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Mocheck Harrier

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Laverda Dave:
Some info I have just dug up from a reliable source on the internet states the following specs of a genuine Harrier as follows;
The Harrier came about in 1977.
Engine was based on a 458cc Yoshimura conversion with a racing camshaft fitted along with a lightened crankshaft and improved porting for the head.
Electronic ignition from Lumenition.
Carbs were standard but rejetted with 85 mains to suit the larger capacity of the motor, I was incorrect about the CR's, I saw those on a replica Harrier and was the subject of a previous forum thread some years ago. The bike later appeared for sale at Motorcycles Unlimited.
Exhaust was a black Piper system with reduced back pressure. No power figures were quoted but the original 37bhp was likely to have been upped to at least 55bhp.
The chassis featured S&W rear shocks with CMA cast aluminium wheels painted white and fitted with Avon Roadrunner tyres.
The bike was finished in white.

From the photo I don't think that bike is a real Harrier looking at the rear shocks and I don't know if the Harrier had a Dresda swing arm either. It would, I guess be very difficult to ascertain if was a real Harrier without looking inside the motor!
The Harrier was tested at 113mph, just think if it had been painted Parkeet Yellow, I'm sure 125mph+ with a standing quarter of 6 seconds could have easily been achieved (ahem, possibly....... 😉).
I don't know if there's a Harrier register, maybe something on FB perhaps?
Ian Tay who was one of the two original partners of Mocheck recently passed. Classic Bike did a feature on him about a year ago, it's worth a read.
A real Mocheck Harrier is something very special.

taysidedragon:
The Mocheck Harrier had a cut out modification to the fuel tank.

Laverda Dave:
That was the replica Harrier that was discussed previously on the forum Gareth. The guy who built did an excellent job. He had fitted the CR carbs. It was being sold on eBay, it had a smoking engine as a result of worn valve guides. It mended up for sale at Motorcycles Unlimited minus the CR's and exhaust.

Rozabikes Tim:

--- Quote from: taysidedragon on August 22, 2026, 12:37:46 AM ---The Mocheck Harrier had a cut out modification to the fuel tank.

--- End quote ---
Was the tank cut out just a styling thing? Should have left it alone if so for me.

Sent from my Pixel 5 using Tapatalk

taysidedragon:

--- Quote from: Laverda Dave on August 22, 2026, 09:13:07 AM ---That was the replica Harrier that was discussed previously on the forum Gareth. The guy who built did an excellent job. He had fitted the CR carbs. It was being sold on eBay, it had a smoking engine as a result of worn valve guides. It mended up for sale at Motorcycles Unlimited minus the CR's and exhaust.

--- End quote ---

I've only seen photos with the tank mod. Looks better without it.

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