Topic: Round Top K Carb fitment

[Mr Freeze]

So, I'm getting ready to fit the 74' roundtop K carbs to my bike and was wondering about fitment of the idle solenoid valve and where you guys have attached it?

Pictures would be good too if anyone has any.

[raymond10078]

I'd be surprised if anybody has tried.

The 76K (and earlier) carbs have a different operating mechanism than the A bikes (the slides are lifted using a different pivoting system).

Most that I've talked to (about round tops) just lived with the lack of idle control - claiming that it was well worth it.

Hopefully others will chime in . . . .

[dusterdude]

Idle solenoid valve?never heerd of it

[raymond10078]

The idle solenoid is unique to the "auto" bikes.

[salukispeed]

I am prepping a set of K5' round tops for my 77A along with the K5 cam and will try it without for the initial tests.

[dave the welder]

you can live without it.i have had round tops on my 77 for over a year now and will never go back.i got lucky(i guess)as my bike idles very good both i neutral and gear.yes the idle will drop some when you put it in gear but if it bothers you to much slip it in neutral.after all on regular 750s you pull in the clutch when you stop or leave in neutral,and when the light turns green you pull in clutch,shift into gear and take off.the improvement on power is worth the lack of automatily having the idle speed rise just a little

[Mr Freeze]

Honestly I wasn't that worried about it. I guess I just wanted to know if it was neccessary. I got the carbs in the first place after reading of their improvements to the bike on this forum. I also have a 74' camshaft going in as well.

[Mr Freeze]

I'd be surprised if anybody has tried.

The 77/78K carbs have a different operating mechanism than the A bikes.

Most that I've talked to (about round tops) just lived with the lack of idle control - claiming that it was well worth it.

Hopefully others will chime in . . . .

I don't think it's about a lack of idle control, because you still have the idle speed control on Roundtops. My question had more to do with the drop in idle that happens when you switch into gear and whether fitment of the Idle Solenoid was necessary.

[raymond10078]

The slight throttle opening (beyond the typical idle speed screw setting) that the soleniod/dashpot system provides when the bike is in gear is exactly what I'm calling "idle control", as that system's purpose is to keep the idle speed relatively steady - regardless of in gear or not.

So . . . my comments remain applicable to your question.

[hazardus320]

I bought a pair of k4 roundtops with their boots and and cleaned them up.  Got some pods for them too.  When trying to mount them I noticed that the arm/bracket that anchors the throttle cables hits on the frame.  If I remove the arm/bracket the carbs will go on nicely.  I can snap some pictures and put them up after work.  Any ideas to alleviate this issue?

I also got the cam from the k4 which I will install soon as well and try to keep you posted to any issues or tips I have found in doing so.

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[dave the welder]

you can bend the bracket slightly for clearance if need be.when I did mine it was very close.it just cleared the frame

[hazardus320]

That's not a half bad idea I will bend it to clear the frame and bend it back after.

Edit: got them on after a slight bend to it!
Here's a pic.


And another


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[salukispeed]

Pod question

My only expierence with intake Pod's on a Honda was with a 1974 CB750 K model and I had a difficult time with consistant fuel/air delivery in heavy rain or a heavy cross wind. it seemed to badly affect the  driveability during light cruise down the highway in a cross wind. Full throttle was no problem at all.  I see so many people running pods on there 750's when the stock air cleaner top already has the plenum and proper length velocity stacks in it. Has anyone run there "A" with round tops and stock air cleaner top. You can run a K&N air cleaner and add some 1 inch holes in the rear of the lower box to free up some air flow and still control the flow in bad weather. The pods may look better but do they work as well or consistantly?
Thanks

[dave the welder]

I am using the stock air box with a 35 year old K&N filter.just to let you know the rubber velocity stacks are slightly smaller and I could not get them on for love or god so I used the stock air box that came with the carbs

[Mr Freeze]

I'm curious if you guys ran any different jetting or changed clip positions on the needle?

I'm running the original 2 - 1 dual exhausts that came on the 78 models and I'm running the Steel Dragon Air boxes which pretty much mimic the stock airbox.

[dave the welder]

stock settings on my carbs