Topic: Fuel injection conversion (edit) fixed a few things

[J.Webster Designs]

Look what showed up on my door step today!!!

[Retro Rocket]

Nice....

Mick

[cdoggy81]

Nice!

[Trav-i]

I just thought of something.  Has anyone considered adding a Cycle X charging system.  It seems that their system put out more then stock.  Plus since your going for relialibity and cool, why not add their system to mix.  Just a though on the power problem.

[J.Webster Designs]

I have not decided what I am going to do about the charging system as of yet.

so far I have the throttle bodies which i picked up for $50.00 shipped

and I have an MSD external in-line fuel pump on its way for $95.00 shipped.

next up is the regulator, and Microsquirt EFI controller.


I currently have the throttle bodies apart for re-spacing and moving the throttle linkage to the center. I have already removed the electronically controlled Choke motor, butterfly's, and bearings. I am gonna pick up some JB weld later tonight and finish the removal of the e-choke system. I also need to pick up some 6mm threaded rod and some aluminum spacers.

All in all, I will be right around the cost of a pair of brand new CR carbs and will not have to deal with re-jetting and the down falls of the CR-carbs on the street like over sooting the plugs and running rich at low speeds.

[Retro Rocket]

I just thought of something.  Has anyone considered adding a Cycle X charging system.  It seems that their system put out more then stock.  Plus since your going for relialibity and cool, why not add their system to mix.  Just a though on the power problem.

If you go back through this thread there is a couple of different solutions for this problem, i will be using a modded VFR alternator like the original poster..

Mick

[fastbroshi]

Hey what happened to the orleanscycle website? 

[J.Webster Designs]

so i just tried to put the original carb boots onto the throttle bodies... no luck. I tried freezing the throttle body and boiling the carb boots. It ALMOST wen on... I am going to have to find a different way of making a new carb boot because i just do not like how far the throttle bodies stick out when you make "adapters" to fit them onto the intake ports.

the cleaning and respacing is coming along nicely though!!!

[lordmember1969]

so i just tried to put the original carb boots onto the throttle bodies... no luck. I tried freezing the throttle body and boiling the carb boots. It ALMOST wen on... I am going to have to find a different way of making a new carb boot because i just do not like how far the throttle bodies stick out when you make "adapters" to fit them onto the intake ports.

the cleaning and respaceing is coming along nicely though!!!

Do you need to respace the bodies? I didn't, and they fitted almost perfect. And used the same bodies you do:) God luck

[J.Webster Designs]

I will need to re-space them as they are not correct as they are originally set up. I am also re-configuring the throttle bodies so that the throttle mechanism is in the middle instead of on the end.

[cdoggy81]

If you removed some material from the inside of the original carb boots could they go onto the throttle bodies?

[J.Webster Designs]

I am sure that I could make that work chris... but I don't really want to start tearing up the carb boots that I have just yet as they are expensive to replace from what I  remember.


Anyone have a set of "decent" carb boots laying around that they are willing to let go so I can see if i can make them work for the swap?

[cdoggy81]

crapola... I just let an old one go a few weeks ago when I sold the bike

[J.Webster Designs]

lol. I need to see if i can land some old ones to experiment with before I tear up a good set.

I am wondering if i start removing material if it will sacrifce the integrity of the carb boot. I dont know how prone they would be to cracking or splitting if i reduced the thickness.

[zzpete]

so i just tried to put the original carb boots onto the throttle bodies... no luck. I tried freezing the throttle body and boiling the carb boots. It ALMOST wen on... I am going to have to find a different way of making a new carb boot because i just do not like how far the throttle bodies stick out when you make "adapters" to fit them onto the intake ports.

the cleaning and respacing is coming along nicely though!!!

Did you try soaking them in wintergreen oil and xylene?
http://forums.sohc4.net/index.php?topic=76103.0
If you leave them soaking for a little longer than 24 hours they might soften up enough to get them on there. I threw a set of 1977 cb750K intakes in that were real bad. I couldn't even get the carbs on without doing something drastic. After soaking them for 30 hours the carbs slid on no problem. They even seemed a little loose at first but after a couple of days they were nice and tight. Try soaking what you have before cutting them up!

[750essess]

I didnt renew the domain name on the web site. I run the regulator that came on the cbr tb's. I tried the msd 60fi pump and it didnt like being run laying flat, would loose pressure randomly. The gsxr tb's with the secondary butterfly are a little larger than the ones without I think. I have a set here they measure 44mm. Never got ahold of the older type so dont know the size on them. You could try some 77-78 f intakes they are larger on the carb side IIRC. They is a guy on the msextra forum that has developed a returnless fuel pump controller ad on board. It uses a fuel pressure sensor to control the FP, would make for a no tank modification FI setup and no regulator needed. Here is a link http://www.msextra.com/forums/viewtopic.php?f=91&t=37883&hilit=pwm+fuel+pump
PM him if interested. I drew up a slick fuel pump adapter for the internal pump, looking for someone to make it now. If I can get it made for a resonable price may go this route instead of the atv pump, it would be more compact.

[J.Webster Designs]

zzpete, The carb boots are new so they are soft. I bought then when i freshened up the bike last year.

750essess, the throttle bodies that i have measure out to 48mm OD. I found a guy that is willing to sell me some of his proprietary material that he uses on ultralight aircraft carb boots. I just have to find someone that can mold the boots that I have with a different carb side.

[J.Webster Designs]

I will take some better pictures later tonight and post what they are all about.... but you CAN make them fit into the stock carb boots.

[J.Webster Designs]

Also. I think i am going to start a new build thread for my bike as I am going to be adding quite a few "modern" items in lew of the stock '76 stuff.

[HalfFastMoto]

Nice! Like were this is headed,looking forward to your updated thread - thx

[lordmember1969]

Nice! Like were this is headed,looking forward to your updated thread - thx

+1

[750essess]

zzpete, The carb boots are new so they are soft. I bought then when i freshened up the bike last year.

750essess, the throttle bodies that i have measure out to 48mm OD. I found a guy that is willing to sell me some of his proprietary material that he uses on ultralight aircraft carb boots. I just have to find someone that can mold the boots that I have with a different carb side.

I no longer have access to mold making equipment or I would help u out. Tell me more about the proprietary material, can it withstand 350 deg?

[J.Webster Designs]

can withstand the heat and absolutely no problems with any type of fuels. gas/alcohol, etc...  He can not tell me what his proprietary mixture is of course or he wouldnt have a job.

[23tbucket]

How I installed Suzuki throttle bodies on my SOHC750......Go to #15, #16, #17
http://hondachopper.yuku.com/topic/24588/t/Electronic-Fuel-Injection.html?page=1

[23tbucket]

Here is a short video....'til I ran out of gas!!! I'm just using the auxilary tank right now for tuning. The main tank will flow into the auxillary once done.

But I ran into a BIG problem......Too much boost!! I have a rootes type of positive displacement supercharger on this fuelie (500cc per revolution and running at crankshaft speed). I was in the process of tuning...Just had the cranking, starting and idle real close...was just getting into the off-idle and mid-range when all hell broke loose!! Even at idle it was pushing a lot of air. At 5000 RPM the boost was over 20 psi, and it bent all of my throttle plates. The engine "ran away" on me.....I changed my shorts and went back to the drawing board.
I removed all of the Suzuki throttle plates and shafts. Blocked the shaft openings. All the 4 throttle bodies do now is hold the fuel injectors. I removed the supercharger air filter and built a special plenum out of fiberglass. There is a single throttle body (less the injector) on the intake side of the supercharger now. I am just in the process of retuning the ECM.
http://s258.photobucket.com/albums/hh280/23tbucket_2007/?action=view&current=001-39.mp4