Rake Posted March 7, 2019 Report Share Posted March 7, 2019 Hi All, how disappointed is my 9 year old kid. we picked up a TY80 today only to find that the idler gear shaft for the kickstart is snapped and the gear and part of the shaft just fell out. he was in tears and me almost. Now I find that the part is NLA !! Can anyone aassist with any kind of fix possible or is this engine now done for ? Thanks in advance. Rake Quote Link to comment Share on other sites More sharing options...
tony27 Posted March 7, 2019 Report Share Posted March 7, 2019 Looking at Partzilla will give you an idea of what other motors use the same shaft which will help broaden your search results Not really that familiar with what years the TY80 were made but as an example here is the shaft for A & B models & all the other motors that used it. https://www.partzilla.com/product/yamaha/353-15660-01-00?ref=077d15c56588db1d2f2f320eb31147ca11f4a5bc There a couple of brand new shafts using this part number listed on eBay from Canada & the US. They may be the correct part for your bike https://www.ebay.co.uk/itm/Yamaha-Kick-Axle-Assy-Part-353-15660-01-00/153391188038?hash=item23b6d3c846:g:kN4AAOSwdIpcSPqF Quote Link to comment Share on other sites More sharing options...
Rake Posted March 8, 2019 Author Report Share Posted March 8, 2019 Thanks Tony but that isn’t the correct part, the broken shaft is the idler gear shaft and I can’t even find the correct part number as it doesn’t appear on any of the parts lists I have found Quote Link to comment Share on other sites More sharing options...
tony27 Posted March 8, 2019 Report Share Posted March 8, 2019 Ok, from looking at the 75 parts list the shaft you're talking about is 1 of the gearbox shafts, part number 598-17421-00. Fitted to a similar number of bikes https://www.partzilla.com/product/yamaha/598-17421-00-00?ref=e9b9381003ad2d5ac0b735f2a89653adee09ab62 https://www.ebay.co.uk/itm/NOS-YAMAHA-DT80-GT1-GT80-TY80-YZ80-DRIVE-AXLE-PART-598-17421-00-00/263356538646?epid=1923027336andhash=item3d5145df16:g:PsIAAOSwBkRaIV4C 1 Quote Link to comment Share on other sites More sharing options...
Rake Posted March 8, 2019 Author Report Share Posted March 8, 2019 Wow thank you Tony that looks like its the one. I did find a bottom end for sale for £150 that has it fitted already but that is an old one where these are new and not subject to any wear. Time to decide whether or not the new shaft or take the old bottom end. Quote Link to comment Share on other sites More sharing options...
Cheneycol Posted March 12, 2019 Report Share Posted March 12, 2019 I just replaced mine as exactly the same had happened. Ended up getting a NOS part from Germany. Quote Link to comment Share on other sites More sharing options...
Rake Posted March 12, 2019 Author Report Share Posted March 12, 2019 28 minutes ago, Cheneycol said: I just replaced mine as exactly the same had happened. Ended up getting a NOS part from Germany. I found one in the USA and also a used one in the UK. Was it difficult to replace ? I know the crank case needs to be split Quote Link to comment Share on other sites More sharing options...
crashmonkey Posted March 13, 2019 Report Share Posted March 13, 2019 I have done one a while ago, not hard all all, older engine is more simple! Quote Link to comment Share on other sites More sharing options...
Cheneycol Posted March 13, 2019 Report Share Posted March 13, 2019 18 hours ago, Rake said: I found one in the USA and also a used one in the UK. Was it difficult to replace ? I know the crank case needs to be split Straight forward. Careful if you have to hit anything with a mallet. I replaced the main bearings and seals at the same time for piece of mind. Worth checking the kickstart gear for damage and maybe move it round a bit so it engages on different teeth. Quote Link to comment Share on other sites More sharing options...
Rake Posted March 15, 2019 Author Report Share Posted March 15, 2019 Engine now removed - will update with pics once rebuild in progress. Quote Link to comment Share on other sites More sharing options...
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