Super Roadrocket (oilpump) tacho drive

[barry2]

Hi Chaps --A while ago I bought a (oil pump) Tacho drive for my S rocket, but it's for  an A65 and  too long, can I convert it ie cut it shorter also the spacer tube doesn't fit over the drive slot anybody got any diamentions, thanks for your help--Barry

[JulianS]

No because the worm is cut in the opposite direction.

A65 top photo A10 below.

[barry2]

Hi Julian--
Thanks for that Does that mean the A10 Tacho head goes a different rotation to A65? A10 =A/C?--Barry

[Klaus]

Hi Barry,

SRM Oilpums had the tachdrive.

https://shop.srmclassicbikes.com/product/srm-a7-a10-oil-pump-kit-billet-high-delivery

cheers Klaus

[KiwiGF]

Hi Chaps --A while ago I bought a (oil pump) Tacho drive for my S rocket, but it's for  an A65 and  too long, can I convert it ie cut it shorter also the spacer tube doesn't fit over the drive slot anybody got any diamentions, thanks for your help--Barry

It may not help but you can fit an A10 pump “nose” section to an A65 pump, use that, and gain the advantage of 30% wider gears that way, as an alternative to an SRM pump. I have done that. Chances of finding an A10 nose section with tacho drive might be low though! 

[Greybeard]

..... you can fit an A10 pump “nose” section to an A65 pump, use that, and gain the advantage of 30% wider gears that way, as an alternative to an SRM pump.

I wonder if that explains the 'high capacity' steel pump I bought from John (Bantam) Phelan for my bike.

[barry2]

Hi Chaps--Still not quite got this, did the later R/Rockets have a Tacho driven off the ( standard ) oil pump and if so was it a/ clock guage  or did they  have magneto gear drive--Barry

[JulianS]

The Super Rockets with DA10R prefix engine numbers had the tacho driven from the oil pump, 3;1 ratio.

The Road Rocket and earlier Super Rocket with CA10R prefixed engine numbers used a tacho driven from the magneto gear.

Original fitment DA10R engine tacho was Chronometric type with face number RC 1303/03.

Looking directly at the rev counter drive on the pump it rotates anticlockwise on the A10 and clockwise on the A65.

A65 tacho was magnetic type.

[chaterlea25]

Hi All,
Julian, The RC1303/03 for the Super Rocket should have a "L" at the end, so RC1303/03L
to signify left hand rotation

or am I talking cr*p

John

[JulianS]

Certainly seen an L suffix on speedometers but not so far on a tacho.

[chaterlea25]

Hi Julian
Maybe/probably that's what I was thinking of 
Although I am sure that the oil pump driven rev counter is opposite to "usual" rotation

John