Hi All,

Just to confirm my MC21 Straight Cut Primary Gears and Alloy Water Pump were made by Ellis Moore (Moore Performance - UK).

The build has been a bit of a saga due to Honda not using a standard size rivet to bind the clutch basket and gear together, the holes measured 6.2mm diameter. Honda also used flat head rivets, which is again quite rare in industry especially in this size. My original idea was to follow Nicks RS 125 wet clutch/dry clutch modification (2strokeracelabs) by tapping the clutch basket. I showed Ellis the original clutch basket and he advised that rivets would be the best option, as he couldn't guarantee the strength or durability of the alloy that's used in the basket.

I couldn't find the same size solid rivets so the rivets I have used are supplied by Sapphire Products UK. They are Monel round head solid rivets with a shank diameter of 1/4" (6.35mm). They required the shanks shaving down to size to ensure they fitted correctly. The rivets were then hydraulically formed using a press and forming tool, they have nearly the same formed head area of 11.125mm as the original flat heads of 11mm. The rivet heads are taller and therefore require modifying to ensure there are no clearance issues. There are no problems with the tails as they form the counter sink and are then finished off to ensure there's no interference.

I will try to post some pictures showing the final assembly.

Regards

Dave