Author Topic: Cb750F Low Boy  (Read 5714 times)

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Offline fdbrat

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Re: Cb750F Low Boy
« Reply #25 on: December 11, 2013, 08:25:15 AM »
I'm also picking up a non seized cb750f engine with a new gasket kit for $150 bux from the same dude.   :D   :D  :D I'll build this engine over time. So when I need it it will be there.

I am overly thankful. I've spent about $500 on this bike. I've been waiting for all the right parts. Oh and she has all the right curves. Haha.
1975 CB750F
4-4, Dyna S and box
5 ohm coils / 5k ohm caps
In- .05 / Ex- .08

San Luis Obispo

Online Don R

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Re: Cb750F Low Boy
« Reply #26 on: December 11, 2013, 09:23:07 AM »
Check out Lowriders by Summers and Fast from the Past. Lowriders has a lot of proven lowering parts (the music is cool too) and fast from the past has an awesome fork brace that would look #$%*in on your bike.
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Offline fdbrat

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Re: Cb750F Low Boy
« Reply #27 on: December 11, 2013, 09:53:31 AM »
I'd like to put both fork braces on. One for the tubes and a set for the lowers.

Ill visit LBS, but I have already lowered my bike quite a bit.

In the future ill be adding the Spitfire sprung struts. From what I've read they are not soft at all, but I figure it will relive a bit of stress from the frame.
1975 CB750F
4-4, Dyna S and box
5 ohm coils / 5k ohm caps
In- .05 / Ex- .08

San Luis Obispo

Offline fdbrat

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Re: Cb750F Low Boy
« Reply #28 on: December 13, 2013, 10:07:05 PM »
UPDATE:

I noticed the other day there was some JB weld in front of the drive sprocket.

And my X-ring chain was rubbing a bit off.

I didn't like that. Counted the teeth there was 18. Checked on my spare engine t had the 17.

Well I cleaned up the 17 and put it in there.

I've read that the 550's had problems with the newer style chains. And I learned that the oil pressure right there isn't very high. Glad to hear that.

Do you guys think I could get a guy to patch up the aluminum case?

Or clean off the JB weld and reaply?
1975 CB750F
4-4, Dyna S and box
5 ohm coils / 5k ohm caps
In- .05 / Ex- .08

San Luis Obispo

Offline fdbrat

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Re: Cb750F Low Boy
« Reply #29 on: December 15, 2013, 12:24:24 AM »
Made this tonight. New kicker.

1975 CB750F
4-4, Dyna S and box
5 ohm coils / 5k ohm caps
In- .05 / Ex- .08

San Luis Obispo

Offline fdbrat

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Re: Cb750F Low Boy
« Reply #30 on: December 15, 2013, 07:26:56 PM »
1975 CB750F
4-4, Dyna S and box
5 ohm coils / 5k ohm caps
In- .05 / Ex- .08

San Luis Obispo

Offline fdbrat

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Re: Cb750F Low Boy
« Reply #31 on: December 19, 2013, 04:12:07 PM »
Seems like ill be buying some new carb boots. Mine have no cracks but are very hard. I pressed on the carbys and the idle went down quite a bit. And I have some investigating to do. Cylinder 4 (pipe) takes for ever to heat up. And the plug is nice and wet.

No stress. Just means ill be running a fine tooth comb through everything.

1975 CB750F
4-4, Dyna S and box
5 ohm coils / 5k ohm caps
In- .05 / Ex- .08

San Luis Obispo

Offline SOHC Digger

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Re: Cb750F Low Boy
« Reply #32 on: December 19, 2013, 04:23:58 PM »
Keep up the good work!

Offline fdbrat

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Re: Cb750F Low Boy
« Reply #33 on: December 21, 2013, 09:05:55 PM »
Thanx digger.

Well I fixed all the air leaks. Those old intake clamps attached to the engine max out over time. So I pushed em closer to the engine where the rubber steps up a bit and that made the boots air tight! Wooo.

Pulled the carbs yet again and readjusted the floats... Number 4 was the cylinder not getting hot as fast if at all. It's needle is a bit on the tired side. I guess after sitting for 10 years, it takes a bit of time for things to settle in again.

Pulled the valve cover and adjusted all the valves. Some loose, some tight, and some just right haha. Now they are all perfect.

This time around I got the sync a lot closer. But number 4 slide needs to come down a bit. It seems to be the suspect of sticking. When I give it a nudge the idle comes down.

Now when I snap the throttle the idle comes right back. No floating.

LOVE LOVE LOVE IT.

Jets are 125 main and slows are 45. Not sure where the needle is. Don't look a gift horse in the mouth. Ha.

1975 CB750F
4-4, Dyna S and box
5 ohm coils / 5k ohm caps
In- .05 / Ex- .08

San Luis Obispo

Offline fdbrat

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Re: Cb750F Low Boy
« Reply #34 on: April 10, 2014, 10:19:49 PM »
Mmmmm
1975 CB750F
4-4, Dyna S and box
5 ohm coils / 5k ohm caps
In- .05 / Ex- .08

San Luis Obispo