New owner

[daley1471]

Just got 2001 DT125R anyone tell me what’s best 2 stroke oil and how long b4 I get service thanks ![alt

[HOTSHOT III]

@daley1471 This stuff is ace, I ran it in my 1998 with no issues. Conforms to the Japanese industry standard for racing two-stroke oil, injector or premix (keep the oil pump) and exactly the same colour as Motorex Cross Power 2T which costs around 3 times as much:

https://www.ebay.co.uk/itm/290755921657?_skw=exol+optima+2t&epid=662909457&itmmeta=01K3KZWN7X8TD3CT7J8TBWWTQM&hash=item43b26746f9:g:Rq8AAOSwNJNmTfy6&itmprp=enc%3AAQAKAAAA8FkggFvd1GGDu0w3yXCmi1eNjL639xZVAqN3GclCxJmhzHehkechOcOu6rKbPf6X3dTEaSCllMI0FK66SVRoBi1YvRcZX%2Bae7kD%2BtGSe1upOU3uTySQplz%2FYz4xCi%2F66aN0TkIWPsOJmsPcDLUFo04Plnudr35mJxW6VDHG%2FZ3XI941jXeZ0v0uWesuVeVy2o%2FFVrIteHaIem0OqtoLl7hWwWvFfmEmgmnxUnaukWFcdZmCc3gwCD6DdI3iuXCkV7b2mc3MNC0YLn%2F8BVAk%2BRNVOhVWQGhq%2FEg1cHyYucM%2FTfJ0Qr81OWy6x3rX7lMwOHw%3D%3D|tkp%3ABFBMjtTy_5xm

You can save even more by getting a few mates together and chipping in for the 20L:

https://www.ebay.co.uk/itm/196815078744?_skw=exol+optima+2t&epid=662909457&itmmeta=01K3KZWN7XMEWDW0HTKNRTT4FB&hash=item2dd317c558:g:JCUAAOSwJUdnNzDA&itmprp=enc%3AAQAKAAAA8FkggFvd1GGDu0w3yXCmi1d5yFGR2t%2FVv642o7SZ%2By8tY8EX3mx0sT4B2NFP7NyXC1bOCaKJA3mDNs30MBBKxR6qDwyLCnLzA9CaZlsdRS9PelaNJuhVxlMpTNpRXYhg2TpeKMDUsTmdFXhFTDaLBZmzY5ejZL%2FcNwak1LazWORcorR1RMxom%2FVZaX3F9F%2B99VGjshlYStdYGxG9C9jbGED8yUQiIH1W1sB4BqeUx0A0CThyXPUxSt%2BLJm%2BpXfFVE%2FxtLsju1TgbvbKm0%2FV3tgvI5DjdBr0I3sPElNqlZrYghx%2BsU5rLe%2F4E8I2S21Ih6w%3D%3D|tkp%3ABFBMjtTy_5xm

Get a Haynes manual and read up on doing an oil pump bleed, and think about a clear oil line kit from Yambits for peace of mind.

Servicing intervals kind of depends how and where you ride but I'd start with a few air filter elements from Yambits (as good as genuine but half the price, if you get a few you can wash and re-oil them in rotation) and a cable oiler for £4.99, and order a gearbox oil drain bolt and some copper washers from Fowlers (£2 genuine). These are designed to stretch and break if overtightened, a PITA as you have to get the clutch cover off and wind out the broken part but better than needing new crankcases. Everyone overtightens these so it's one of those things worth buying genuine. Tightening torque is 15Nm so get a 1/4" drive torque wrench from a cycle shop (under £20 as so much stuff on MTBs has torque values now) and this will be good for most of the bolts around the bike like fork/axle clamps etc.

Look around for a good deal on a box of BR9ES spark plugs, and fit an NGK LB05EMH plug cap (the type moulded into one piece of rubber).

Have a really good look at the chain and sprockets and use quality replacements if in any doubt.

Get a grease gun for the rear suspension linkage bushes and there are posts on here showing you how to fit them to later bikes' swingarms/relay arms where Yamaha deleted them.

Get 5 litres of Gunk/Jizer to wash the bike, and 5 litres of WD40 with the free spray bottle from a motor factors; after washing throw old towels over the wheels to protect the tyres/brakes/spoke nipples and just WD40 the whole bike, specially around the engine/carb/shock/wiring. This protects it and makes it easier to wash next time, as well as preventing common DTR problems like seized carb mixture screws etc.

A MX bike stand (the type where you wheel the bike over it and press a pedal to raise it) makes everything a lot easier, specially chain maintenence and oil level checking.

Hope all the above doesn't put you off but a lot of bike shops these days aren't really up to speed with 90s two strokes so it can be of great value and very rewarding to get into doing all this stuff yourself.

[Calum]

Hello,

What's the mileage on your machine? Depending on how many miles it's done will influence what type of servicing is required. Have you got any history for the bike, do you know what's been done on it in the past?

@HOTSHOT-III has already given you a wealth of information to get started with, typically these machines are very reliable and dependable, but I always err on the side of caution, if it can be done, then I like to do it.