Those of you with bigger carbs.

[Budget_Blaster]

Ill be putting on a TM34 mikuni carb (THANKS TO SICIVICDUDE I:I ) and would like as many and as detailed pics as you guys can get of the install of a bigger carb.

I plan to use the stock air box at this time and did a search and found some good info but id like more detailed info like a parts list and a step by step if possible.Preferably using parts i can get at the local ace hardware since thats what we have there in town.


Im actually shocked theres not one on here yet with all the info thats already here. I did however get a lot of good info so far from "BRAAAPTOR" guy seems to know these carbs very well again thanks bro!

So to those of you who have installed these bigger carbs can you maybe make a sticky worthy write for those of us who havent?

Also while on the subject what are your predictions for how my 240BBK will wake up to the addition of this part and my current mods?I like my FMF SST2 header and plan to keep it but will it be hindering power enough to make an exhaust swap worth the money?I do eventually plan to swap it out for a dynoport setup but its not high on my priority list until i finish my kdx.

What do you guys think???

 

[N8tsNastyBlasty]

i did a diy on the intake boot mod, and for the airbox i used a rubber pipe couplerto the carb a piece of 2inch? pvc pipe that i stuffed in to the airbox boot after cutting off 3-5 inches off of it and clamped it all together w hose clamps. works great!!! i also use modded stock thumb throttles. it will help alot on ur overall performance. me and my bro have a few vm 34's we plan on putting to use somewhere.let me know what jetting u end up with.

 

[Budget_Blaster]

How did you mod the boot?Was it the stock bootAny pics?

 

[blasterdemon7]

This is a little different because I added my own filter but I hope this helps. You will be doing close to the same thing. You will have to cut your stock airfilter boot back some and run the PVC pipe inside of it. Use a hose clamp to tighten it down.

 

[YZ Otis]

Here's some pics of the old basic hardware store approach explained above. Ain't pretty, but it's cheap and it works. There's a lot of variations you can search up.

 

[Paulie B]

Here's some pics of the old basic hardware store approach explained above. Ain't pretty, but it's cheap and it works. There's a lot of variations you can search up.

That's the way I would have done it...

 

[blasterdemon7]

Thanks Otis. That just what I was talking about but I didn't have the pics. That's the way I did mine first then decided to try a full custom setup but ended up finding a good deal on a CFM box.

 

[Braaaptor]

Glad I can help 'ya out!

Otis has it explained best for how to mod the stock intake. I didn't mod mine this way since I was already running a CFM airbox, but modding the stocker is fine for the moment. Not to mention cheaper!

You can also mod your stock intake boot for the 34mm carb to fit, but I'd rather just go out and buy a new 34mm intake boot and have it done right the first time. It's up to you. I don't like the idea of a possible air leak when modifying an intake boot. That said, lots of people have just enlarged their stockers with no problem....

You'll need a reed spacer to get the 34mm TM carb to clear your clutch arm. The thinner the spacer, the better.

Your existing TORS eliminator throttle cable will work fine with the new 34mm TM carburetor.

I'd start with a 320 main jet and a 35 pilot and see how the engine likes it. Do some plug chops and tune from there. See what needle is already in the carburetor. I run a 5FP17 needle in my TM carb, and though it is a bit rich for my ported-stock-jug engine, I bet your BBK will like it. Try one and see.

Your engine will really wake up once that bigger carb is installed and tuned properly. I would strongly recommend getting a Dynoport or CPI big-bore pipe when the funds allow, because a bigger carb is only part of the performance picture. A larger carb + the proper pipe will really make a BBK Blaster engine rip. That FMF pipe you have now will work, but it won't let that big-bore engine run at its best. FMF pipes seem to do best on nearly-stock engines, or when racing short tracks (where you need lots of low-end and mid-range power.) My .02

 

[Budget_Blaster]

AWESOME!!!!

Those are the ideas i had but needed to see them done.And i knew someone had did it and id seen the pics but it was a long time ago and i wasnt too clear on the mods hell yea though guy thanks!

 

[N8tsNastyBlasty]

to open the stock intake boot i use hot as f*ck tap water and soak the boot till its soft then stuff the carb in and let it cool. works great and is free!!! after doing this the carb will fit in and out of the boot easier but its so tight at first that u almost need a lil lube ,lol i did a diy thread called big carb in a lil boot or something

 

[Budget_Blaster]

to open the stock intake boot i use hot as f**ck tap water and soak the boot till its soft then stuff the carb in and let it cool. works great and is free!!! after doing this the carb will fit in and out of the boot easier but its so tight at first that u almost need a lil lube ,lol i did a diy thread called big carb in a lil boot or something

i dont know why but i cant find your diy got a link id like to read that info.

so in theory can i boil the boot to make it more pliable?did you ever have any issues after doing this?

 

[super noober]

Here's some pics of the old basic hardware store approach explained above. Ain't pretty, but it's cheap and it works. There's a lot of variations you can search up.

very nice otis, have another green box lol I:I

 

[Benol_banshee]

thanks super noober that actually helps me out to because i just orderd a 33mm carb.

 

[Budget_Blaster]

Anyone got a link to the DIY on modding the stock boot its the only missing link for me.

 

[EvilElvis]

Anyone got a link to the DIY on modding the stock boot its the only missing link for me.

I used a 30 grit sanding disc...coned it up and started grinding away.....end result pj34mm on a stock intake boot I:I

 

[Budget_Blaster]

I used a 30 grit sanding disc...coned it up and started grinding away.....end result pj34mm on a stock intake boot I:I

Hows that working out for you after grinding it out?How thin did it leave the boot?Any rips or anything like that to cause leaks?How long has it been running sucessfully like this?

I really like the idea of boiling the boot and stretching it over the carb but im kinda worried about ripping the boot.

After seeing your method im starting to really consider it.That looks like it came that way.

 

[Budget_Blaster]

Also will modding the stock boot hinder performance?

 

[EvilElvis]

there plenty of meat left and its a tight fit still ....but work just fine also I forgot to mention I wrapped the disc around a jack handle to get most of it then coned the disc for the rest

 

[EvilElvis]

Also will modding the stock boot hinder performance?

not at all just make sure you go all the way throught the boot

 

[EvilElvis]

what I didnt try and makes sense is to freeze the boot at first to remove the most material