Weighing Fueling Options

Andrew11
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Re: Weighing Fueling Options

Post by Andrew11 »

Wondering if you are getting any further with this. Any progress on having throttle bodies cnc machined?

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Syscrush
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Re: Weighing Fueling Options

Post by Syscrush »

Like a lot of people, covid put almost my whole life on hold. The focus has been on managing 2 young kids with sporadic school/daycare and 2 parents trying to work from home. The time I had planned to use for scanning & modelling custom TBs gets used up with work and kids, and the money I planned to spend was impacted by multiple leaves from work, and shifting priorities.

I'm really eager to do this, it's at the top of my list of priorities once things get back closer to normal again.
Phil in Toronto
A cool guy deserves a cool bike, a dork needs a cool bike...
Pics of Perry, my '79.

Andrew11
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Re: Weighing Fueling Options

Post by Andrew11 »

I believe you spoke briefly with Dave north of Kitchener. About his injection system. You should have a good look at it as it works very well. I did a lot of the work and tuning. Let me know if you would like to chat about it, I am local to you as well.

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Syscrush
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Re: Weighing Fueling Options

Post by Syscrush »

Andrew11 wrote:
Fri May 14, 2021 3:14 pm
I believe you spoke briefly with Dave north of Kitchener. About his injection system. You should have a good look at it as it works very well. I did a lot of the work and tuning. Let me know if you would like to chat about it, I am local to you as well.
That's awesome, thanks! I'm gonna shoot you a PM.
Phil in Toronto
A cool guy deserves a cool bike, a dork needs a cool bike...
Pics of Perry, my '79.

Andrew11
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Re: Weighing Fueling Options

Post by Andrew11 »

Sent you a pm. Let me know if you got it.

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Syscrush
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Re: Weighing Fueling Options

Post by Syscrush »

I'm planning to pull the carbs from my bike sometime in the next month or so in order to have them as a reference for designing custom EFI throttle bodies.

My cousin and I will be doing the work together, in a shop that's well-equipped with air tools, hoist, jacks, etc. Neither of us is a pro mechanic but both have worked on cars and bikes for fun. We've both done carb work on old bikes, but neither has pulled CBX carbs before. Is it ambitious to think that we should be able to get this done in ~4 hours? Looking at Mike Nixon's instructions for removal, it looks like this would be doable in 1 hour for someone who's done it before and who knows what's going on. So I'm thinking that 4 hours for 2 guys fumbling a bit should be a safe estimate.
Phil in Toronto
A cool guy deserves a cool bike, a dork needs a cool bike...
Pics of Perry, my '79.

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Re: Weighing Fueling Options

Post by Larry Zimmer »

Easy pull in 4 hours. Should be less for 4 hands. If everything is stock, you will need to roll the engine. That means dropping exhaust, etc. Still, two guys and 4 hours -- no problem. Tip: detach the cable at the grip and remove the cables attached to the carbs. Trying to detach cables from carbs while on the engine is a 'challenge'! Have fun. Let us know how the EFI project does.
Larry Zimmer
cbxlarry@sbcglobal.net

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wyly
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Re: Weighing Fueling Options

Post by wyly »

I don't recall how long it took the first time I did it but it wasn't quick, 4 hours would be a good guess and I was alone. More like 6hrs putting it back together.

I've done it a number of times now, last time and it took about 1.5-2 hrs to tilt the engine pull off the carbs for a quick check then tilt it back up into position and torque everything up. Much quicker but I still don't look forward to doing it.

Pliable intake and airbox rubbers certainly help and a bit of grease. When it comes to putting it back together I'd hold the carbs in one hand and slowly pivot the engine up with a small floor jack tilting it back into position, gently squeezing the carbs between the two sets rubber. When it goes well they almost pop back on but you need to constantly check that they're lined up as you go.

Most difficult part I still struggle with is re-connecting the throttle cables, lots of cursing seems to help.
CBX a work in progress, still improving...GS1150EFE completed and awaiting modifications.....RD350, remnants in boxes scattered throughout the garage

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Re: Weighing Fueling Options

Post by Rick Pope »

It's been a while. but I used to pull a rack of carbs from an early model in an hour and a half. Doubt I could do it in 2 hours now. A pair of smaller hands is nice to have helping put the cables back on. I'm lucky that my wife is a willing participant on things mechanical. A light mist of WD-40 on the intake boots helps.
Rick Pope
Either garage is too small or we have too many bikes. Or Momma's car needs to go outside.

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