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21
CB500/550 / Re: CB550F Main Jets
« Last post by deltarider on Today at 02:51:33 PM »
If you need a rebuild kit.check
Www.cruzinimage.net
Great carb  kit. Quick delivery and good prices
But isn't that the infamous Keyster set?
22
Project Board / Re: CB350f (400) - big bore time
« Last post by Nurse Julie on Today at 02:33:05 PM »
You are doing the leak down test the wrong way round. You need to put the fuel in the inlet and outlet ports, with the springs on, as it is the springs that close the valves, not gravity, and then observe for leaks. And you need proper valve grinding paste to do the lapping in.
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Project Board / Re: CB350f (400) - big bore time
« Last post by taysidedragon on Today at 02:26:54 PM »
Use valve grinding paste to get a good seal. I've always done mine by hand by rotating back and forth, never used a drill.
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Project Board / Re: CB350f (400) - big bore time
« Last post by Erwin83 on Today at 02:21:35 PM »
While I am getting bored, waiting for the cylinders to get bored, (see what I did there... haHAA), a good moment to revamp my cylinder head.

A question about the valves:

First of all, off course I've kept valves very neatly ordered per cylinder.
Next, I've cleaned the valves with the wire brush (brass) and cloth, and the seats as well. Next I cleaned the set (valve and seat) by adding a light rubbing cleaning compound (just household cleaning, this stuff is way too light to actually cut any metal) to the valve and turning the valve in the seat (using a drop of machine oil and a rubber hose on the stem to connect to a drill.
Result is a clean valve seat and uhmm. bum (?). the part that hits the seat at least.

Next, I've checked for leaks by dropping the valves back in the head, and filling the combustion chamber with fuel.
To my surprise, 4/8 are (slowly) leaking fuel. 2 exhaust valves and 2 intake valves.

Is this to be expected? After all, the valves are only closed by gravity, and gravity doesn't affect these teeny tiny valves very much.
Before putting in the time and effort of installing the springs to double check, I'd love to hear from your experiences.

thanks in advance.

(picture is obviously of before the cleaning, there is quite some carbon build-up on the exhaust valves).
25
CB500/550 / Re: CB550F Main Jets
« Last post by Johnwebley on Today at 01:37:26 PM »
If you need a rebuild kit.check
Www.cruzinimage.net
Great carb  kit. Quick delivery and good prices

Sent from my SM-A750FN using Tapatalk

26
CB500/550 / Re: CB550F Main Jets
« Last post by davidrsmith on Today at 01:21:42 PM »
Hi

I got my new jets etc from nrp-carbs.co.uk, they may have what you are looking for.

Dave
27
CB500/550 / CB550F Main Jets
« Last post by cooleronthecoast on Today at 01:11:19 PM »
According to my Haynes manual, my CB550F2 should have 98 size main jets.    I stripped down the carbs this morning to find I've got 3 100's and a 75 which I think is a CB400F size!   I'm looking to buy a set of 4 98's, but I can't find any on ebay or on Dave Silvers website. 

Can anyone point me in the direction of where I can get some please?
28
Project Board / Re: Lets build a SOHC for less than a grand
« Last post by Erny on Today at 12:26:55 PM »
Thanks a lot, now it is clear!
Another item I'll address during looong winter

Any particular grease you would recommend?
Looks mine is turning rather difficult, I suspect grease degraded or too thick
29
Out & About / Re: Anyone out on their SOHC today?
« Last post by SteveD CB500K0 on Today at 11:35:09 AM »
That picture doesn't do justice to the PRR and the scenery John.

Just a quick crop...

[ Guests cannot view attachments ]
30
Project Board / Re: Lets build a SOHC for less than a grand
« Last post by Trigger on Today at 11:26:20 AM »
Remove the seal, it should be reusable unless it is cracked or damaged.
Clean as much of the old grease out so, you can see what you are doing.
There is a wire circlip that needs to be removed and a shim washer under that. Once that is out you can remove the cog.
Take the grub screw out that holds the end cap on and push the end cap out using the drive. You will find a washer on each end of the drive. Inspect these are nice and smooth as, any catching can make the clock needle wave.
Clean up all the parts, re grease and assemble  ;)
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