It’s the compression ratio 10.5 it’s just how the person has stamped it.

Hi Greg
This is the same tyre we’re talking about isn’t it

“TRIALMAXX M7319/M7320
This trail-riding motorcycle tyre is designed to provide grip, comfort and reliability to trail riders everywhere.

A hybrid between trials and enduro
Perfect for green-laning
Designed to provide grip on a wide range ...

I thought the standard for a trials tyres was adopted internationally 50 or more years ago.
The reason for the ruling was, to satisfy landholders that generously allowed trials to be held on their properties, that ground disturbance would be kept to a minimum.
That’s why the trials universal tyre ...

This weapon looks to have the same frame.I like how the side over has been trimmed to show off the frame and top shock mount

I like your frame David nice find.
Would that frame have been a replacement for a m125/151, did any soler models have homelite tank/seats in the UK.
Has your m80 tank side panels been cut to fit a m49 air box

Here’s one on eBay
https://www.ebay.com.au/itm/BULTACO-LOB ... Sw1AleqRZ6

I think that’s a mk4 or even maybe mk5/6 Lobito rear wheel they had the solid aluminium hub
A m99 has a bolt on spoke carrier or should do
https://www.uniquemotorcars.net/Bultaco ... -model-99/

325 Cylinder rebored with new piston and rings! Can someone please identify the 2 different triple clamps and which model/s they suit?
Left normal clamps 124/125 onwards, right 158/182/190 clamps for the short forks I think
Early 325 barrel and head
You must have won the lottery buying all these parts

Hi Greg I measured my 183 swing arm 415mm centre to centre the axle is 10mm back
From some books I’ve looked at the 250 swingarms appear to have stayed with the older/original shock mount but the 350’s from 183 on have the square type mount to accommodate pillion pegs !!! So the swingarm on your ...