Mikuni BS34 Carburetor - Stripdown /Cleanup /Rebuild - Part 1

[@qivarebil2149]

You might want to pop out the needle jet as well. They are tapped out - after removing the main jet and the washer, by slightly knocking at the main jet end, and the jet can be pulled out through the throttle valve bore. It needs to be done, to ensure the small holes on the side of the jets are completely open and clean. I use a hard plastic rod as a drift to knock them loose. If You can find new cheap ones, just replace them, as the seats tend to wear in an oval pattern - causing the air/fuel ratio to be too rich, at all throttle positions. Thanks for sharing this, and good luck on the rebuild! 🤩👍

[@qivarebil2149]

Just be sure the jets are oriented the correct way around, when reassembling them. There's a tab at the bottom end which fits into a key opening on the jet.

[@TheAmateurBikeBuilder]

Cheers, appreciate that, i think some are missing, but will recheck next episode, tried tapping the tube but all seized have soaked them and hopefully will come out next time , first time for me on Mikuni complete stripdown so lots to learn , Thanks

[@TheAmateurBikeBuilder]

Cheers

[@bandittunes96]

Great episodes, really enjoy watching, keep up the great work 👍

[@brianmccall8538]

Emulsion tubes to remove, the main jet screws into them. 4 washers and 4 rubber o rings to remove, these will be stuck in the mixture Screw tubes, the ones you took out with the springs on. 4 rubber plugs to remove right beside where the main jets where, that gives access to the pilot jets for removal.

[@TheAmateurBikeBuilder]

Thanks Brian, appreciate you comment, hopefully they will come out in the next episode as couldn't knock them out,, will look for the other parts as i think there are parts missing, they are in a state, Thanks again

[@cu5143]

Hi bike builder! Great vid ! have a bs34 on my z1 , and wondered if all 3 J’s have the same carbs ?

[@TheAmateurBikeBuilder]

As far as i am aware yes they do

[@johnpaulirwin4211]

You have forgotten your primary jet and main jet wear The needle slides up and down plus there’s two Spring 2 little ballbearings for your chalk that still left in the cabinet as you will lose them in your ultrasonic cleaner

[@TheAmateurBikeBuilder]

Thanks John, appreciate your comment, a few of the original jets are missing but will be in the kit when i rebuild them, as for the small ball bearing nothing came out and they were not in the cleaner when i cleaned it out, i have seen them on the fiche picture but not in the carbs

[@geoffreynewton1299]

How's the old varadero getting on do you still have it?

[@TheAmateurBikeBuilder]

Yes, still have it, not touched a bike in 4 months as not been well, so it is in a bit of a state

[@matiasdogui]

hola, estoy buiscando un kit para los 4 bsd34 de mi yamaha, con diafragma. tienen venta de repuestos??

[@TheAmateurBikeBuilder]

Try www.nrp-carbs.co.uk/

[@marklast2900]

Hi what about the pilot jet

[@TheAmateurBikeBuilder]

Cheers Mark, as i discovered and said in another comment, there are parts missing, but i have the rebuild kits so will be there on re-assembly

[@marklast2900]

@@TheAmateurBikeBuilder hi amb when u resemble say how many turns out you go on the pilot air screw setting also can you show how you check the float bowl height please

[@TheAmateurBikeBuilder]

@@marklast2900 will do , Thanks

[@mikeymike3240]

What about the Kawasaki gt550 1991

[@TheAmateurBikeBuilder]

Thanks Mikey, i tried to find as many fitments as i could and so put there are probably more and yes they were on GT550 as well, cheers

[@qivarebil2149]

I think the GT550 had TK carbs through 1987, then Keihins from then, and on.

[@TheAmateurBikeBuilder]

@@qivarebil2149 handy to know