I have just taken delivery of my brand new "straight cut" primary gears I.e. End of crank and clutch drive gears. I also had a new water/oil pump gear made from a high strength alloy to replace my cracked plastic gear.

It's a shame that they will be hidden by the dry clutch housing, as they are very bling!

Damn, pictures too large to attach!

https://pinterest/DavidBranney/ProjectNSR


Last edited by Daveyb069 on Fri Feb 03, 2017 9:00 am; edited 3 times in total

thats great news, good bit of future proofing work there, would definately be interested in the alloy water pump gear, I've got 2 but both are split to vaying degrees! Will be intersted to hear how you get on with them, any chance you'd share with me where you got them done, by PM of not on here. thanks

Love those, where did you get them ???
Would like some for mine

I also asked the question, but no response yet, I have however found out that T2 racing in Japan are doing the alloy waterpump gear/ spindle / bearing and mechanical seal in a kit. Just gotta get it from Japan, so gonna cost a bit but worth it I reckon in the long run as plastic ones are knackered in both of my engines!

I believe Ellis Moore (Oily Tom) makes them. He does all sorts for motorcycle gears at Moore Performnce Engineering

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

Looks really well made, and interested to see the finished product.

E-mail me the photos if you want, I can host/add them to the thread.
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They look superb and great to see someone doing something different, Would be interesting to see a before and after dyno run to see what difference the straight cut gears make.

Reference the rivets it might have been the case that Honda used counter sunk head rivets and the flat head is the formed tail.