Montesa

I have a Montesa Cota 248 trials bike, frame number 21M51469 and am trying to find the age of it. Does anyone know how to age this?

Hi all, Bought a 2016 300rr and the dealer put 10w40 tranny oil in it. Not Elf. Took for a practice. Felt fine until hot-hot and then refused to find any gear except the one it was in, had to turn off or wait until cool. Prefer not a light-switch clutch. What was the decision after the past decade since people chatting GRO?

Hi all .. I've managed to almost resolve the clutch issues.. but I've noticed the back cog for the kickstart gear ⚙️ is very damaged And no longer meshing looks like the circlip was never replaced 🤦‍♂️...how do I get it out? It's behind the gear selector finger ! Do I have to remove the whole gear selector shaft or is there an easier way..

Hey everyone, just a question about can I fit a decompression kit to my 1985 Montesa 304. Cheers from Australia.

Anyone still alive on here that has any information on the clutch assembly? *******o clutch will not disingage ( stuck in gear) all gears selectable... Have soaked the basket in petrol and doesn't seem to be sticking.. really need an exploded diagram as I feel a crucial part maybe missing.. engine was rebuilt by someone else.. even the tiniest information would be great 👍

Hello everyone, I have a problem with a 2005 Cota 4RT. After 10/15 minutes of riding, the bike shuts down, it seems to be a lack of fuel supply. As soon as it happens, I remove the spark plug and find it dry. After this, the bike starts up again immediately but then shuts down again after a few kilometers. I have replaced the fuel pump and filter, but with no results. When the engine is about to shut down, if I pull the clutch, it does not shut down, so in neutral position the engine runs well without issues; as soon as I shift into gear and increase the revs, it starts to misfire until it shuts down. Has anyone ever had a similar problem? Thank you for the help!

Hi, so I am an absolute beginner but I don’t think it’s me, I struggle to find Neutral to the point that I sometimes use my hand I also feel like I have clutch drag and wonder if I should replace the clutch with a Mitani ? I have changed the gearbox oil with the correct Elf oil and silkoline for engine both were Dark

Hello, Are there companies making a racing wire loom? I know future used to make a very minimalistic wire loom for 4rt's but they are no longer doing that ? What can be taken off the bike ? i have seen some monts where a lot of those rubber tubes and catch tank and other stuff have been taken off so you get some space to work on the engine . I have seen smaller HT coils and smaller condensors beeing used to

Looking to service a 315r which runs great, anything I should be looking out for or giving special attention? And how do you figure out what year they are? Any manuals for the bike would be useful. Any pointers for coolant, gearbox oil and brake/clutch fluid (dot 4?). How often should the steering head and suspension pivots be stripped and regreased?

The manual shows 15 hours as the oil/ filter change interval for a 2018 300. That sounds like an MX bike. Meanwhile, the Beta 4T manual shows 40 hours. What interval are people using?

Hi, I have a NOS exhaust pipe for a Montesa. I bought it for my rebuild (1979 Cota 349), however, when I came to fit it, it wasn't right. The part number on the expansion is: 2180 03803 or 08808 (photos attached). Any help would be appreciated, thanks.

My tank leaks very slowly at the bottom, wondering where I can find a suitable replacement, it isn't listed separately in the parts manual. I see the newer cotas use two o-rings but I don't think I'm that lucky.

Does anyhone know anything about the 2025 4ride? I have a '16 that i absolutely love, and fancy treating myself to a brand new one. A few UK dealers don't have any 2024's left in stock, and they are waiting for the '25 model. I've no idea what (if anything) has changed.

Hi, I am new to trials I have a very lightly used 4rt I would like to keep it as good as possible 😂 I currently have the standard sump guard with a wrap around water pump guard I am looking at guards from CSP, S3 and MITANI (full protection kit) I also thinking I will buy a linkage guard any advise appreciated. thanks

I have a 2018 300 with black throttle tube. It looks just like the 2T throttle. Is a slower one available? I have a 2016 Beta 300 4T standard model and the throttle has much more resolution for small blips, maybe 100% more resolution that makes throttle control much easier.

I have a new Montesa Repsol which is losing 100ml of transmission oil per ride from the clutch/gearbox into the engine oil. I’ve drained and measured the oil levels to confirm this is happening. I know it’s a warranty issue but I live hours away from the dealer and I’m looking for a fix to keep riding. Does anyone have experience with this? I’m thinking it’s a faulty crankshaft seal?

Evening all, Looking for some advice / images on how to clean up and strip out some electrical excess bits from my new Mont. There are various forum comments and suggestion online on switching some bits out, but I can't find a simple/conclusive summary? From what I can tell: - Remove catch can (not sure on what to do with the vent hoses) - Remove Bank Angle Sensor - Smaller Condenser - Carbon reg rec bracket - Consolidate earth wires? If anyone has any pictures or clear instructions, would be very much appreciated! Thanks, Scott

Hello, has en anyone converted his/her montesa 4ride onto a 4RT full trials bike? If not can someone tell me what parts i need to do this? I myself was thinking of a different front fork and adjusting the rear suspension as well as the fuel tank and rear mudguard. Greathings, Luc

Hoping someone can help me find a front exhaust pipe for my Cota 248. it came as a box of bits and I have gradually rebuild it from the ground up. The original 21M engine had a missing RH case so I rebuilt and fitted a 51M 349 engine. Just dropped the rebuilt engine into the frame and discovered the 248 front pipe will not fit the 349 barrel. The port stud spacing and port bore are all the same but on the 349 barrel the exhaust port is more recessed and at a different angle to the 248 barrel. I am told that the correct part number for the exhaust I need is 5160038-02. I have tried my usual suppliers (InMotion, Cycles Avent) but they can't supply either new or used. …

I got out for a ride on a new to me 4RT and it is quite different from my Beta 300 4t. This is a 300RR version, 2018. Power is much sharper than the Beta but it seems like power is cut much quicker than on the Beta. The front wheel really slams down on the backside of logs, even a small 10 inch diameter log.. I tend to double blip most any obstacle. I'll do a second blip when the tire is on the front of the log or on top, chop the throttle, bikes roll over and set the front end down. This 4RT just drops the front wheel like a rock hitting the ground pretty hard on the back side. I'm wondering if this is the way fuel injection works or could it be something else. …