Author Topic: 1975 CB750 Build! "Kona" - Sold and gone. (Read 71243 times)

Ravie · « **Reply #175 on:** November 08, 2014, 06:46:46 AM »

What kind of front tire? I've already got two sets of rims so I don't really need more but I could use a good front tire. That way I've only got the rear to buy.

Sent from my Venture using Tapatalk 2

Ravie · « **Reply #176 on:** November 09, 2014, 08:08:30 AM »

Got a head sent off to Rafi (in exchange for a K2 tank. Yay!) this morning.

I think today I may get out in the garage and do my homemade frame kit. I'll take pictures, I suppose. ;-)

edwardmorris · « **Reply #177 on:** November 09, 2014, 12:21:58 PM »

Quote from: Ravie on November 08, 2014, 06:46:46 AM

What kind of front tire?..........

This one, never heard of it but it looks like a good starter tire.

Ravie · « **Reply #178 on:** November 09, 2014, 03:18:05 PM »

I was out looking. I've actually got a useable front tire. Honestly, I have a set of tires I can use to get it rolling. There's a brand new Cheng Shin on the 16" rim I'm going to use on the back. I just know it's cheap and likely a few years old. So I think I'll just use what I have until I can buy a new set of something nice.

Cut the frame for my "frame kit" today. Worked perfectly. Got some Gr5 1/4" bolts and metal lock nuts I'll eventually drill holes for. I'll get a picture eventually. I went to a friends house to use his compressor with my air cutter for that project.

Ravie · « **Reply #179 on:** November 12, 2014, 10:14:16 AM »

Brown shirt Santa brought me another present today! Actually edwardmorris and I did some trading for a K2 tank he had. It needs love but it's in great solid shape. Looking forward to getting some body work done.

edwardmorris · « **Reply #180 on:** November 12, 2014, 10:15:55 AM »

Quote from: Ravie on November 12, 2014, 10:14:16 AM

Brown shirt Santa brought me another present today! Actually edwardmorris and I did some trading for a K2 tank he had. It needs love but it's in great solid shape. Looking forward to getting some body work done.

Is that a bad angle or did they dent it on the left side? They were only two dents on it, one small one on the right front and a mild depression left of the gas cap.

Ravie · « **Reply #181 on:** November 12, 2014, 10:27:04 AM »

I think it's just a bad angle. The depression in the top and the small one were the only ones I saw when I looked at it. I have crappy lighting in my shop.

edwardmorris · « **Reply #182 on:** November 12, 2014, 10:32:09 AM »

OK good, hope it works out for you, looking forward to updates.

Ravie · « **Reply #183 on:** November 12, 2014, 10:52:45 AM »

I'm looking forward to HAVING some real updates! haha

This has to be the most boring build thread ever.

Ravie · « **Reply #184 on:** January 21, 2015, 04:54:15 PM »

Well...

Recently a forum member graciously sent me a copy of Mark's book, which is AWESOME (both that I was thought of and the book itself). I've been reading it every spare chance I get and also doing things here and there with the bike. I got the frame cut and the sleeves made for the "frame kit" but haven't drilled any holes yet. Any recommendations on a good bit? The sleeves themselves I'm going to have to bring to someone with a drill press. My shopsmith is dead right now (control sheeve bearing disintegrated)...

Several months ago I disassembled the carb rack and scrubbed down the carbs, but was hesistant to take them apart without knowing anything. Now that I have Mark's book I had a fire lit up my rear and decided to do that today (in the livingroom while watching a live Incubus show on YouTube). I took them apart one by one, recording the numbers and making sure each and every port and jet was clean and clear. Good thing, because most of my 40 jets were clogged. All of the carbs have the original Keihin parts in them, and are in good shape, so that's a plus for sure.

All of the carbs have: 105 mains, 40 pilots, 2.0 slide cutaway and 0.8 emulsifier tube. I pre-set the idle air screws 1 full turn out. IIRC the jet needles were set 2nd from bottom. I left them where they were. (I had done the slides previously so I didn't touch those today)

All that is left to do is clean up the floats better, get their heights set and install them. I'm not sure what the best tool for that job is (suggestions? caliper?).

I tested the two voltage regs I had and they test out OK, however I just remembered that the fancy oregon and others' rectifier/regulator is one unit now(and I plan on purchasing one), so I didn't even need to do that... Silly me!

Not a whole lot else has happened. Just getting things cleaned up. I haven't had any money so no other parts have been purchased and no body work has been done. It'll happen eventually.

I did get a really nice Wilson's leather riding jacket from my parents for Christmas this year (my mom is always thinking of my safety...when I bought my first handgun a few years ago she mailed me a slide lock. haha) so I'm looking forward to the day I get to put it on for a reason!

Hope everyone is doing well!

Riceman · « **Reply #185 on:** January 21, 2015, 07:49:52 PM »

Quote from: Ravie on November 12, 2014, 10:52:45 AM

This has to be the most boring build thread ever.

On the contrary,I have just read the entire thread...
quite enjoyable,entertaining,and Ralph Nader sucked!

Ravie · « **Reply #186 on:** January 24, 2015, 08:33:12 PM »

I keep finding things to do to the CB that don't cost any money.

Tonight I:

-Cleaned and degreased the oil pump. Put a new O-ring on one of the spring caps, lightly oiled it and reassembled it

-Did some more degreasing of the lower case half. Took it to the car wash but the one I went to uses cold water so it didn't do much good (cheap bastards..). Bought some engine degreaser and did a better job by hand. Letting it soak now.

-Re-beveled the bottoms of the cylinders since the 836 bore-out removed all of the old bevel. Dremel and 2000 grit did the job.

-Removed some of the sharp casting around the oil return holes in the head. I didn't go crazy, just lightly rounded over the holes.

-Removed the old Steering stem and head races to make way for the eventual tapered bearings.

-The K3 tank I got from a fellow forum member... I thought the inside had some light rust so I poured in a gallon of vinegar and a bit of CLR. Added some nuts/bolts/screws and began to clean it. Turns out it has been coated before and what I thought was rusty crusty stuff was actually failed coating. Not a big deal but it's gonna be a bit of a PITA to remove. I'll leave that mixture in there for a few days and since I'm sure it won't remove it all I'll do something stronger next. Any recommendations? The Works? Acetone? I don't think it was lined because it leaked. I think someone just did it for S&G's. Granted it turns out OK I will probably NOT line it again.

Side note to the tank: my wife wrecked her car last August (her fault, unfortunately) and I've got a guy who wanted to buy it...we did some haggling and as part of the deal he is going to paint my tank for me. Yay! His shop does great work and he's a very nice fellow.

So...Got some more stuff done anyway!

Restoration Fan · « **Reply #187 on:** January 25, 2015, 05:43:41 AM »

Quote from: calj737 on January 25, 2015, 04:58:11 AM

Drain your tank of the vinegar and CLR. Then replace that with Acetone. Let soak. Drain and filter the acetone as you pour it out and re-use it. Don't forget to invert the tank and allow the acetone to work on the underside of the top.

You've created a job for yourself to remove that liner... Be patient, keep draining and refilling the tank. It will all come out but you need to be diligent to get it all out. And acetone isn't cheap, but it's what you need to get that out- and be mindful, acetone will eat the paint straight off your tank!

Also make sure you're in a well-ventilated place or wear a mask because that acetone will get you floating if you breathe it enough.

Ravie · « **Reply #188 on:** January 25, 2015, 06:55:58 AM »

Well thankfully the tank hasn't been painted yet and the paint that is on it is in terrible shape, so I'm not worried about that. I'm doing all of this treating now before it has been painted.

I think the stuff that is in it was probably that Red-Kote people use.

I was thinking probably Acetone. Cool.

That liner was already flaking off, so I'm not sure I "created" the job...it was going to have to come out regardless of my mucking around with it. I just "helped" it. :-D

Ravie · « **Reply #189 on:** January 25, 2015, 07:06:32 AM »

Caswell eh? I had my eye on POR-15 a while back. You think Caswell is more proven?

Yeah, I'm prepared for that. The CX500 tank I had had LOTS of pinholes in it, so if this one only has one or two...it'll still be better than that one.

edwardmorris · « **Reply #190 on:** January 25, 2015, 09:52:18 AM »

K3 tank? If you're talking about the one from me, its a K2, but yea, sorry for your troubles, the PO on that bike was exceptional. It had gas in it as long as it was here and I had no idea it was coated. When I emptied and dried it for shipping I really couldn't tell or I'd have let you know. Hope you figure it out though, good luck. Worst case, there's another tank with some psychotic paint sitting on my K3 that you can have. I still haven't braved to remove that duct taped gas cap and peek inside

Ravie · « **Reply #191 on:** January 25, 2015, 11:39:45 AM »

Ok, I couldn't remember. Yeah it's not a problem. It was an even swap in my head even with the PITA of that coating. I went and got some Acetone at Ace and I've got a bunch of drywall screws and other various nuts and bolts in it now. I'll gitrdone. Just gotta do the cha-cha a bit in the garage. Good thing I've got a Pearl Jam tape and a SRV CD in there... hahahaha

Hey Cal - Here's a video of the last show we did before we quit for over a year.

That's me on the git-fiddle.

Rav

Ravie · « **Reply #192 on:** February 01, 2015, 01:26:27 PM »

How would you jet this setup(?):

836 flat-top pistons
Minor head porting (just massaging the angles a bit)
D8ES plugs planned
2-2 Exhaust system with internal baffling
Stock air box, possibly a K&N filter.

Right now I've got 105's in there which I think will be too small. Maybe 115's would be better? I know there will be some trial and error but I'd like to start with the best jet size I can.

Also, the newer replacement jets look different...will they work as well? Why don't they have the little emulsifier tubes on them like the originals do? I feel like I'm at a kindergarden level of understanding Honda Keihins right now.

edwardmorris · « **Reply #193 on:** February 01, 2015, 02:05:04 PM »

Mark's book has an excellent chapter on the insides and out of the carbs and jets, give it a try. Post up some pix of the exhaust you want to use, big factor in deciding on the jet size. For 836, I haven't read of any that use smaller than 120, but again, exhaust might change that

Ravie · « **Reply #194 on:** February 01, 2015, 02:30:41 PM »

I figured out why I was confused about why the replacement jets looked like they didn't have the emulsion tube for the needle jet...because they're TWO PIECES. Mine gave me no indication that those were two different parts and the main jet was actually screwed into the needle jet holder. I went to a motorcycle show today and bought a nice unused Clymer manual and was looking at the parts diagram and figured that out. WOW.

Yeah I've read his carb chapter. I'll go snap some pics and be back.

Man I feel dumb. lol

Ravie · « **Reply #195 on:** February 01, 2015, 03:18:08 PM »

Alright, here are some crappy pictures of my exhaust. I have another one too that is also a 2-1 setup but it's ugly. I like this one better. I have the worlds crappiest Nikon. Sorry.

Also pictured is the float needle I was telling Cal about on the phone the other day. spring loaded nipple.

I suppose I could drill those holes bigger on that baffle plate if I felt like it.

Ry

Ravie · « **Reply #196 on:** February 02, 2015, 08:03:54 AM »

Really wish I could tag folks in threads so they'd know to come in here with their knowledge!

Went to a show in Lawrence, KS yesterday. A few really nice bikes. Man those 70's Ducatis are sexy. Managed to pick up a nice Clymer manual. Between that and Marks book I've got lots of good info now!

Sent from my Venture using Tapatalk 2

edwardmorris · « **Reply #197 on:** February 02, 2015, 08:40:32 AM »

Float needle is toast.

Factory manual is a better companion for HM book, Clymer and others are known to have errors (from what I read here, I don't have one on hand).

Exhaust looks a bit too restrictive, is it the only option?

Ravie · « **Reply #198 on:** February 02, 2015, 10:25:13 AM »

Toast? That's not the needle end..not as dirty as it looks in the photo...

I have another exhaust but its not as nice looking. Ill pull it out. Why not just drill this one bigger?

Sent from my Venture using Tapatalk 2

Yoshimoto · « **Reply #199 on:** February 04, 2015, 06:18:05 PM »

Quote from: Riceman on January 21, 2015, 07:49:52 PM

Quote from: Ravie on November 12, 2014, 10:52:45 AM
This has to be the most boring build thread ever.

On the contrary,I have just read the entire thread...
quite enjoyable,entertaining,and Ralph Nader sucked!

When I was a little younger, I contributed $25 to Ralph Nader's campaign fund because you got a free t-shirt with the donation. I then wore the shirt to my parent's house just to push my Dad's buttons. Worked like a charm. 25 bucks well spent.

News:

Author Topic: 1975 CB750 Build! "Kona" - Sold and gone. (Read 71243 times)