2 hours ago, Gr33ves said:

Hello all,

Been involved with motorbikes for over 40years. Looking for tips and info for Pre65 bikes.

It's cheaper to buy one than to purchase the parts and build it yourself 😁

https://www.trialscentral.com/forums/topic/30515-cota-348-h…

have you looked through these ?

http://www.ratiopublishing.co.uk/The-Rupert-Ratio-Unit-Single-Manual-Volume-1

2 hours ago, Lee halsall said:

Do you know of hubs in the same condition as mine lasting a few years ?

I believe the quality of chrome was inconsistent, some flanked off within months. Keep an eye on it, it may be fine. 

Run the front hub as it is, but check it regularly. The rear hub would have been chrome too, and has been relined. Inmotion used to do it, not sure if they still do.

IRC tube type is a very good so round tyre, perfectly suited to twin shocks. Don't worry about whether it's suited to complement the front. 

8 minutes ago, JonnyWobbles said:

So the saga continues!

Armed with a new set of points from InMotion, I set about sorting the timing to the Bultaco procedure other than using a multimeter (on beeb) connected to disconnected black wire and earth, dial gauge through plug hole to set TDC etc.

First problem was setting points gap to 16 thou. as the hole in which the screw cam adjuster works on the points is too big and significantly bigger than original points. Eventually managed it by levering with screwdriver. Second problem, impossible to set timing to less than 5mm BTDC as there was insufficient adjustment on backplate slots! 

Comparing points seems to explain why!

The angle and length of the insulated cam follower on the InMotion points is totally different compared to the ‘original’ points (fitted to bike when I got it) and a set of points I bought from F’ecked which themselves are faulty as the welded contacts are intermittent! I think a couple of mm and approximately 30 deg angular offset is not really acceptable if these are the supposed to be compatible!

So for now I’ve put original points back in (contacts are good, but cam follower looks worn) and set them up to 2.5mm BTDC with none of the problems above. But I’m really not impressed! No wonder it’s difficult to get these bikes running correctly if the quality and specification of the current points available is so poor!

I ran out of time (and patience!) so not put it all back together. I don’t think that the wear of the cam follower should affect the timing once set correctly, but I’d really like to replace with a ‘proper’ quality set if anyone knows where I can get some! 

Anyone want to buy a Sher

 I don’t think that the wear of the cam follower should affect the timing once set correctly, but I’d really like to replace with a ‘proper’ quality set if anyone knows where I can get some!

Ware will affect timing, and the points were always poor quality.

20 hours ago, Mark Wall said:

Hi is the rear mudguard still available please, sorry just seen the messages.

Thanks Mark

Richard Allan and Jim Williams were doing a glass one. Later mono ones are very similar, but narrower.

Doubt it will stay on the rim without resorting to cutting it.  

17 minutes ago, lsv said:

Falcons and NJBs are both great - Rockshocks just bling IMHO.................

Define "bling"

7 hours ago, haggetty said:

Yeah, that’s my plan. Dave Cooper rack for the trials bike and a Motolug trailer with the big V-Strom on it. (On a 1.4 VW golf)

Check towbar and car specs , I'd be very surprised if this is legal and in the event of an accident may invalidate your insurance.

Check your getting a good flow from the tank as it could be debris in the tank.

Speak to people in the area with trials bikes and find a mot test station that understands trials bikes. Agree with everything above, also check wheel bearing have no play, spokes all tensioned, swinging arm no play, steering no play but adjusted to move with no resistance. You do not need a reflector, but stick one on. Tyres should be properly inflated (not trials pressures) no cracks or signs of deterioration, directional arrows should be correct orientation (or removed) 

@Mrploppy

1 hour ago, Mrploppy said:

Look good, I’ll give them a go.

thanks so much

Worth checking if it's already registered, DVLA have / had an off road registration service so your bikes on the system of it gets stolen. I used this on another bike and discovered it was already registered. I got the original number back for £25.

https://www.dvlaadvice.co.uk/about.htm

I have used this company to get an age related plate. They are based on Bristol.

 

2 hours ago, Tillerman6 said:

 

They don't look like deep scratches. Anyway- from now on I will throw a wide rag over the head any time the spark plug is removed.

 

 

Cut down an old plug and use it to block the plug hole.

I'm curious how you know you have a 50% contact ? If you have stripped the cylinder off to check, what symptoms prompted this ?

Personally, on an engine of that era, I would only ever use semi synthetic at 50:1.

Generally once you have used about 5l of fuel, the piston should be fairly bedded in. 

2 hours ago, pschrauber said:

 

Don't ask why it happend and how it just showed up and starting backwards was the main issue. 

I believe any dampness in the timing cover causes slight rusting on the cam, this quickly wears the heal of the cam throwing the timing out.

2 hours ago, haggetty said:

Any brave souls care to declare their laziness re oil changes and the effects thereof?

I mean, what happens at 30/50/100/oh Christ I’ve never changed it, real life scenarios?

I changed the "sealed for life" gear box oil in a vw at 100k miles, and it looked fine ..... 

Atf in clutch is good, not sure of quantity .

Virtual all clutches do this, type and quantity of oil has a bearing, but it is normal. Lots of different ways to free it off (and it will free off 99% of the time) Mins is start and warm engine,  have plenty of space, push bike and slip it into gear, ride around with clutch pulled in. Maybe a bit of back brake too.

On 3/12/2021 at 12:43 AM, haggetty said:

I’ve justIfied it with ‘man maths’ and even the Mrs is onboard! Winner. 

😂😂😂😂 we've all been there.

 

On 12/9/2013 at 6:38 PM, baldilocks said:

Clutch side weight is 1.6kg so pick up is improved with it off. Still seems to grip ok and im still yet to stall it in the approx 6 weeks I have owned it ! Love it

600g's, just cheched. 

7 minutes ago, Lee halsall said:

I have been searching for blank nipples and I can’t find any manufacturer in UK .

Due to the brexit bolox buying from outside of UK won’t be cost effective and although my spokes are perfect , the cheapest option might be new imperial spokes and nipples ... unless anyone knows of a better way???

How much has brexit added to the cost ?