18 hours ago, dannyb said:

Thanks for the help and the info. I found i had one of the cheap tachs already in my toolbox so hooked it up to see what it read. It appeared to be a little high so turned the idle down a quarter turn.

One thing i noted is the readout (digital) fluctuates a little as the bike idles - is this normal? Mine as currently set, reads 1800 but will flick to 1680 maybe once every 1 or 2 seconds?? 

I don't think that's unusual.

We just used to cut some sheet alloy to suit when shimming the 348 to take Renthals.

https://www.trialsuk.co.uk/Apico-Handlebar-Riser-Kit---Fatbar-28.6mm

I used these on my 4RT, I think they do a set for 7/8 as well.

You need one that senses the pulses in the HT lead. The one pictured needs sight of a rotating flywheel.  The small ones (matchbox size) from China last about a fortnight. I got one of these but it only lasted a few goes  https://www.machinemart.co.uk/p/draper-automotive-tachometer/   

I do find the speed can vary during an event and it does rise when the fan comes on.

As a by the by, if you find it hard to adapt to the fast tickover you could lower the gearing. I went to 9 teeth on the front but that's a bit cruel to the chain so went up two teeth on the rear instead when replacement time came round and find that a good compromise on my 250 (I'm not one for using the clutch all the time).  When I briefly rode a 260, although the gearing is the same as the standard 250, it felt to run a bit slower as if the gearing was lower - I can't explain that.

 

I got a pitbike seat for a fiver at the scrappy to use on my 4RT. You should be able to rig up something similar.

11 hours ago, martinsyderob said:

You can't leave it like that! Where can I find more out about this bike? 

I only recall it being pictured, with some details, in the trials column of the Motor Cycle but can't remember hearing anything further of it, so can't say who rode it or how well (no doubt somebody can).  Memory was stirred during discussion about the Emme which a pal had just seen in the Neckarsulm museum. Emme

That'll be it, thanks.

Can anyone remember who made that Bantam engined bike that used the frame as the exhaust pipe? Probably in the late Sixties.

1 hour ago, sportsawyer said:

Sounds like Up and Over Trials. Nice pants, but they'll melt on headpipes like other brands.

That was them.

A couple of years or so ago there was an American outfit (can't recall the name) producing plain coloured trousers of a more seemly cut for the mature rider but I am not sure what material was involved.  Are they still on the go?

3 hours ago, Crazymac680 said:

Thanks guys. I gave up on the top of piston to top of cylinder measurement. A face book user thinks that measurement was for a flat piston while mine is dome shaped. 

Once I stopped trying to change gaskets, to chase that measurement. I installed everything stock and measured squish at 1.8mm. As I'd just spent the night researching squish. This seems like a safe distance to start with. Most of the research I did, stated that Between 1 at 2mm would be your tuning zone.

Under 1 would be dangerous as my piston expand up 0.7mm when hot.

It's a shame beta don't have a book measurement to remove any confusion.

 

Beta don't even have a book measurement for ignition timing, so are unlikely to see squish as an important piece of information.

£40 more than just the seals sounds infeasible, but £200 to change seals is somewhat OTT I would have thought. I would expect RYP website to have a video but Sherco owners may give more detail.

I don't know how you would get in touch with him but John Rushworth (presumably still resident in Scotland and still in possession of one of these bikes) might help. I know he had some involvement in trail riding so a search on such websites might produce his info.

1 hour ago, rusty ken said:

I don't know my trials history particularly well, but understood that Greeves was one of the preffered trials bikes to be riding in the late 60's ( or was that just the publicity) 

Pre 65 trials seems to have  gone rhrough a series of fads over the last few years moving from pre units to Cubs, Bantums, James, and Triumph twins. 

Is there a reason why Greeves appears to have largely dropped out of fashion and not been "modernised" like some of the other makes?  There seem to be a few still being riden in the big events, but not being developed to the same extent as the bantums etc?

Does this mean they could be the next big thing, or was most of the development already delivered by the factory in the '60s?

Not so easy to modernise the steering head angle on a Greeves?

The bead of a tyre can't be stretched - it can be permanently distorted if brutality is employed. So the answer to your question is, do the job properly and it can be done as often as you like.  I always turn them but find the trailing edge never heals and stays rounded ? so turn once only, though I will admit to more than once on occasion. I did once use a Stanley knife to recut (ok, I know that's agin the rules) a crossply but it wasn't worth the effort.

Being a "trials scrambler" must give it some rarity value?

17 hours ago, motosolex said:

Hi FeetUpFun. 

When timing my TY250, my dial indicator is too large and won’t function due to bikes’s frame with tank off. 

I am thinking I’ll need to remove the head and make a gizmo-bracket to mount dial indicator (as in bike’s shop manual)

Any ideas on this? 

Or do you know of a smaller dial indicator that will work without removing the head?

thanks  

 

 

Do it once and mark the flywheel so you can use a strobe in future.

Try "Classifieds" at the top of the home page.

Probably a bit too old for a "Pre'65" bike then?

Seconded!

Where could you possibly fit the pump and the plumbing/wiring? Can't see any benefit. Bound to be a more costly setup than a standard pump I would have thought.

Are you having problems?

Just let it be known at trials that you're selling - word of mouth can work surprisingly well.

Get the bike supported firmly on a box below the sump then test for play by moving the fork ends by hand.  Easier with a pal sitting on  the bike to prevent it moving and he can feel for play at the bearing.

As far as I recall the UKR was just a "standard" Cota with a stripe on the petrol tank.

It looks like you are not taking the normal precaution of applying grease to the walls of the airbox to trap dust?