Author Topic: 1972 CB750 Four K2 -- Rebuilt to NEW OLD STOCK -- PIX ON PAGE 50 (Read 244891 times)

edwardmorris · « **Reply #1175 on:** June 17, 2015, 09:15:55 AM »

Quote from: seanbarney41 on June 16, 2015, 10:10:27 PM

Quote from: edwardmorris on June 16, 2015, 09:54:42 PM
Quote from: seanbarney41 on June 16, 2015, 09:17:33 PM
You are probably gonna have to get good at pulling the tank on and off...it's inevitable. Best quality fuel line makes all the difference...guessing you are fine there and sourced oem Honda 5.5mm
Yep, all new/nos stuff throughout just for that reason. So I think its most likely stuck floats in 2 and 3. It's itching to start, fires really nicely on 1 and 4 at 3000RPM with choke on and throttle pulled ever so slightly, dies off as soon as I let go. Pulled the plug on number 3, its dry as a bone so its getting nothing. I was dumb enough to think that since 1 and 4 are working, fuel is in all 4 (still might be) via the T joints. I know the floats are right next to that. I had made sure they were moving freely when assembled but you never know. I did try tapping them loose, no luck. Too tired right now to think and act clearly, will sleep on it and figure out how best to drain the bowl without gas spilling on my clean engine. I really wanted it running tonight
cut a little pan from the bottom of a plastic soft drink bottle, crack the float bowl drain open, and let it drain into the mini drip pan...then rejoice in the convenience of the 750's easy access float bowls, just snap the clip and your in there...

Easier said than done

Dropped bowls on 2 and 3, they drained a few drops of gas, that's it. The floats are moving freely as ever, so not sure what to do next here besides trying again. I'm assuming if there was a points issue, there wouldn't be any spark at all?

edwardmorris · « **Reply #1176 on:** June 17, 2015, 10:11:30 AM »

Well, went back out there, now #2 is overflowing like there's no tomorrow and still no gas in #3. Floats were set to 26mm at assembly, why is this happening?

evanphi · « **Reply #1177 on:** June 17, 2015, 10:19:56 AM »

Take the float (pin out to the side, drop float) out of 2 and 3 to ensure no debris in the needle valve. The needle should drop out when you take the float out... be careful not to lose it!

edwardmorris · « **Reply #1178 on:** June 17, 2015, 02:08:56 PM »

So it seems that I'm dealing with sticky floats, as in they're sticking to the damned bowl walls. Once I dropped bowls on 2 and 3, checked things and put them back, 3 was dry and 2 started overflowing. Fixed that, checked again, 3 was still dry 4 started overflowing. Fixed that, squeezed the floats together to clear the bowl walls (thanks Bill) and gas rushed through and filled it. Still need to drop the 1 bowl and squeeze the floats together, its very hit or miss with that one.

Half a kick and it started right up, firing on all 4 for the first time, but the idle is stuck at 4000RPM even after fully backing off the idle adjust screw. I had bench synced them with a machinist's wire following the manual's instructions and leaving 1-1/2 thread visible on the top. Don't think I have choice but to take the tank off and keep working.

Restoration Fan · « **Reply #1179 on:** June 17, 2015, 02:57:44 PM »

I HIGHLY recommend that you purchase one of these. Go ahead and pull the tank, hook this guy up and get all of your testing done with it.

http://www.amazon.com/dp/B004NV42PQ/ref=sr_ph?ie=UTF8&qid=1434577861&sr=1&keywords=motion+pro+auxiliary+fuel+tank

edwardmorris · « **Reply #1180 on:** June 17, 2015, 04:17:51 PM »

I have that along with Morgan Carb tune, will use it for the sync, I think I'm about to wrap it up here, firing on all four, just need to figure out the idle. I lower the slide heights, probably a bit too much as it won't hold anymore, may have to raise them back a notch again.

calj737 · « **Reply #1181 on:** June 17, 2015, 05:17:24 PM »

I learned an interesting thing from James, the 550/750 floats look nearly identical. But the 550 floats are wider and catch on the sides of the bowls. Side by side, you can clearly see the difference. DusterDude just dealt with this issue.

Don't know if thats plaguing yours, but worth a peek if they hang up again (compare to original floats in your other bike).

edwardmorris · « **Reply #1182 on:** June 17, 2015, 06:31:36 PM »

Quote from: calj737 on June 17, 2015, 05:17:24 PM

I learned an interesting thing from James, the 550/750 floats look nearly identical. But the 550 floats are wider and catch on the sides of the bowls. Side by side, you can clearly see the difference. DusterDude just dealt with this issue.

Don't know if thats plaguing yours, but worth a peek if they hang up again (compare to original floats in your other bike).

Unfortunately neither bike came with original anything except the carb bodies. I have all NOS brass in there, part numbers are right for the 750. They weren't too bad, gentle squeeze and they're all behaving now, filling up fine and not overflowing anymore. Bigger issue was the slide height which was causing a 4K idle. Had to use the Bat Phone, slide height correct now, idles well under 1K (raised it since).

Oil pressure is good, I can't thank Ron/MCRider enough for loaning the gauge to me, I had an order with Joker machine but they said it would take five weeks. Crappy thing is, it took me longer than that to get it running. But, looking at that gauge when the engine ran properly the first time, I was so relieved the internals are good, something for which I'll always owe Ron.

Backtracking a little, this is the gas tank latch pin that was holding things up. Had JT overnight it so I could get it running. Didn't take pics of the NOS gas tank cap and petcock installed, but their part number pix are earlier in the thread.

seanbarney41 · « **Reply #1183 on:** June 17, 2015, 06:39:33 PM »

EXCELLENT!...everybody loves this project and you are getting all the best help and kicking ass

edwardmorris · « **Reply #1184 on:** June 17, 2015, 06:40:09 PM »

Took it out for a spin, has 4 miles logged now, need to get tags before I can hit bigger roads. Has a few kinks that need to be worked out, front brake needs adjusting as it feels like its dragging. Rear brake was hardly engaging, but thanks to some help from Dave Z, I got it adjusted better than it was, still needs some work. Steering is a bit stiff, its expected I guess, need to see what can be done there. The idle had raised itself to 2K after it warmed up, need to readjust that.

Another huuuuuge relief is that its not smoking! The machine shop had a cow about the tight clearance, but they seem to have done it right. I'm afraid to look but I gotta do a close inspection for oil leaks and such, fingers crossed. The JMR (S1??) head is NIIIIICE, man does it want to run away.

Few things left to do like install the gas tank liners, handlebar mirrors, fork lock and cover, caution stickers etc. etc. Want to log some more good miles before trying to time it more closely and do the carb sync. Its getting there!

edwardmorris · « **Reply #1185 on:** June 17, 2015, 06:42:20 PM »

Quote from: seanbarney41 on June 17, 2015, 06:39:33 PM

EXCELLENT!...everybody loves this project and you are getting all the best help and kicking ass

That's something I will brag about all the time now! From the beginning, everyone has been so incredibly great! I LOVE this forum! I wish uncle Tez had checked in too, haven't seen him here in ages

Restoration Fan · « **Reply #1186 on:** June 17, 2015, 07:00:59 PM »

HOLY SHIZNIT! That is one BEAUTIFUL bike, Rafi.
Definite BOTM material there.

You've just now established the standard for a 750 concourse level restoration like the one SOHRon did for the 500 / 550.

Stev-o · « **Reply #1187 on:** June 17, 2015, 07:05:09 PM »

Congrats, you have a runner! I woukd retorque the head bolts now that you have a heat cycle through them.

Davez134 · « **Reply #1188 on:** June 17, 2015, 07:39:43 PM »

Oh yeah!!!! That bike is amazing. Takes a bit of shakedown, trial/error, but you will get everything perfectly adjusted soon. I'm sure of it! Great job!

danyo · « **Reply #1189 on:** June 17, 2015, 07:55:24 PM »

I'm speechless !!! Really

edwardmorris · « **Reply #1190 on:** June 17, 2015, 09:29:44 PM »

Thank you all for the kind words, no doubt it wouldn't have been possible without all of you.

@Ron/Resto Fan, its not done yet, I'm still behind Jerry H's K2

SOHC4 Cafe Racer Fan · « **Reply #1191 on:** June 17, 2015, 09:32:40 PM »

Amazing!!!

Tews19 · « **Reply #1192 on:** June 17, 2015, 10:47:41 PM »

BOTY nomination! You have to do a side by side of the before and after pics. Congrats Rafi. Now how far are you from Wi? I can take a spin down there and check out your art work.

SOHC4 Cafe Racer Fan · « **Reply #1193 on:** June 17, 2015, 11:39:35 PM »

Quote from: Tews19 on June 17, 2015, 10:47:41 PM

BOTY nomination! You have to do a side by side of the before and after pics. Congrats Rafi. Now how far are you from Wi? I can take a spin down there and check out your art work.

Sure looks like a sure fire nominee for August BOTM.

Tews19 · « **Reply #1194 on:** June 18, 2015, 04:36:27 AM »

Check your tire pressure. They look low in the pics.

evanphi · « **Reply #1195 on:** June 18, 2015, 08:25:51 AM »

Congrats!. Been fun watching it all come together.

edwardmorris · « **Reply #1196 on:** June 18, 2015, 02:48:32 PM »

Thanks again guys, really means a lot. I should have completed the little bits today, but we were having just too much fun today at the Blackhawks party/rally near downtown Chi. Its insured and will hopefully get temp tags tomorrow, so I'll see what I can get done when I get home tonight.

MCRider · « **Reply #1197 on:** June 18, 2015, 04:18:17 PM »

Quote from: edwardmorris on June 17, 2015, 06:31:36 PM

Quote from: calj737 on June 17, 2015, 05:17:24 PM
I learned an interesting thing from James, the 550/750 floats look nearly identical. But the 550 floats are wider and catch on the sides of the bowls. Side by side, you can clearly see the difference. DusterDude just dealt with this issue.

Don't know if thats plaguing yours, but worth a peek if they hang up again (compare to original floats in your other bike).
Unfortunately neither bike came with original anything except the carb bodies. I have all NOS brass in there, part numbers are right for the 750. They weren't too bad, gentle squeeze and they're all behaving now, filling up fine and not overflowing anymore. Bigger issue was the slide height which was causing a 4K idle. Had to use the Bat Phone, slide height correct now, idles well under 1K (raised it since).

Oil pressure is good, I can't thank Ron/MCRider enough for loaning the gauge to me, I had an order with Joker machine but they said it would take five weeks. Crappy thing is, it took me longer than that to get it running. But, looking at that gauge when the engine ran properly the first time, I was so relieved the internals are good, something for which I'll always owe Ron.

Backtracking a little, this is the gas tank latch pin that was holding things up. Had JT overnight it so I could get it running. Didn't take pics of the NOS gas tank cap and petcock installed, but their part number pix are earlier in the thread.

YW.

Glad to help o a BOTY project!

Terry in Australia · « **Reply #1198 on:** June 18, 2015, 05:47:17 PM »

Quote from: edwardmorris on June 17, 2015, 06:42:20 PM

Quote from: seanbarney41 on June 17, 2015, 06:39:33 PM
EXCELLENT!...everybody loves this project and you are getting all the best help and kicking ass

That's something I will brag about all the time now! From the beginning, everyone has been so incredibly great! I LOVE this forum! I wish uncle Tez had checked in too, haven't seen him here in ages

Well I have to apologise for my absence here Rafi, it's been a crazy year, but all excuses aside, that bike looks magnificent mate, for a "first timer", you've put a lot of "pro's" to shame, what a fantastic job you've done, that bike looks better than new, and I remember them when they were new!

That's definitely a BOTM winner, and a BOTY candidate, for sure! Good job mate, congratulations. Cheers, Terry.

jerry h · « **Reply #1199 on:** June 18, 2015, 07:08:48 PM »

Hey Rafi,

Beautiful!!!! Can't wait till you have some time to take a few more pics! It's been fun keeping up with your progress. Your going to have a lot of fun riding this summer.

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Author Topic: 1972 CB750 Four K2 -- Rebuilt to NEW OLD STOCK -- PIX ON PAGE 50 (Read 244891 times)