Chain question for Andy

motoddrob

motoddrob

Hero member
Location
S/W Australia
Hi Andy, regarding sprocket alignment, is there an acceptable  tolerance that the sprockets can be out of alignment over the distance between the two? Would 1.5-2.0mm be acceptable?? Oh yeah 530 o-ring. Once it's worn out I plan to use your 530 non o-ring or even go 520 if I can find a primary sprocket ready machined.
Cheers
Rob
 
Way out......the technical amount for misaligned sprockets over the
usual bike distance is 0.1mm.

If you have more you can run a 530 chain on 520 sprockets, not a bad idea idea
if your speedway, grass or road racing.

The iwis non O ring has a chromised pin which gives it good wear durability, a
feature not all motorcycle have due to cost, also most 520 chains are actually
heavier than the iwis non O ring M106SL, yes SL is super life (German falre???).

To sum up put iwis 530 on 520 sprockets it might work but is technically wrong.

It worked for many years on Harleys were they had 530 on 520 sprockets due to
the amount of frame flex and I have solved chain shedding problems on grass and
road racers but getting the sprockets shaved. The guys in Belgium were so happy
they got my bladdered at Netly Marsh last year, good job the dog got me back
to the van.

Andy
 
Please note I did use use the word "technically".

In practice a bigger tolerance would work but not as much as you need.

Andy
 
motoddrob said:
Looks like I'll have to have to have another 2mm machined off the carrier ...
Click to expand...

Sounds as if you need to move the rear sprocket closer to the wheel to line up with the front sprocket. An alternative would be to move the gearbox sprocket further out. If you go for a 520 chain with a machined down 530 front sprocket so that it's still 3/8" thick at the hub, and mount it with the boss inwards (flat side out), that'll shift the centreline of the chain out by about 1.5mm. That might be enough (you did originally say 1.5 - 2.0mm). If you need 2mm, recess the outer face of the gearbox sprocket by 0.5mm where the retainer fits, and put a 0.5mm shim waher behind it.

Messing about with the front sprocket alignment is easier than turning down the rear sprocket carrier. Also, it's a more easily replaced part if you fuck it up!

Keeping the chain as far out from the wheel as possible will give you a wider selection of tyres too.

Cheers,
Cam
 
To position the sprocket in the same place as it was with the Astralite, 23mm off the s/arm I need to move it in 1.5mm. Thought about removing it from the o/s front sprocket and inside rear and use a 520 chain. But then I loose the option of gaining more clearance on the tyre/chain should I need to fit a 160 tyre. There are more tyre options available in 160 profile than 150. I won't do anything till the motor is back in the frame.
At 1.5mm the wheel is 0.5mm off C/L, so 2mm will bring it centre as well as increase to clearance between the caliper carrier and disc from 0.8mm to 1.3mm. Have decided to go with 1.5mm as I don't really thing the wheels being out of alignment 0.5mm is going to make any different. The 0.8mm clearance on the carrier/disc puts the disc C/L in the caliper. Nothing is ever straight forward!!
 
Does anyone have the dimensions of the gearbox sprocket spline for Laverda triples within easy reach?
Dimensions A, B, C & D as in the diagram below, and the number of splines.

I don't have a sprocket handy that I can measure, and I'd rather not dismantle my bike right now to measure it.
I have a vague memory of somone posting this info once before, but I couldn't find it with the search function.

I'm trying to find another bike that has the same spline, as an alternative source for sprockets. Might save the hassle of grinding down a 530 to 520 thickness.

Thanks
Cam
 

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Please note my comments regarding 520 and 530.

As far as I know none of the 520 chains has a chromised pin that the iwis has.

There may be some advantage to running 520 on race machines, and I believe it to be
small, but for road machines it limits the choices of product, iwis dont even make 520,
and because most 520 are heavy duty, god how I hate that term, although Regina do
a light one. There is some weight saving on sprockets but most importantly 520 has
a lower bearing area so will need changing regularly.

Andy
 
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