VM28 Jets

[jgr72]

My bike is 3BN, if it will make any difference... I will have to take another look of the carb
Last time I took some measurements: engine side diameter is 35mm, air filter diameter is 43mm and its abt 84mm long, but didn't look the exact model

Isn't jet numbers all the same? It's a hundredth of 1mm? But the carb body effect that, there have to be different jetting, even the size is the same... for example 28mm.

By the way, isn't 3DB an DT125LC'88 model? And 3BN an DT125R'88?

[Calum]

@jgr72 Jet Numbers are not the same.

I haven't any experience with the 26mm round slide carbs, but you would do well to grab the later Mikuni Flat slide carb.

[Darty]

@jgr72 said in VM28 Jets:

By the way, isn't 3DB an DT125LC'88 model? And 3BN an DT125R'88?

Nope.

3BN and 3DD are frame numbers for 1988' DTR's

3DB1 is also a model code for 88' DTR.

[jgr72]

This site says its an LC model:

https://www.motorcyclespareparts.eu/yamaha-parts/yamaha-model-prefix-motorcycles-1970-1994.aspx

try to fin 3DB and it says: "DT125LC'88"

Anyway that site doesn't say 3BN to be an R model... confusing...

[Darty]

@jgr72 https://www.fowlersparts.co.uk/browser/manufacturer/yamaha/bike/dt125r/year/1988/model/dt125r-3db1-1988-999-a

The Haynes Manual will tell you more about the production runs.

[jgr72]

Okey So my bike seems to be an early '88 !?

[jgr72]

Where to find mikuni identification? I tried to look both sides but didn't see nothing...

[jgr72]

Today I took the airbox out, and blowed dirt away, I also changed main jet to 200, and that feels much better than 250. I also measured the carb size, and it is 28mm:

I couldn't find any information about the carb size or model, it has some Yamaha stamps but nothing else...

[declan]

@jgr72 sorry to hijack the thread but does anyone know if those late year round slides are a direct fit to the 1990

[jgr72]

Measure both ends and length... This VM28 is 35 at the engine side, and 43mm at the air filter side and total length is abt 84mm.