shift it and see how it looks?

[MoMo]

Gotta agree with Steve, though  the inner part of the lower dog in the first photo does appear to be a tad rounded but that could be either a refection or something close to normal wear and tear.  I am surprised there isn't damage...Larry

[goldarrow]

Case half is back on now, just needed few small hit with rubber mallet.  All is too easy, too good to be true? Used small amount of hondabond around the mating surface, then tight up the bolts. 

My concerns are two things as I couldn't see how the center fork went on to the gear slot, and chain roller. Any pointer?

[MoMo]

You should be able to shift through the gears to ascertain it is together correctly, and it is hard to put the cases together wrong...larry

[goldarrow]

You should be able to shift through the gears to ascertain it is together correctly, and it is hard to put the cases together wrong...larry

That's a relief. 

Got the engine all buttoned up, cleaned, and degreased, will need some touch up paint before going back in the frame

[Stev-o]

You should be able to shift through the gears to ascertain it is together correctly, and it is hard to put the cases together wrong...larry

That's a relief. 

Got the engine all buttoned up, cleaned, and degreased, will need some touch up paint before going back in the frame

Good news. And the test shifting seems fine?

[goldarrow]

Test shifting by hand seems fine, shifts and locks into gears while turning the front sprocket.  May be few times felt like false neutral but that could be because using my weak  hand to turn sprocket???

Or may be I should have my mind set for a 3rd tear down...hmm....

[MoMo]

Test shifting by hand seems fine, shifts and locks into gears while turning the front sprocket.  May be few times felt like false neutral but that could be because using my weak  hand to turn sprocket???

Or may be I should have my mind set for a 3rd tear down...hmm....

That does seem normal.   Good luck with it...Larry