Merc duplex primary chain for SF2 engine

LaverdaSoren

LaverdaSoren

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Nora Sweden
I am building an engine for my caféracer twin and are looking for the 'big pin' IWIS G67HP version (3/8" x 1/4") “bush” type chain.
When I search on the net I can not find the IWIS chain from an european dealer!!! Can someone Please give me advice how to find the IWIS chain?
I have found a chain called SWAG 99 11 0376 with the size G67HP - does anybody know the level of quality for the SWAG chains?
I have also found a FEBI Bilstein 25207 chain but the size is described as D67ZN. (?)

And as I have new primary sprockets I guess the best position to mount the duplex chain is on the two inner cogs closest to the crankcase?
 
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motoddrob said:
If there is an option to use a duplex why would you use a heavier triplex? also I find the IWIS way more fluid than previous triplex I used many years ago. There was probably a good reason Laverda stopped the triplex in favor of 2 single rows
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In case someone opens up the primary case and finds that the rivets are non genuine. No way I would trust any triplex again after breaking two of them. I have gone to two singles.
 
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Apparently, the better test was Steve Bs and before that Chris Cuttlers extremely powerful Championship winning Twin that regularly broke Primary Chains and was doing his head in looking for a fix till Andy's chain did exactly that. It had something to do with the way it delivered its power. It convinced me how good that Chain is. I got one very early after that.
 
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Vince said:
Apparently, the better test was Steve Bs and before that Chris Cuttlers extremely powerful Championship winning Twin that regularly broke Primary Chains and was doing his head in looking for a fix till Andy's chain did exactly that. It had something to do with the way it delivered its power. It convinced me how good that Chain is. I got one very early after that.
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A multi cylinder is easier on transmissions, and tyres, than a twin, and I imagine that a 180 or 270° twin is easier than a 360° The worst is a single. It depends on how the power pulses are metered out. Power itself might even be secondary.
Paul
 
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Paul Marx said:
A multi cylinder is easier on transmissions, and tyres, than a twin, and I imagine that a 180 or 270° twin is easier than a 360° The worst is a single. It depends on how the power pulses are metered out. Power itself might even be secondary.
Paul
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180 and 270 twins are harder on chains than a 360 twin. Both 180 and 270 twins have power strokes close together then a long pause till it happens again. 360 twin is at least evenly spaced.
If the tooth numbers on the primary are selected caerefully you can have what's called a humting tooth. Ie the power strokes never happen on the same tooth twice running. Evens out chain and sprocket wear. i think most Morse chain applications use this.
 
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CLEMTOG said:
buy a Triplex for a Norton Commando, and shorten it. One third the cost of anything else and you can choose between, Regina or Reynold.
CLEM
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Back when Andy chain was around, he said to avoid anything made by Renold unless the box said "Made in England". If it does not say this you are getting a cheap industrial chain that won't last. He recommend for triplex chain, Regina and for duplex or simplex chains, IWIS.
 
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For the record.
The Chain Man had it ok, but I was uncertain if the delivery would be with the Swedish Post Nord. I have had a number of problems with that company, especially when something has been sent from outside the EU.
In the end I got the IWIS chain from FEBI Bilstein. It came as a rivetted chain for some car so I took away a few links and used a rivet connecting link that they supplied.
 
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