Primary belt drive

[pierodn]

Hi.
Please who supply the best primary belt drive system?.
Thank you.
Piero

 

[Fast Eddie]

I’ve used the following and all were good:

Steve Maney: well made, well proven, raises the primary gearing slightly which is good for the gearbox.

Norvil: cheaper components, not as top drawer as the Maney kit, but very serviceable and low cost. Wide range of gearing available.

cNw: probably the only ‘up to date’ product in the market, very narrow but very strong belt, absolutely top drawer quality components and machining etc. Gives option for e start later if desired. Close to standard gearing.

 

[pierodn]

I’ve used the following and all were good:

Steve Maney: well made, well proven, raises the primary gearing slightly which is good for the gearbox.

Norvil: cheaper components, not as top drawer as the Maney kit, but very serviceable and low cost. Wide range of gearing available.

cNw: probably the only ‘up to date’ product in the market, very narrow but very strong belt, absolutely top drawer quality components and machining etc. Gives option for e start later if desired. Close to standard gearing.

Hi.
The kits are complete or you need to buy or change other parts?
Thank you.
Piero

 

[pierodn]

Is enough to open some holes in the inner primary chaincase only so to hold the outer cover without other holes?
Ciao
Piero

 

[AgentX]

I've been extremely happy with the Bob Newby units on my Enfield and my Matchless.

With the Matchless, it took some spacing work due to the narrow alloy primary case, but I think it's drop-in for a Commando.

http://www.bobnewbyracing.co.uk/?LMCL=zFw8g3

 

[Time Warp]

Is enough to open some holes in the inner primary chaincase only so to hold the outer cover without other holes?
Ciao
Piero

I can not see that being a problem as long as it is not overdone, milled slots might be better.

 

[Fast Eddie]

Hi.
The kits are complete or you need to buy or change other parts?
Thank you.
Piero

Out of the 3 kits that I have experience with, only the cNw really had everything needed, including instructions.

 

[Jerry Doe]

I could not be happier with the cNw belt drive. Very well made!

 

[toppy]

RGM also do a complete kit an it has given me no problem an is good quality.

 

[gortnipper]

Is enough to open some holes in the inner primary chaincase only so to hold the outer cover without other holes?
Ciao
Piero

Are you talking about holes for ventilation?

If so, why not something like these?

https://www.ebay.com/itm/Norton-750...t-Aluminum-BILLET-clutch-vented-/383160164637

 

[Fast Eddie]

Are you talking about holes for ventilation?

If so, why not something like these?

https://www.ebay.com/itm/Norton-750...t-Aluminum-BILLET-clutch-vented-/383160164637

That’s what I use. I’ve never had any reason to suspect things were getting too hot in there.

 

[pierodn]

Dear All,
thank you.
So sorry, but i have forgotten to say you that the bike has the Alton electric start on.
Is the belt compatible?
Thank you.
Piero

 

[Fast Eddie]

No idea!

But I doubt any kit is a straightforward bolt on with an Alton.

 

[Triton Thrasher]

That’s what I use. I’ve never had any reason to suspect things were getting too hot in there.

I’ve been using a Hayward system for a fairly vast mileage on a 650 twin of another marque, without ventilation.

 

[Fast Eddie]

I’ve been using a Hayward system for a fairly vast mileage on a 650 twin of another marque, without ventilation.

Dry ?

 

[baz]

Dear All,
thank you.
So sorry, but i have forgotten to say you that the bike has the Alton electric start on.
Is the belt compatible?
Thank you.
Piero

I have the Alton and a norvil belt drive
The belt is 30 mm wide (although you can use a 28mm)
And because I use an iwis starter chain the chain runs very close to the belt
I run my system dry ,not sure if the norvil belt can run in oil?

 

[Triton Thrasher]

Dry ?

Dry except for a little that leaks in.

 

[Time Warp]

Dry except for a little that leaks in.

Does your PU < ? have a crankshaft seal or a early case without the seal.

 

[Fast Eddie]

Dry except for a little that leaks in.

I’ve been running a unit 650 Triumph with that kind of belt. It breathes through the primary, but as I have removed all the chain tensioner mechanism, any oil in the primary drains back into the sump through the hole that’s normally used for the tensioner blade location. So the primary and clutch receive oil mist, but the belt and clutch isn’t in and oil bath. Seems to work well so far...

 

[Triton Thrasher]

Does your PU < ? have a crankshaft seal or a early case without the seal.

No seal, but not much oil comes out to the primary case.

I’ve run it with no primary case too and it didn’t drip onto the road.