The long road to reliability

[gold33]

Just discovered more issues to resolve before the next trial run.

The new rings as fitted by P.O are upside down, the 3 new valves (as described at time of sale) were new once but not recently, and the new gears on the oil pump are too tight a fit with the old worn ones and have destroyed the worm drive. Oh and the rebuilt magneto has excess movement around the bearings.

Am now looking at a rebuild of my own; question, do I rebuild/replace the existing oil pump or fit one from a later model, an A65?
I now have an extensive shopping list and any suggested upgrades would be welcome. 

[MikeN]

I think im right in saying that an A65 oil pump is different in the body (stud hole positions)to an a10, However, the new oil pumps manufactured by SRM (the blue anodised alloy ones) are fitted with the wider A65 gears and are avery nice job, as you would expect for that sort of money.They also come with the rev counter drive fitted as standard.
Mike

[trevinoz]

I feel that the early A65 pumps are the same as the A10 but with a different drive end. The gears are certainly the same.
The late ones have wider gears but should work well in an A10 with the A10 drive end fitted.
Trev.

[bsa-bill]

I bought what was supposidly an A65 pump but it is longer than an A10 one, any idea what it's off

All the best -  Bill

[trevinoz]

The pump itself is the same but the drive end which is bolted on is different. Post a picture of your pump.
Trev.

[gold33]

I'm back.
Been away, then moved office.
Trev, I tried to upload a couple of photos but no success.
I discovered my exhaust valve springs have no seats! sent a text to PO who has found a working pump for me and a contact of his who has valve spring seats and hopefully 2 new exhaust valves.

Once these parts arrive I expect to have many questions but at this stage all appears to be well.

adm edit: picture post info see here

[gold33]

Testing...
I think, with help that I have attached pictures of my oil pump.
The replacement sent to me by PO is the wrong type, not only does it have the drive for what I assume to be a tacho the mounting hole at the worm drive end is different.
Once I have a working pump I can start re-assembling.
I was told the new piston may be from a Road Rocket; is this a potential problem? what does a Rocket piston look like compared to a std A10?

Darren

[chaterlea25]

HI Darren,
Can you post comparitive pictures of the different pumps?
Having a rev counter extension or not makes no difference to the fitting of the pump
HTH
John O R

[trevinoz]

Looks like the right pump to me.
Trev.