feetupfun

Maybe that's not the reason he hasn't replied yet

Measure 10 pitches with a mm rule and divide by 10 to get mm pitch

If that's the original seat/tank unit, it's the last version of the Cota 247. I'm thinking it would have been made around 1980. Here's something to help you with ID http://www.southwestmontesa.com/modelyear.html

If you have got it, why can't you measure the pitch?

It's normal to release the brakes to take the brake plate out of the hub. You don't have to take the chain off the bike but do need to take the chain off the rear sprocket. After you undo the axle nut and the brake link, slide the axle forwards to slacken off the chain tension and it will usually come off the sprocket. I see at least one missing rear wheel spoke. Yes it's common to fit a tube in a tubeless tyre. That rim/tyre combination won't hold air pressure without a tube. You will need to set the wheel alignment and chain tension when you put it back together. You can make a mark if you want, but are you sure it is set right at the moment? That dodgy-looking brake return arrangement is to stop the brake sticking on so you may find that there are problems inside the brake hub that are causing it to stick on (missing/wrong spring, worn linings, worn brake drum). Looks like someone has extended the length of that brake arm too.

If you google search "Cota 247 images" you will find plenty of photos of what yours originally looked like. Some things that will enable you to tell your model from other 247 models are: Your model fuel tank is more bulbous than later models. Your clutch arm is under the motor. Later it is on the top. Your fork sliders have a distinctive large diameter section at their bottom end. Your intake tube is much longer than later models. Your rear brake pedal is on the left. Later it is on the right. Your shift lever is on the right. Later it is on the left. Your bike may have had a later model front wheel fitted. Hard to be sure of the rim type in that photo.

Nice bike. It's an early model 247 but not the first model. Great to know that it is going to be ridden. A friend of mine Paul Walker rode one of these in trials back in the mid 1970s. Being 5 or 6 years old, it was regarded as an old trials bike at the time. So far it has been the only one of that type I've seen in the flesh.

It's a standard work-around for a failed thermostatic switch, which is a pretty common thing

Pretty easy to do a test fit with the clutch in place to work out which pushrod it is. There should be a ball between the mushroom ended rod and the plain rod. Some else's 104 pushrod length won't help you because yours might have a different clutch.

Cota 247s are not popular in vintage trials competition nowadays but are great to look at. It's harder to find parts for them than for the popular vintage trials bikes because not many were sold at the time. They are nice to ride though. If you want to ride something different to others, they would be a good choice. As for being a 1973 model, the 247 model had very little product development after 1970 so a 1973 is as good as they get. The early models 1967/68/69 are rare and desirable but not as good to ride.

I still use the original type and reckon they are fine. In fact it is still the original lever on the bike. I've got others too but am even further away than Guy

The square float bowl AMAL concentric came out in about 1977 and Cota 200 was something like 1981 so based on that it would have had the square type. As far as I know the round bowl type is Mk1 and the square bowl type is MK2. This photo shows a Cota 200 with what I call a Mk2 AMAL carby

Is the reason you want an aftermarket lever that you don't like the original lever or you can't source one?

You can ride a twinshock in any competition. Lots of us do that for the same reason as you have mentioned. There are mild modern bikes though if you want to ride something new. The Beta 4 stroke 300 is a popular older person's modern bike

5 speed is standard for model 92

You didn't mention checking for: Fuel tank venting issue Fuel tap filter flow restricted Fuel hose kink Fuel hose filter restricted Fan not running Fan running too slowly Radiator airflow restricted Leaking connector carby to cylinder Air screw/idle fuel screw set incorrectly Exhaust flow restricted Is it the Sherco model with the fuel lift pump?

The usual thing with those carbies is that the needle jet wears alarmingly fast which makes it run rich just about everywhere. They also suffer from the jet needle wearing and the slide wearing and the body wearing. Have a look through the needle jet and I wouldn't be surprised if the hole is elongated rather than round. The jet sizes sound OK but you didn't mention the needle size. OKO. Keihin, Mikuni, Dell Orto all make great carbies for your bike. Bultaco with good carby and good ignition = fun times

If you become a site supporter you can post as many photos as you want

I've been using sealed bearings in motorbike wheels for many years so don't usually fit new seals but do find that with some wheels it is helpful to have something to hold the spacer in position while the axle is being inserted. If the old seal is beyond reuse on a wheel like that, I usually make a rubber disc that fits where the seal would normally go, to hold the spacer in place. PS your wheel looks excellent

I wish your model 27 was for sale in Australia

The most recent fork work I did on a Bultaco included green SKF seals with spacer rings I made from PVC electrical conduit (in a model 49 Bultaco). I wouldn't normally bother with fork seal spacer rings but the seal seller told me that the SKF fork seals are more prone to moving within the slider than other brand seals. I found the SKF seals do function exceptionally well.

The rolled over version is clearly shown in sales brochures so there should be no doubt that both versions were standard for the Cota 200

It would make it easy to ID if you post a photo of it

Those things are preload spacers. You can adjust the spring preload by fitting more or less of them

Complete bike not running. Some important parts are hard to source. Insufficient information of mechanical condition. $500 max in my world.