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Norton Laydown gearbox G102 for Norton Dominator model 88 / 99 with twin cylinders.
These Norton gearboxes are shrouded in speculation and mystery with regard to precisely which model they are for. It seems that even the experts have different opinions.
There are a variety of stamps: G100, G101, G102
The last numbers are the sequential numbers and provide a guide as to which year they were produced.
There are three different lengths of mainshaft and the dimensions of the lugs should be noted.
Laydown gearboxes were supplied on Nortons until around 1956.
So, here’s my best stab at identifying which bikes this G102 Norton laydown gearbox is for. Generally accepted opinion is that G102 is for the pre-featherbed twin cylinder models. (G101 is for the pre-featherbed singles). Going by the sequential number, I’d suggest that this gearbox was supplied around mid 1955.
If your bike falls into the pre-featherbed twin category, then we need to double check on the widths of the lugs that you need.
The dimensions of the mounting lugs on this gearbox are:
- Top lug width: 84.3mm
- Bottom lug width: 88.5mm
I think there might be some shims involved, so allow for that.
This gearbox: Well I haven’t tested it in a bike. It turns by hand without any horrible noises. The mounting lugs are good. The casing has has some trimming (or repair) as shown in the images and the inspection outer cap is missing.
It’s cheap for what it is, if you accept that this is not a rebuild gearbox.
International shipping available. Please ask.
Viewing: Please come and check it over before you buy. It is at PE28, near St Ives in Cambridgeshire.
Shipping: I usually ship to most destinations. If you don’t see a price, please ask. Thanks. International shipping available.
Collection: If you don’t want it shipped, I have plenty of space. If you can’t collect for a while, it’s not a problem. However, I will need to be paid very soon after the sale. Thanks.
Payment: Good old fashioned money on collection is preferred. I can accept payment through PayPal or by bank transfer as well.
Import Taxes: Please note that IMPORT DUTIES are not something I can control. If you are buying from outside the UK, there is a chance that you will have to pay import taxes. Import taxes vary from country to country. If there are charges to pay, it is the buyer’s responsibility to research the cost and pay the duties. The price that you see on my advert is for the item and not the item plus whatever taxes might be due.
