Topic: Chains, chains and more chains... I'm confused

[Laminar]

PM member HavocTurbo. I got my 750 chain and sprockets from him, great to deal with and great prices.

[Rosinante]

Now my big problem is I'm having trouble unscrewing the case to the front sprocket. The screws are on REAALLY tight and the phillips heads are starting to shred. I'm ganna pick up a bottle of FreeAll if i can find it. Any other suggestions on getting this sucker open?
Do I need a air gun to do it?

You need an Impact Driver.  Anyone who works on these bikes should have one.  Do not use air.

[BobbyR]

Now my big problem is I'm having trouble unscrewing the case to the front sprocket. The screws are on REAALLY tight and the phillips heads are starting to shred. I'm ganna pick up a bottle of FreeAll if i can find it. Any other suggestions on getting this sucker open?
Do I need a air gun to do it?

You need an Impact Driver.  Anyone who works on these bikes should have one.  Do not use air.

The screw heads are not truly phillips head, they are a Japan standard. Most impact drivers have a bit that fits them well. Sears had a decent model for a modest sum.

[phrige]

Thanks for the heads up guys. I'll look into getting one. With putting the screws back in, do they need to be torqued same way. I'm guessing Impact Driver to get 'em out, use it to put them back in.

Def a major help!

[MCRider]

Thanks for the heads up guys. I'll look into getting one. With putting the screws back in, do they need to be torqued same way. I'm guessing Impact Driver to get 'em out, use it to put them back in.

Def a major help!

NO do not use the impact to put them back in! Tighten them hand tight with a #3 Phillips, and that should be enough for the sprocket cover, there is no oil there. If it was an oil retaning cover, you could use a T handle to give them a skosh more. Ride it and if the cover leaks give it a skosh more. THey should only be tight enough to hold back the oil.

The reason you need the impact to get them off is 2 fold: someone overtightened them to begin with and steel screws in aluminum tend to get set in their ways over time.

[phrige]

Oh ok, Thanks MC. I also soaked it in a little bit of Liquid Wrench, Hopefully that will give it a an extra push as well.  I'll pick up an impact driver later today probably.

I appreciate the info.

 Does the gear shift have to come off when removing this panel?

[MCRider]

Oh ok, Thanks MC. I also soaked it in a little bit of Liquid Wrench, Hopefully that will give it a an extra push as well.  I'll pick up an impact driver later today probably.

I appreciate the info.

 Does the gear shift have to come off when removing this panel?

Your welcome. Liquid wrench will help break the bond of the screw head to the cover, but may not get own to where the threads are. And that's OK. AS many here have testified, when they've had to drill the head off the screw as its been mangled too much for even the impact to work, once the head is drilled off the remaining shaft turns easily. SO its not the threads but the bond of the head of the screw to the cover that keeps it from turning.

If we're just talking about the sprocket cover, held on with two screws, the shift pedal should not be in the way.

[MCRider]

Now my big problem is I'm having trouble unscrewing the case to the front sprocket. The screws are on REAALLY tight and the phillips heads are starting to shred. I'm ganna pick up a bottle of FreeAll if i can find it. Any other suggestions on getting this sucker open?
Do I need a air gun to do it?

You need an Impact Driver.  Anyone who works on these bikes should have one.  Do not use air.

The screw heads are not truly phillips head, they are a Japan standard. Most impact drivers have a bit that fits them well. Sears had a decent model for a modest sum.

Correct me if I'm wrong. About 1968 or so, later for some models, Honda adopted the ISO standard for most models at 6mm and above. So the American size Phillips is a good fit. THe Jap Industrial Standard (JIS)  was retained for bolts and screws of 5mm and smaller. They are identified as JIS with a dimple on their heads. THe 6mm do not have this dimple.

I was in the Honda MC Parts Departments at the time, but as a boy I didn't follow the conversations completely. But that's the understanding I have now.

[phrige]

OK great, so I've at least got a leg up on the thing.

OK, I'll have to re-look at it. I thought there where 4 screws which removed a larger portion of the case which was partially obscured by the shifter. (CB550). I may have over thought it, trying to remove more than necessary.

I'm excited to get it off and start cleaning up in there. I just know that area is ganna be grungy.

[MCRider]

OK great, so I've at least got a leg up on the thing.

OK, I'll have to re-look at it. I thought there where 4 screws which removed a larger portion of the case which was partially obscured by the shifter. (CB550). I may have over thought it, trying to remove more than necessary.

I'm excited to get it off and start cleaning up in there. I just know that area is ganna be grungy.

Ooops!My bad. I lost track of who I was talking to. I'm talking about the CB750, 2 screws, no shifter interference.

On a 500/550, I don't know. sorry.   

[Duke McDukiedook]

Now my big problem is I'm having trouble unscrewing the case to the front sprocket. The screws are on REAALLY tight and the phillips heads are starting to shred. I'm ganna pick up a bottle of FreeAll if i can find it. Any other suggestions on getting this sucker open?
Do I need a air gun to do it?

You need an Impact Driver.  Anyone who works on these bikes should have one.  Do not use air.

The screw heads are not truly phillips head, they are a Japan standard. Most impact drivers have a bit that fits them well. Sears had a decent model for a modest sum.

Correct me if I'm wrong. About 1968 or so, later for some models, Honda adopted the ISO standard for most models at 6mm and above. So the American size Phillips is a good fit. THe Jap Industrial Standard (JIS)  was retained for bolts and screws of 5mm and smaller. They are identified as JIS with a dimple on their heads. THe 6mm do not have this dimple.

I was in the Honda MC Parts Departments at the time, but as a boy I didn't follow the conversations completely. But that's the understanding I have now.

+1, 69 and up 750 uses ISO standard, not JIS.

[phrige]

  No prob! Sorry, I forgot this was primarily a 750 thread.

[Rosinante]

Do not remove the shift linkage cover (several screws.....probably eight or nine altogether).  It is not necessary to remove this in order to remove the smaller sprocket cover.  Also, there is a gasket behind the shift linkage cover, and there is oil there.  Big mess.

As others have said, these screws get themselves PLENTY tight during use.  No need to install them too tight. 

I buggered up quite a few screws before I learned the secret of the impact driver.  I wouldn't be surprised if the impact driver was invented by Mr. Honda himself, as the factory-prescribed tool for removing all cross-head screws.

[phrige]

Nice! Thanks,
  I'll have to search some threads on proper opening procedure. 
   Just to make sure I handle the shift linkage correctly.

[MCRider]

Do not remove the shift linkage cover (several screws.....probably eight or nine altogether).  It is not necessary to remove this in order to remove the smaller sprocket cover.  Also, there is a gasket behind the shift linkage cover, and there is oil there.  Big mess.

As others have said, these screws get themselves PLENTY tight during use.  No need to install them too tight. 

I buggered up quite a few screws before I learned the secret of the impact driver.  I wouldn't be surprised if the impact driver was invented by Mr. Honda himself, as the factory-prescribed tool for removing all cross-head screws.

You may be thinking CB750 as I was. The 500/550 cover is much busier, the shift pedal does have to come off, the cover is held on by 4 screws, and there is no oil behind it. What is back there besides the sprocket it seems is the oil light switch, the oil pump?, the clutch lifter and jazz.