Recessed vs non recessed 420 sprockets

[JPark]

It seems that both are available. Does it relate to the end of the countershaft or the spacer or whatever? What do I need to know?

It also seems that 32 tooth 4 hole rears are NLA as are 34 tooth 6 holes. Is it time to make some more or is there a workaround?

[gregg_floren]

If you've already tried Hodaka Parts Inc, and Hodaka Parts Idaho, then...

Sprocket Specialists will custom make almost any Sprocket and for a very reasonable price.

Good folks and long time Hodaka Days sponsors.

Gregg

[JPark]

Thanks, Gregg. It seems to me that making a dozen at a time would be more efficient, but with the CAD/CAM techniques now it's often just as easy to do custom jobs, once you have the basic parameters.

Still need - well want, actually - some take on the recessed counter sprocket thing. I've always used the recessed ones but wondered what the non are for. 90s?

[matt glascock]

M's 90, 92, 92B, 93 with the four bolt hub.

[taber hodaka]

According to all my manuals the models 90,92,92A,93 had the four bolt dish sprocket and the 92B, 93A had the flat sprocket and cushion hub. ------------Clarence

[JPark]

What I'm referring to was the countershaft recessed sprockets. I'd already figured out the rear situation. I just don't know whether the recessed or non recessed countershaft sprockets are critical or just a matter of preference.

[Tether]

I thought the recessed sprockets are for the 428 chain and the non recessed are for 420 chain.

[dirty_rat]

Just to verify, you are talking about a c/s sprocket where the mounting area is thinner than the tooth area of the sprocket, correct? If so, I would probably prefer the full width sprocket as it would give a larger contact point on the countershaft. The 420 sprockets are already pretty thin and on 40+ year old parts I would go for maximum contact. On the 428 sprockets I would run a recessed sprocket to give more room for the sprocket nut to thread on. Again, just my thoughts.

[JPark]

Looking at HodakaParts sprocket section it appears that the non recessed sprockets are for the models up to the 92B. The 92B+ and on use the recessed type. I'm still wondering whether they interchange or if something wouldn't work out right if I used the recessed ones on a 90. I guess if it fits, wear it, but would rather order parts that could be moved between older and newer models freely.

Any Sprocketologists in the house?

[taber hodaka]

The recessed sprocket was for the 423 chain, used on the 92B+ that began with frame number A-67613. -------Clarence

[JPark]

From what info I could glean, 423 is just 420 with a larger diameter roller. 428 is 5/16" roller and the roller diameter is 8.5mm vs 7.75 on 420. 423 seems to have been transitional and that leaves 420 with flat counter sprockets or 428. A 420 chain should go on a 423 sprocket but the roller will be loose. That raises the question of 423 rear sprockets.

Thanks, Clarence. For some reason I never knew 423 chain existed.