1964 Electra Engine Specs

Maybe I'm not looking in the right places but it seems that Electra engine specs are hard to find. Does anyone know what the crankshaft rod journal diameters are?

The Electra is basically an enlarged version of the Navigator 350 cc. You will find a lot of data in the 1960-70 Twin workshop manual:
Amazon product ASIN B01MZBM0IN
If you are lucky you may find a genuine NV printed sample offered on Fleebay.

A scanned copy can be download here:

- Knut

Knut,
Perfect, much obliged! One more question, are parts such as bearings, valves etc. still available? I just inherited this project so the learning curve is steep. Interesting little bike...

Ktrip

Ktrip,

I can't say as I don't own one, but there are reports of the small twins being restored in the UK, so I guess most wearing parts are available or similar parts can be made to fit.
The usual sources for engine parts in the UK are Norvil, RGM, Russell Motors, Alpha Bearings, Burlen Ltd., ....
Ball and roller bearing sizes will be metric I guess and should be easily obtainable.
Camshafts, cam followers and rocker spindles will likely have to be refurbished or re-made.
Some engine parts may be shared with the heavy twins range, and for these, Andover Norton is your premier source. You need to go by the 6-digit part number (use a conversion list where necessary).
Primary drive and transmission were shared with other models of the AMC group (i.e., Matchless G2CS, G5) and for these parts, the AJS/M Owners Group run a comprehensive spares operation. AMC Classic Spares may also have some parts.
Otherwise, you need to scout eBay for good s/h parts.

When digging deep enough, you will probably find a specialist in the UK specializing in these models. I suggest you contact the NOC (Norton Owners Club) for guidance. Have you searched this site? Member "Clinton4641" owns a Navigator and might provide some leads. You should also read the restoration report by german member "rivera".

Good luck with your project!

- Knut

Ktrip
I just checked my J. B. Nicholson copy of Modern Motorcycle Mechanics (1965 printing, it was my dad's). For the 350/400 twins, it says; "Crankshaft big ends - These should be measured with a micrometer when overhauling. Standard dimension is 1.5000 - 1.5005. Regrinding and fitting undersize shells is recommended when maximum wear is .003 or more. I'd be glad to scan the Electra section and the 350 - 400 twins section and email it to you, just send me your email through a private message. I know the INOA has a lightweight guy who is the local stateside expert, contact Suzi Greenway suznort@juno.com from INOA for his contact info.
Dave

Have you already got the Twins manual?

http://www.classicbike.biz/Norton/Repair/1960s/NortonRepair1960-1968.pdf