Kdtx240 Posted April 25, 2019 Report Share Posted April 25, 2019 (edited) Hello It's wonderful to join you all I have a tx 240 but the disc valve came loose and jammed, I would say it's a catastrophic engine failure as the flywheel slipped, crank gears slipped, disc valve broke in 2. Flywheel previously welded on and crank taper is in bad shape. Cylinder and piston are fine and bearings all ok Where would I start looking to get a rotax 240 engine to replace my old one or part to fix her. I bought a rotax 122 engine but it would require some fabrication to work- drive sprocket won't fit its too low for the chain. We're worried about the strength of the frame if we start cutting. What alternative engines are there for this job. Preferably 2t but if 4t is easier and fresher and has been done before. It's not for competing just a project but due to the age of her we want to do it right This bike is the same as a swm gori and Armstrong The sprockets are on the right if your sitting on the bike I am open to your ideas and any help would be much appreciated Many thanks Kdtx240 Edited April 25, 2019 by Kdtx240 Quote Link to comment Share on other sites More sharing options...
b40rt Posted April 25, 2019 Report Share Posted April 25, 2019 Bottom end is generally very reliable, Martin at motoswm will be able to supply one I'm sure. Quote Link to comment Share on other sites More sharing options...
petert Posted April 26, 2019 Report Share Posted April 26, 2019 or Richard at Allens Used trials spares Quote Link to comment Share on other sites More sharing options...
teamferret Posted April 26, 2019 Report Share Posted April 26, 2019 i've heard of the climber bottom end being used Quote Link to comment Share on other sites More sharing options...
b40rt Posted April 26, 2019 Report Share Posted April 26, 2019 1 hour ago, teamferret said: i've heard of the climber bottom end being used Easy to do, problem is electronic ignition is now getting old on climbers. Better with a point ignition which can be swapped for a new electronic if required. Quote Link to comment Share on other sites More sharing options...
Kdtx240 Posted April 28, 2019 Author Report Share Posted April 28, 2019 Thank You all for your replies Thankfully the points in ignition system is working The magneto is a bit tired but it still makes power Hopefully should be able to get parts to build her up Will post updates for you all , may be take some pictures so we can all enjoy the upcoming build The tx 240 has been a challenge but a very enjoyable one. 1 Quote Link to comment Share on other sites More sharing options...
Kdtx240 Posted November 21, 2019 Author Report Share Posted November 21, 2019 Hello everyone It has been a while since I posted During this time I have been sourcing a new engine The bike was almost burned in a fire but it escaped untouched and is securely locked away now A tx312 engine has been sourced and will be fitted in due course Will post updates as they happen Thanks all 1 Quote Link to comment Share on other sites More sharing options...
Kdtx240 Posted April 22, 2020 Author Report Share Posted April 22, 2020 Hello all The engine has arrived and is in my possession. Due to the way things are at the moment I can’t get to the frame to get the engine in. However patience will win and I’m not putting my dearest friends at risk over a bike. Allen’s used trials spares got the engine for me for which I am very grateful. Here is the engine I am also building at a 1992 kx125 and a 1990 CR250 Hopefully these photos and the much awaited news of an engine for the tx will lift your spirits in these challenging times. If you would like more information about my bikes please ask Quote Link to comment Share on other sites More sharing options...
Kdtx240 Posted April 25, 2020 Author Report Share Posted April 25, 2020 Just an update on the kx 125 Engine is in Has spark after full rebuild Need a radiator hose so go to parts store on Monday Build the rest of her and try start Kawasaki seems to have aged better than the Honda but the Honda is a simpler machine May try and get the tx 240 frame and keep up the good momentum Quote Link to comment Share on other sites More sharing options...
Kdtx240 Posted April 27, 2020 Author Report Share Posted April 27, 2020 Update on kx 125 Near all built.. have managed to lose the front sprocket getting close to the first start.. I’m a bit nervous because I’ve a lot tied up in this little 125 After the kx is complete it can come off the stand and the tx240 can begin it all began with the tx240 and a can do attitude and asking questions there is a ty80 for sale in my area for 900 is that a good deal? Here are some bonus photos regards kdtx240 Quote Link to comment Share on other sites More sharing options...
Kdtx240 Posted May 1, 2020 Author Report Share Posted May 1, 2020 Update on tx240 frame is home will take a day to remember a bit about the bike.. looks a very simple bike few bits to tidy up 2 quite awkward jobs to do. One drilling out a engine mount bolt on frame. other is wiring frame is in my shed ready for building Quote Link to comment Share on other sites More sharing options...
Kdtx240 Posted May 4, 2020 Author Report Share Posted May 4, 2020 Update on tx240 Engine is in I need to rotate the intake boot to the outside by a bit less than 180 degrees as the motor is actually off a Swm hoping if i loosen the clutch cover it will just move a bit. Front engine mounts may need to be adjusted but it's held by one stud so it's going nowhere New points on the motor and every bearing has been done in the bottom end. This motor also makes a lot of compression. Plan is to get the engine fully mounted by either making new front mount brackets or play around with the ones there Trace the pickup or signal from the points and get spark fire her up Make a chain slider Put chain back on Go test ride Tidy up front forks do seals Tidy up few wee bits Then enjoy the tx240 I may not repaint her only cover bare metal but leave her vintage Tldr : engine in. bit of adjustment needed but very minor work. Party on Quote Link to comment Share on other sites More sharing options...
Kdtx240 Posted May 6, 2020 Author Report Share Posted May 6, 2020 (edited) Good evening all Tonight I spent some mechanic time with my tx I was able to take off the clutch cover and move the intake boot so that the carb would go on. All that holds it on is a hose clamp. One of the dowels is actually a bolt hole too. I got the engine mounted apart from the broken stud. It will need an m6 nut welded on, heated up and slackened that way. It took some prying with a prybar to get it lined up. It was either the heat of the fire or just the Italian way. Here I called on my experience of fitting gearboxes to cars along with my experience of bikes. I think the next step is to get spark and start her up I feel the broken stud can wait to such times suited to delicate work I really do feel we are getting very close to the first start I do notice this is a very large cylinder, I think it's a 311 engine it's definitely the largest displacement bike i own now. If anybody knows what the actual cc is please advise. I can't praise enough how good of a job has been done with the engine i think the crank has even been rebuilt it is basically a brand new engine. Will keep you all informed Regards Kdtx240 Edited May 6, 2020 by Kdtx240 Quote Link to comment Share on other sites More sharing options...
Kdtx240 Posted May 7, 2020 Author Report Share Posted May 7, 2020 Hello again Got the carb on and figured out the wiring. We now have a nice strong spark seems to take very little speed of kick to make a spark. Have hit a problem with the exhaust not fitting.. Shouldn’t be too big of an issue. we’ve got spark, the carb works so we’ve fuel and we’ve compression. will keep you all informed of new work. regards kdtx240 Quote Link to comment Share on other sites More sharing options...
Kdtx240 Posted May 31, 2020 Author Report Share Posted May 31, 2020 Hey everyone so the last 2 Saturdays have been spent on the tx 240 got the exhaust on had to timesert a rung head stud this was not fun at all made a chain slider i need an air filter may fit a k&n to the carb and not need any air box and the decompression valve had to be removed to fit the old tx 240 exhaust to the swm 280 head the bike creates a lot of interest now due to its age and “footery” work regards karl. 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.