88 Dtr air joint help
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Hello! I just bought an 88' Dt 125r and it's been having a couple of problems, one of them is a horrible air leak, tried figuring it out and realized that my air joint (between carb and airbox) has a crack and it's from a Tzr which is shorter than the original 3BN one, does anyone know where it would be possible to get a 3BN one? It can be used or aftermarket but I need a reasonable price.
Thanks! -
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 -
In that case what could cause the air leak? Also the part number for the 88 isn't the 3mb one as there is a joint made specifically for that year: 3BN-14453-00 and the difference is that it's longer than the other ones so right now it's also hard to fit the carb properly
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Yes, the air leak will definitely not be helped by not plugging up the oil inlet on the manfild, albeit a tiny leak.
Yes the '88 DTR ran the TMS26 carb not the TM28 carb found on all other years.
That said, I am not aware of any other changes. So finding a suitable inlet manifold (probably can still be had new) and the airboot shouldn't be hard. But finding a genuine Mikuni 28mm is trickier.
A split in the carb boot is not ideal, but it won't be the source of your problem. I'd just smear some silicone onto it and allow that to harden.
Crank seals are common causes for air leaks, as well as the gasket on the inlet manifolds (once you sort the oil connector out).
Spray some WD40 around the general vicinity and if the revs drop back to normal then you've found your culprit .
