Mikuni BDST32

[Paul in NZ]

HELP - Does anyone have an exploded diagram, parts diagram, anything on the Mikuni BDST downdraught CV flatside carb???

Cheers

[riffer]

My RF has BDST36's.

I wonder how different they are? I can send you exploded diagrams but I reckon they may be different.

Is it for the FZR?

I'm pretty sure you can find online fiche for these suckers.

[Paul in NZ]

My RF has BDST36's.

I wonder how different they are? I can send you exploded diagrams but I reckon they may be different.

Is it for the FZR?

I'm pretty sure you can find online fiche for these suckers.

Probably the same Simon but smaller - most online fiches are for the non exup earlier model - if you can scan or photo copy I'd be grateful

[riffer]

No worries mate. Here's a PDF with the complete exploded diagrams of the BDST36 carbies.

Part numbers are all Suzuki but I guess you aren't too worried...

[Paul in NZ]

Thats the bugger!

[riffer]

Farkin' Excellent!

Glad I could help.

[Kickaha]

You could also have a look here
http://www.yamaha-motor.com/sport/parts/home.aspx
there is a 1988 FZR400U in there

It's an American site so the models aren't always what we got here but it's been very useful when I've looked stuff up

[Paul in NZ]

Thanks - there are a lot of similar sites for the US ones - mines more like the SUC in that it has the EXUP...

Simon - can the plastic slide guide be removed to get access to the needle jet or does it attach from below somehow? I don't want to force things...

[riffer]

Hey Paul.

Yes, it comes out pretty easily actually. Here's what I did. It may be the right technique - it may not. It worked for me though.

What you will find is that the fine dust that the filter doesn't stop tends to accumulate in the carb and this sticks it a bit.

Take off the diaphragm cover and spring first. I found that with some really gentle pressure (and a bit of WD-40) and easing with your fingers you can get the rubber edges of the diaphragms to pop out of their recesses in the carb bodies. They form kind of like an o-ring seal at the top of the carb. Watch out though - I bet they would rip quite easily.

Then push the diaphragm and slide out from the bottom carefully - if you just hold the carb upside down everything falls out and there's a few tricky spacers and stuff you can easily lose. Don't push too hard on the needle - you don't want to bend it.

Then its just a bit of pushing and the throttle slide will come out. I used some WD-40 spray to lubricate its passage.

Like nearly everything on a bike I reckon its a case of if you have to push too hard you're probably not doing it right.

Have fun.

[Paul in NZ]

Sorry - I was not sufficiently clear... I was refering to the plastic guide that the odd shaped slide runs up and down in.

The slides are out - no problems... I want to remove a needle jet to check for oval (and curiosity) but can't see how to get easily at them. Normal Mikunis = no problem but these are odd. Does the RF manual have a dismantle the carbs section?

Cheers

[riffer]

Paul - I have PMed you F5 Dave's cellphone number.

Give him a call - he has dismantled and rebuilt the emulsion tubes on BDST carbies and he will know a much better way of getting the tube out than I will.

Simon