heronboy Posted September 28, 2015 Report Share Posted September 28, 2015 Hi,I have a 1985 ty250 mono and I am changing the gearbox oil,question is the manual states 10/40,is this the best to use or is light gear oil the way to go?.thanks Link to comment Share on other sites More sharing options...
charlie24 Posted September 28, 2015 Report Share Posted September 28, 2015 Personally I have always used ATF in all my trials bikes. Link to comment Share on other sites More sharing options...
dadof2 Posted September 28, 2015 Report Share Posted September 28, 2015 10W - 40 has a viscosity of about 11 to 15 when hot, ATF at the same temperature only about 5 or 6 so not really what Yamaha intended. Yamalube 10W - 40 or any good quality 10W - 40 semi synthetic is best. 75W light gear oil will lube the gearbox but may not be compatible with the clutch lining material. The EP additives in some gear oils attack the clutch friction material. Link to comment Share on other sites More sharing options...
evoalien Posted September 28, 2015 Report Share Posted September 28, 2015 Make shure it's a 10/40 oil meant for motorcycles, automotive oils have different additives that are not intended for cycle use. May mess with clutch plates Link to comment Share on other sites More sharing options...
ruffmutt Posted September 28, 2015 Report Share Posted September 28, 2015 Do as Yamaha say and all will be well. Link to comment Share on other sites More sharing options...
lineaway Posted September 29, 2015 Report Share Posted September 29, 2015 With my ty`s I always used Bel Ray gear oil. That was long before I started using ATF. No problems. Can`t go wrong with yamalube. Link to comment Share on other sites More sharing options...
heronboy Posted September 29, 2015 Author Report Share Posted September 29, 2015 Thanks guys,will get some oil sorted. Link to comment Share on other sites More sharing options...
gordo Posted July 31, 2017 Report Share Posted July 31, 2017 I realize this is an old post, but I had the same question, and an old post recommended Silkolene Light Gear oil. I tried some and it did not work well with the clutch. The bike shifts well, but the clutch drags, as in pull in the clutch, and the bike continues on a bit. Plus, when cold, you better have it pointed in a safe direction when you put it in gear, as it's going wherever it's pointing. Breaks loose in a few seconds, but a little scary when it happens. 1 Link to comment Share on other sites More sharing options...
hdscarbro Posted August 4, 2017 Report Share Posted August 4, 2017 I've been using Spectro Clutch Saver in my two ty175's. There's a moderate amount of drag when the engine is cold in one of them. Hardly any drag with the other one. I think that I used a surface plate and sand paper to dress the plates in the better behaving at some point in the past to insure they were flat. Yamaha Enduros from the same era as the ty175 had special rubber bands to keep the plates from sticking together. Link to comment Share on other sites More sharing options...
guy53 Posted August 4, 2017 Report Share Posted August 4, 2017 Read the Beta clutch fix by dan William ( in the Beta section ) it does apply and it's worth the effort. Guy 2 Link to comment Share on other sites More sharing options...
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