Clutch replacement ?

[mira]

70's argo which had a 440 2 cycle engine. I'm replacing it with a Honda four stroke 20 hp do I have to also change the secondary clutch on the transmisson now that the engine clutch is a four stroke. Thanks

[ARGOJIM]

Absolutely.

[mira]

What will be the outcome if I don't change because I 'M unable to tell the diffierance between the two as far as looks. Thanks again.

[Mike]

The ramp angle and spring rates will be different between the two clutches. This means the engagement RPM will not match your motor and you won't get proper belt engagement. I think there are a handful of threads on the topic here in the transmission forum from members with a much more technical response then mine. It may be worth a search.

[ARGOJIM]

The Max clutch at mfg supply should work if you have the 1-3/16 belt.
Your current clutch also runs a tapered bore, the new engine should (hopefully) have a 1 inch shaft.

[mira]

With a Honda 20 hp and with a new 780 comet 4 stroke clutch. How many inches are needed for the clutch to be secure when bolted on to the shaft. Thanks

[ARGOJIM]

2-9/16 or upwards works. Be sure the key is longer so it doesn't fall out.

[mira]

I have 2 7/8 inches from engine block, and the end of the shaft will take a 3/8 bolt to keep clutch attached (being a Honda that will be a mm bolt likely ) Thanks again.

[mira]

Secondary clutch

I have a argo from the early 70's and going to up grade to a Honda 20 hp from a 2 cycle and the clutch on the trans now is app 9 7/8 wide. Can I just change the spring instead of buying the 9 1/4 width clutch and going with the comet 780 primary. Thanks