75 GL1000 Intake Manifold Conversion..

[2speed]

Hello, Fello Gear Heads...
After Searching and reading about the 4 into 1 Conversion Intake Manifold on a 75 GL1000, I Decided to build one my self...
So, I searched around in my Shop and came up with this...Kinda Slick!!
10" Piece of 2" Square Tube...Drilled 4, 1"-3/4 Holes in it...Capped the ends... Cut 4 Pieces of 1"- 5/8 Pipe with an Angle at one end faceing the Center!
Loosely mount them on the Engine....And Tack them in place...
Then remove it and Finish welding them in....I then Drilled a 1"-5/8 hole in the Center, then drilled 2, 5/16" holes to mount a 1966 VW Solex Pict-1 Carb.
Then I Primed and Painted it!! ...WHAM!! This Project Took about 3 Hours to build and didn't Cost me a Dime...Other then the Paint, welding rods, Elec-Bill.. I also Fab a Throttle Cable Mount at the Bottom..
Installed the Manifold, then the Carb....Then Crossed my Fingers!!! I WAS SHOCKED!!... It Performs...Perfect!! Idles..Smooth!!...No-Issues!!
Road Test...Passed! Has Decent Power at Take Off! ....Endless Top End Speed!!...
I'm 60 years young...I think is Fast enough...
Here's a Few Pic's....( ENJOY! )....
2-Speed

[HawkeyeGL1200]

Good job with the conversion... I've seen a few examples of the single carb mods, and yours looks better than most I've seen. I'd like to hear back from you in a few months to hear if you're still happy with it... also: What kind of fuel mileage can you get out of that rig?

[2speed]

Good job with the conversion... I've seen a few examples of the single carb mods, and yours looks better than most I've seen. I'd like to hear back from you in a few months to hear if you're still happy with it... also: What kind of fuel mileage can you get out of that rig?

Thanks for the Comment...Hawkeye!
The bike was a Barn Find...been sitting for over 24 years....I've been rebuilding it, into something Wild & Crazy! Lol
The Carbs were Seized Badly, Would cost a Bundle to rebuild them.
So that is why I built the Manifold.
Will, stay in touch.

[seadragon22]

Nicely done, 2 speed. I am looking to do something similar with my '77. Did you use a buzzbox or MIG? Whose?

[HawkeyeGL1200]

3rd picture down (I think) shows an electrode holder with a welding rod in it. Looks like he stick welded it.

Nicely done, 2 speed. I am looking to do something similar with my '77. Did you use a buzzbox or MIG? Whose?

[seadragon22]

Yes. It does. What flavor rod do you suppose he used? 6000 series or 7000?

[HawkeyeGL1200]

Probably 6010 looking at that red welding rod LOL... just a guess.

Yes. It does. What flavor rod do you suppose he used? 6000 series or 7000?

[seadragon22]

Good analysis Hawkeye. It's been awhile for me but you are correct. I am sure that is 6010 in the stinger.

[HawkeyeGL1200]

It's just a guess. I recon it could be most anything. I guess you really don't need structural strength to make a manifold. It does need to be air-tight and 6010 would probably be what I'd use because it runs okay no matter what kind of machine you weld with if the amperage is right. It's what I have most of on hand. I'm rusty as an old horseshoe at welding. Kind of like playing pool... I still THINK I can do it, but when the time comes, there's plenty of technique I've forgotten over the years. I can get two pieces of metal to stick together

Good analysis Hawkeye. It's been awhile for me but you are correct. I am sure that is 6010 in the stinger.

[cuyler2]

hello there 2speed ,do you belong to the ngw forum? we've been building these for a while and might need some encouragement shared with us on your exploits.check out the "single carb conversion" on the site. there is also a silly guy with a 4-barrel on one(guess who that is!)

[2speed]

To all the GearHeads out there Reading and checking out my Project....I used my Ole Trusty ( Lincoln Duce & Quarter AC/DC Welder ) @ 120 amps...Melted & Burned all parts together with 6013 1/8 Rod.
Plugged all ends, and Pressure tested @ 100 PSI under 12 inchs of H2O... ( WATER ) ...No Leaks!! .." OF COURSE " LOL
Then Vacuum Tested it for, over an Hour, Stayed @ ZERO!!....Passed!!... " OF COURSE! "

Then...Primed & Painted it. JOB WELL DONE!!
Installed, Runs Like a Raped Ape! Idles...SMOOTH!!!

[what huh]

cant wait to do this on my 76.... nice to ride her again

[seadragon22]

OUTSTANDING!!! Thanks for the update.
I've got the old Cycle Innovations Single Carb Holly and manifold but I am in the process of rebuilding it as we speak.
When I orignally put it on, it ran superbly and there were no "ticky tack" issues as I had been warned by every fool and his brother.
Performance was excellent and mileage was also great!
An unfortunate divorce caused me to put the scoot away from the ex and her wretched, man hating lawyer, but I am bringing it out of retirement!! LOL!
I love the smell of gasoline in the morning. It's the smell of VICTORY!!

[cuyler2]

did you buy the manifold and carb new and/or with instructions. the reason i ask is that some of those kits came with directions as per altering the plug gap. or do you remember this about the plug gap?

[Mudge]

Hi nice job, i bought a kit from one of your fellow american cousens but unfortunately my baby has never run right since the motorbike workshop mechanic fitted it!, the manifold is good no leaks anywhere but the carb is wrong somewhere, its as rough as a box of nails on tick over and no amount of adjustment will sort it out.
After taking my gl1000 to a VW specialist restorer here in portsmouth u.k. he checked everything out and yold me its not mybike per say but it is the carb, aparently irs a cheap chinese copy, the mechanic at the vw restorer went through my bike with a fine tooth combe, and found the compression was very good on all four cylinders and the timing was spot on but something was not righg with the csrb but as soon as he put a genuine vw carb on the manifold xhe was as smooth as a babys bum on tick over and she pulled away like a rocket without even a little cough....Mmm very nice.
So if anyone over there can help me out by findinv me one of the carb thats been usdd i would be very gragrateful as its not easy finding the right carb over here thats not been butchered or totally messed up by domeone who has no idea what they are doing or they try to flog off more chinese rubbish.
So im almost on my knees begging for help.
Vic

[cuyler2]

I buy mine from National carburetors in the U.S. but they have distributors worldwide. I always buy the pict34-3 at $116 and just bolt them on an fire 'em up. One day I put the same one from my 80 GW on to a 1200 and a 1500 to demonstrate what it would do!

[seadragon22]

This is terrific information! I thank you for it. Honda has been hiding under their corporate desk for many years on these issues and this is a superb opportunity to resolve them. I will be putting one of these on this summer and will test and advise. Once again, many thanks.