Carburetor help
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Hello! I have a 1988 Yamaha dt 125r, I've had problems with it but nothing major.
One of the problems is with the carburetor: the needle is missing two washers, one under the clip and one over the clip. As they don't sell those washers individually I decided that I'd make my own washers. The only problem is that I don't know that size they're supposed to be, so if anyone has a 1988 Yamaha dt125r or even a Tzr125 (they had the same carb I think) I would appreciate the sizes of those washers, especially the thickness.
Thanks! -
Hi @kristóf,
Mmm, problem indeed. This is worsened by the fact that this carb was only fitted to your year of DT. I don't know what the LC's ran and later models used a 28mm flat slide.
I can't imagine the thickness needs to be spot on, should match what other carbs use for thickness, possibly 0.1mm I'd have thought. See what others recommend though as I've just pulled that figure out of thin air and don't have my verniers handy.
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Do you think the washers are compatible with the later models? I've looked at photos, they seem to be identical. Even if they aren't, It would be at least a great starting point to know the later model sizes.
@Kristóf I'd be tempted to have a look on eBay etc for someone selling plastic washers of the correct inner/outer diameter. Either that or a hobby shop as these kinds of things are used a lot on radio-controlled models to make small adjustments. For example on a 1/10th scale RC car, placing a 2mm washer behind the rear wishbones is the equivalent of shortening the wheelbase 20mm in real life. For a fraction of the cost of one of those needle sets you could get a huge selection of different thicknesses and just see which ones fit the best. I'm not too familiar with the VM26SS carb but on the later flatslide carbs the plastic washers just keep the needle/circlip in place between the actual slide and the part the cable attaches to allowing a small amount of free movement, I'd just pick the washer thickness that does this best.
If you become (or already are) really good at jetting this could also open up other possibilities such as using one thick washer and one thin one and swapping them to move the needle the equivalent of half a clip position and that kind of thing. Maybe beasure the distance between needle clip positions and base your selection on that when ordering?
