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Connecting rods

On the way to more power, the connecting rods are one weak point of the 750 SOHC/4 engine.

CB 750/900/1100 rods

The connecting rods from the later ('79-) 750/900/1100 DOHC engines fit and are a bit more rigid. Unfortunately, the 750 DOHC rods are about 1.5mm shorter than their SOHC counterparts, the 900 and 1100 DOHC rods are approximately the same amount longer.

The 1100DOHC rods have 17mm wrist pins, as opposed to stock 15mm. The 70mm 750 VFR pistons have 17mm wrist pins and a matching height.

CB750SOHC and CB750DOHC rods

750DOHC are approx. 1.5mm shorter

CB750SOHC and CB900DOHC rods

900DOHC are approx. 1.5mm longer

CB750SOHC and CB1100DOHC rods

Aftermarket rods

A better, yet more expensive solution are con rods from APE (manufactured by Crower), Carrillo, Cyclexchange or Falicon. They are expensive, but worth the price - remember, one broken rod can ruin your whole day.

Carrillo H-Beam

Expensive, but worth it

The Carrillo H-Beam and the Crower spec sheets are available in the Download section.

Russ Collins had steel aftermarket con rods, but they are no longer available new. There have been aluminum con rods from various manufacturers, as MTC, Yoshimura, Russ Collins and others. I would stay away from them, aluminum stretches under heat and has a low fatigue resistance and who wants to see a piston touch the head because of a stretching con rod.

A word of caution

At least the stock con rod bolts are not designed to be re-used! When tightened properly (and you should do that at any rate), they will stretch beyond their elastic limit. When re-used, they may come loosem, and if they do, it's a major havoc in your engine.The '78 F2/F3 rod bolts are said to be stronger than their predecessors and they also fit the earlier rods.

Questions? Suggestion? Please use the forum!