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Carb instalation prob.

  • Thread starter Thread starter craywm
  • Start date Start date
C

craywm

Guest
Hey guys,

Just rebuilt my carbs! Way to go me!:clap: While i was trying to put them onto the bike, i was having a lot of trouble. they are vm carbs off a 1979 GS750L and all the intake boots are lining up with carbs. I pushed as hard as i could and they wouldnt go into the boots! so i pulled out the mallet (rubber of course) and slammed carbs 1 and 4 alot. After it was all said and done, they fell off. For some reason i cannot get the carbs to go over the lip on the inside of the boots. I have never done this before and i wanted to make sure i wasnt doing anything wrong. Also is there a good way of doing this? or will i just have to keep hitting them with the malet? Thanks all!

Cray
 
Smear a liitle bit of silicone spray on the boots and if they haven't gone rock hard they'll slip in nicely. If the rubbers have gone hard warm them with a heat gun or hairdrier until they are pliable.
 
Should i use greese or spray? Like wd40 or a greese? And it is very very cold outside
 
If your boots are hard, it's best to replace them. Yeah, it's expensive, but you'll be amazed how easy the carbs go in

Don't hit anything with a hammer. Carbs should just slip in

Here's what I do

Be on the right side of the bike. Attach throttle cables to carbs and turn throttle to confirm you did it correctly

Insert Carb rack across the back of the motor, leading with #1. Have the fronts tipped slightly down.

Push the fronts down and back and get them into the intake boots with the tops of the carb spigots into the boots

Using a screwdriver, pry the air box boots over the bottom lips of the carbs and about 1/2 way up the carb mouth

Confirm that the carbs are going into the intake boots

Push down and forward to get carbs into intake boots

Finish prying the air box boots up over the carb mouths, wiggle the carb rack around and everything should be ready to tighten up all the clamps
 
Silcone grease is Ok but not automotive type grease that will eat up the boots. I sit on the bike and think its an easier way to get them on. Put the cables on first before putting the carbs in the boot as was mentioned.
 
They can be a real bugger when its cold out. Even new boots get hard real fast in cold weather. I would use a heat gun or hair dryer on them, lube the end of the boots with a little motor oil.
I tend to work mine on from one side to the other. I also wedge a 2x4 in front of the front tire so the bike doesnt come off the centerstand while pushing the carbs on.
 
As the others mention, heat and lube are the key. The boots are hard and brittle when cold so apply a heat source ( I like the electric paint stripper guns) and a shot of WD 40.

Once the cables are attached, line up the carbs to the boot. Use a long handled screw driver or length of broom handle or something similar as a lever. With the tip of the lever resting against the bottom cross frame motormount at the back of the engine push forward against the carb "gang" rail. The carbs will pop in.

An alternative is to use a length of wood as wide as the carbs and a ratchetting strap. With the carbs in position ( use heat and lube on the boots don't forget) and the wood against the filter side of the carbs wrap the strap around the carbs and the engine. If positioned correctly ratchetting in the strap will pop them in.

Do it once or twice and you'll never have a problem again.

Good luck with it.

cheers,
Spyug
 
Hey guys thanks for all the help. I got the carbs on using head and lube. started to turn her over and had fuel going in through a makeshift resevoir.
Not really sure what happened but it blew up. the bike is toast now. im super upset. i was really looking foward to riding it.
 
something lit on fire. blew up the bike. im sure the engine and gars are still fine.. but all the wiring and the displace and the tires and hydraulucs resevois are totally gone. they melted. my brother sprayed the fire extringguisher last weekend for nfun and i didnt have anything to put it out with.. thats the death of my gs750. so freaking upset. and ****ed at myself
 
Found a 78 gs750. Thinking of buying it to ease the pain. Its a project bike. Not sure yet though. I feel like i just lost my genitals.. this sux.
 
$hit that sucks man... At least youll have lots of spare parts if you get another 750...
 
erything is fed... the display blew out and all the wires are toast.. the only good thing is the engine.. what should i do? trash it..
 
Wow, what a nightmare! Hopefully you'll be able to salvage something.
Still can't believe that.
 
nope barn/workshop is fine. Heres some pics of the carnage. in this first one you can see where it lit on fine and how i had to drag it out into the snow to save the barn.. lack of an extinguisher.. if i had one, could have saved almost all of it.
 
heres where it stands. for the first time. battery blown out. display blown out. headlight blown out. tubes melted. handles melted. she almost looks dead
 
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