Montesa 4rt. will it run? trials bike starting nightmare! honda montesa cota 4rt

Pulling the montesa 4rt out the back of the workshop. Try to get this trials bike to start! Will this montesa 4rt start. honda trials bikes! I thought it would be reliable.....
#montesa #4rt #trail #trailbike #startup #start #motorcycle #trials

[@montesamapping]

Suggestions: - change spark plug and verifyspark cable, in video is not clear if the spark is happening - open fuel tank and verify pump filter (if dirty may cause serious problems) - verify fuel pump is running properly as you kick (with open tank and some cabling) - use 100 octane fuel, before totally empty the fuel tank - open 1... then 2 rounds the minimum screw - be sure the lights are off (they absorb energy necessary to the pump) - use a long descending to start the bike in 4th gear - after a kick immediately open the throttle to maximum for 1 second (this reset the ECU) - after some attempts wide open the throttle durin 1-2 kicks, then leave it closed for the next or slightly open As I wrote before in my really long Montesa 4RT experience following those advices it should start in the end... otherwise something is seriously broken. Good luck!

[@losttheplotcolin]

My idle varies often. I put a hour meter / tach on it. Somedays its 2 or 3 hundred rpm low, others its high. I cut a slot in the plastic, and carry a screwdriver, so I can adjust it without taking the fender off. When I ride in the mountains the idle drops with altitude. The throttle body will get carbon build up and also the hole for the air screw. Hope you get it figured out.

[@Supercarlsunday]

Thank you 👍

[@montesamapping]

I had a 4rt 250 and started always within 4 kiks. After that I own 4 Montesa (elaborated 290, 300 and stock 260 301) and had only occasionally some problems...I think no more than 10 times in 15 years driving for 300 hours or more each year ! I always user 100 octane gasoline, good ECU mapping, appropriate spark plugs (not too old), appropriate minimum rpm value (too low gives starting problems). Sometimes is useful to slightly open throttle to favourite starting. For sure sparking has to work, once the cable was broken making a false contact... so it works on engine started, but not in starting it !

[@Supercarlsunday]

Hi. You do plenty hours riding then 🙂. The bike has always been good buy for some reason this time does.not want to start. I'm going to get parts to service and I will check fuel pump on tank and do valve clearances ect. I only use good fuel, I won't use the cheap crap in anything I own. Thank you for your input. I will do update video soon. 👍

[@normanchoy4075]

Hi, assuming this bike is stored for many years. I do have 1 of 4RT 250cc as an early edition with frame #1005, currently it is still my main amigo for trials. My suggestion is to remove the ECU but not overhaul, spray CONTACT CLEANER to clean like you clean the normal caburetor. check the throttle cable with over 3mm free play, when you start the engine, DO NOT REV, rotate the engine by press the starter smoothly till you find a rebound compression, then leave the starter to fully rebound, then full kick start, see how it works

[@Supercarlsunday]

Hi thank you for your comment. I will try cleaning the contacts on the ecu and the connectors that go to the throttle body. I have already tried all options with the kick-start. Tried the ecu reset by turning the engine over three times with throttle wide open. Nothing. I will check the throttle cable as mentioned. I will do another video when I resolve the problem 🙈

[@losttheplotcolin]

make sure there is free play in the throttle cable. turn the air screw out 1/2 a turn. there crap to start, even when all the stars are aligned

[@Supercarlsunday]

Yeah, I checked the throttle cable. I will check air screw. Its always been o.k to be fair but then all of a sudden does not want to start. Probably wants a good service. Hasn't had one for a while. I will do an update video when I have another look. Been busy with accident damage work. Thanks for your input and please subscribe for a chance to win some merchandise in my Christmas draw.

[@gojcspc]

Pilot jet needs cleaning probably the rest of the carb too...

[@Supercarlsunday]

There injection!

[@user-rv4xo4xm9v]

Check the ba k angle sensor is OK and then reset the ecu keep throttle fully open slow kick 3 times then will be good to go

[@Supercarlsunday]

I've done the slow kick thing everal times. What do you mean by the ba k angle sensor? Thank you

[@user-rv4xo4xm9v]

There is a little black box under the air filter that has a magnet inside and for if the bike flips padt a certain angle it cuts the bike put and will not start again this is alot of people bypass the bank angle sensor on 4rts. This happend to me on mine it would not start and it was the magnet in the bank angle sensor that had stuck so we had to bypass it and it was fine from there on in.

[@Supercarlsunday]

@@user-rv4xo4xm9v O.k thank you, that sounds really helpful, I will have a look in to this 👍

[@russellferriday8191]

I have a 2007 Beta 250 4stroke. . same problem just nothing will get it going. . Been in my shed over a year now since I last gave up on it. . .

[@Supercarlsunday]

What a nightmare 🙈. You know when you just want to get on something and ride. If you have seen other videos on the channel you will see I have been building bikes and repairing them for customers for some time but its handy to ask around if your not familiar with a simple fix. I was hoping it would be some kind of cut out that I could reset. Probably going to strip the throttle body next. They do pack up. Replaced one on a scooter once. That was a honda. Wouldn't go. Replaced throttle body and off it went. Check timing as well. Although I'm not expecting any problems there to be honest but you never know. It could even be something as simple as spark plug breaking down.

[@garyvause2475]

Try fuel pump in tank

[@Supercarlsunday]

Yes its on my to do list. I've been so busy lately with other projects and customers work. I will drag it out soon. Thank you 👍

[@elmarheuer-vonruden1193]

Hi, i looked to the video, sorry, i couldnot see a spark at the sparkplug? Did you have one? Did you have enough play at the gasthrottel? Its important.

[@Supercarlsunday]

The spark plug is the first thing I checked! Working on bikes over 30 year it comes as second nature.. The throttle is the same as its always been.

[@Kebekwoodcraft7375]

It’s not because you see spark outside it’s spark inside with the compression need a spark tester 😊 if don’t start with ether no spark 🧨 😊 Why the timing will change if it was running last time non sense 😮

[@Supercarlsunday]

@Kebekwoodcraft7375 look out for the next video 👍

[@Trapping202]

you dont need to kick those bikes hard btw you can little just lightly push down

[@Supercarlsunday]

Yeah when there right 👍

[@Trapping202]

very true but if it doesnt start with thottle fully open really slow kick then a little prod kick the bike most likely wont start anyway @@Supercarlsunday

[@Supercarlsunday]

@Trapping202 O.k I haven't had a proper look at it yet. It does need a service. Valves checking ect. Not had time with other commitments. I will get on to it soon and do an update video.

[@paulfeatherstone7095]

Hello looks like you are going to have to strip down the fuel system again like the other projects you've done 👍

[@Supercarlsunday]

Hi Paul. Hmmm I have been fearing this lol. With it been injection, its usually something needs replacing because its packed up lol. I'm not sure if there is some kind of fuel cut out. I need to speak to people that own one really. Have to see if there is some 4rt groups.

[@paulfeatherstone7095]

@Supercarlsunday yes good idea if you can save a bit off time mate 👍

[@Supercarlsunday]

Thats it. I have plenty other things to be getting on with don't I lol. I was a bit gutted, I just wanted to get it out and have a ride lol. Never mind.

[@paulfeatherstone7095]

@Supercarlsunday yes you're always plenty to do I it's a shame but you will sort it soon iam sure !

[@Supercarlsunday]

Thank you. Should have a video up later of the mercedes repair. What a job I had with that in the end 🙈

[@OKFrax-ys2op]

How many hours on the bike?

[@Supercarlsunday]

I have no idea. Probably a few the age of it. I.m going to give it a major service inc valve clearances. It may be fault with fuel pump in tank, I have a few things to check yet. I've been sorting other things.

[@user-zq4zr5hs6j]

Try bump start

[@Supercarlsunday]

It won't bump start. It should just kick up. Do you own one of these bikes?

[@huntinggreys2484]

I've got 4rt and with mine I very very slowly push kick start down to lose compression then kick slowly down with no throttle, Mine want start if I kick hard or quickly just a even slow kick,worth a try m8 good lucky🤞🤞