2shock Posted December 25, 2022 Report Share Posted December 25, 2022 I've got a 2019 Beta 4T that I've had for a while, but don't get on with it anywhere near as well as I'd hoped. It's not as docile as I expected (yes, I'm at the old duffer end of the sportsman class standard of rider 😁) nor very easy to start when hot, and runs very rich. So, I took the carb off, and gave it to my local dealer to check that everything was right - jetting, needle, float height etc. to be sure. I refitted the carb, and it started second kick, then as soon as warm put the choke in, and stood back listening to how nicely it ticked over. Then out of the blue there was a loud 'clunk' from the engine as it stopped running, and now the it won't turn over at all. I can't move the kick start at all, with it having a very solid feel to it. If the difficulty getting the carb off is anything to go by, it's probably a job for a qualified mechanic, but was wondering it this is something anyone else has experienced with this particular bike before I give up, and get expert help??? Quote Link to comment Share on other sites More sharing options...
reggie Posted December 25, 2022 Report Share Posted December 25, 2022 Here is a suggestion. drain the oil to check for anything odd in the oil if nothing take the spark plug out have a look in the spark plug hole next put the bike in 5th (top) gear try to pull the bike backward you only want to turn the engine a very small amount once the engine has turned over backward a small amount try to look into the spark plug hole next take off the water pump cover and make sure the impeller in intact next I would have a look in the clutch side cover I would not suggest trying to start the bike until you find the problem what has happened seems odd GOOD LUCK 1 Quote Link to comment Share on other sites More sharing options...
mcman56 Posted December 25, 2022 Report Share Posted December 25, 2022 (edited) Were you missing any small parts like a bolt or screw when you reinstalled the carb? The fact that something like this occurred right after having the carb off suggests that something could have gotten into the intake port when the carb was removed. Edited December 25, 2022 by mcman56 correct 2 Quote Link to comment Share on other sites More sharing options...
lineaway Posted December 25, 2022 Report Share Posted December 25, 2022 Does the shifter shift? Quote Link to comment Share on other sites More sharing options...
Glayne Posted December 26, 2022 Report Share Posted December 26, 2022 When a 4stroke has a problem it has one! somethings in the way? try rolling the bike backwards in gear, would that free the jam? If it does lets troubleshoot? "i'll guess valves? I know very little of Beta 4t" Quote Link to comment Share on other sites More sharing options...
2shock Posted December 26, 2022 Author Report Share Posted December 26, 2022 When I took the carb off, I put a bung of clean paper in the manifold to stop anything getting in there, and removed it when I reffited it. I've tried putting it in top (it seems to click go through all the gears fine) and turning the back wheel, but can't feel the slightest movement in either direction. The only thing different I can think I did was put Aspen ethanol free petrol in it, because didn't think I'd be using it for a while, and it's not easy to drain any fuel due to the tap design, and difficult to access float bowl drain screw - who thought tucking the screw behind the exhaust where you can't get a screwdriver at it a good idea I wonder?? Quote Link to comment Share on other sites More sharing options...
timdog Posted December 27, 2022 Report Share Posted December 27, 2022 Just for info when you get the engine sorted. It makes a huge difference to how docile the bike is if you fit an amal 80/200 slow throttle. Straight swap but make sure the cable nipple on cam on carb is in the rearmost of the two possible holes. Quote Link to comment Share on other sites More sharing options...
2shock Posted December 27, 2022 Author Report Share Posted December 27, 2022 As I had a bit of time on my hands today, decided to have a slightly deeper look. I took the clutch side case off, to look at the kick start mechanism (which seemed OK...) but put a spanner on the crankshaft nut to see if I could move the piston at all, and heard a slight mechanical noise from somewhere behind the clutch, and also saw the basket turn slightly at the same time. The kick start can now be pressed down by hand, but haven't tried starting it due to not having the any oil until tomorrow. So, it looks like when it stalled, it kicked back and jammed something in the kick start mechanisim. Time will tell I suppose..... Thanks for all the suggestions, and will definitely do the slow action throttle mod Quote Link to comment Share on other sites More sharing options...
trapezeartist Posted December 27, 2022 Report Share Posted December 27, 2022 Before you attempt to start it, take out the plug and turn it over multiple times. Either kick it over, or roll it along in gear. Just in case it locks again. (It seems a little implausible that it would lock once, then free itself and never have a problem again.) 2 Quote Link to comment Share on other sites More sharing options...
2shock Posted December 28, 2022 Author Report Share Posted December 28, 2022 13 hours ago, trapezeartist said: Before you attempt to start it, take out the plug and turn it over multiple times. Either kick it over, or roll it along in gear. Just in case it locks again. (It seems a little implausible that it would lock once, then free itself and never have a problem again.) I agree. And think I'll worry that the same thing is going to happen everytime I use it, if I don't find out why it happened this time. Maybe it's just time to go back to a two stroke........ Quote Link to comment Share on other sites More sharing options...
geeman Posted December 29, 2022 Report Share Posted December 29, 2022 has anyone else used the Amal 80/200 throttle ? if so how do you like it Thanks Geeman Quote Link to comment Share on other sites More sharing options...
carl ekblom Posted January 1, 2023 Report Share Posted January 1, 2023 Not the Amal throttle but a fast (white) Domino. I found it to be too slow. Original is much better Quote Link to comment Share on other sites More sharing options...
trapezeartist Posted January 1, 2023 Report Share Posted January 1, 2023 On 12/29/2022 at 1:17 PM, geeman said: has anyone else used the Amal 80/200 throttle ? if so how do you like it Thanks Geeman I put one on mine when I had the 4T a few years ago. Definitely an improvement (for me). Quote Link to comment Share on other sites More sharing options...
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