DT125R FORUM

A crack in the airbox won't manifest itself as an 'air leak' as it's before the carb. Obviously you are bypassing the air filter and that's not ideal, but the engine will behave normally as you're not running the engine lean since air will still rush over the carb and pick up fuel. You can run without the airbox just fine. But yeah, sourcing a new carb boot would be ideal 3MB-14453-00 That's the part number Or fit a later dtx/re one and bung the YEIS or source the YEIS. 3RM-14453-00

@Rat80y The drain bolt stretching is a common thing on the DTR, IMO it's a design feature as if you overtighten it it usually snaps. Whilst being a right PITA to get the clutch cover off and wind out the broken part, it does mean the thread in the crankcase is saved (new crankcases = much more difficult/expensive than taking off an engine cover) so I hope you've ordered genuine from Fowlers (get a load of copper washers as well for future gearbox oil changes). Tightening torque is 15Nm so it's also well worth getting yourself a 1/4" drive torque wrench like this one: https://planetx.co.uk/products/jobsworth-pro-torque-wrench-set-1 There is some truth in both your AI source and what your friend said. In the days of the 12bhp learner restriction, DTRs with the powervalve pinned shut would struggle to rev beyond 6k rpm but properly set up/derestricted/full power it should rev to around 10k.