paulc76

The crank has a inner bearing race on it you will get a new one when you buy a new bearing so that will not be an issue they can be tricky to get off though and i'm not sure if a standard 241 had that type of bearing from the factory maybe been added by a previous owner, as for the seal face it can be sleeved fairly easily where are you located?

Is the 307 a motoplat ignition? if so try https://uk-motoplat.com/testing/

The easiest and cheapest way is to put a pit of fuel pipe over the throttle cable on the carb end

I Have sent you a PM

Pretty sure they are cycle thread

Paul Dawkins at https://www.motorbikeregistrations.co.uk/ will help you out

Also most of the info you find online is for the more common type of motoplat where the switching electronics are within the coil yours is not this type so the info does not apply

Ok I'm sparking again now stator was bad but had a spare the readings are as follows coil primary 1.5 ohms coil secondary 18.2 Kohms Blue wire to blue wire 281 ohms Black to grey 25.2 ohms grey to ground 107 ohms black to ground 82 ohms blue wire to earth several Mohms so no connection really yellow wire is lighting yellow/green from ignition unit to earth white from ignition unit to kill switch other side of kill switch to ground hope this helps Paul

I am just about to look at one with no spark and i have a running one to compare so will let you know the reading the ignition you have is the type with the separate ignition unit usually hiding between the headstock gussets the coil should be a single wire type 1.5ohm connected to the green wire the white wire should go to the kill switch you should also see a voltage between the two blue wires when you kick it over the black and grey are the trigger wires i'll let you know the resistance once I've measured mine

No worries there are a few of us from the wirral that ride regularly with aqueduct just keep an eye on there website for dates

Come along to the Aqueduct classics trial next weekend you will be able to speak to owners of both not far from you

No Worries I have attached a parts list if you need it Montesa_Cota_348_1978_Parts_list.pdf

Thats normal the conrod thrust is taken up on the small end

What was the conrod you managed to match up?

That means it was manufactured week 24 2017