Topic: CB750 K0-1

[Don R]

 I decided to start a new build thread, this bike is my #4 K0 which is a late number K0 with a 71 title. I'm assembling all of the K0 parts I have and can find so I can move this bike to a new home. I have too many bikes to keep them all licensed and their carbs clean.

 This one was previously listed for sale but got no takers here, since then I've added a correct front end with a Tokiko 1 caliper and a square edge rotor. It now has an unbroken top triple and will get a decent set of K1 gauges. It has a decent rear wheel now, riding on an early K0 swingarm, rider quality fenders with a single cut front. Frankenbike sidecovers and a nice K1 tank. I dug out the controls, cables and have correct carbs.
 The original engine was toast but I have swapped different internals into the original cases. I have a really nice stock top end but it's from a K5, I'm undecided about using that.
 Next up, is to make a shopping list of quality reproduction parts. I also have a set of ultra rare and hard to get... L0L!,  Busso 4 into 4 no number pipes that may go on it.

[newday777]

Cool Don another project to get more room.
I might have a good K0/K1 top end available.

[BenelliSEI]

Don….. I have some “left over” parts too. Let us know what you need.

[Don R]

 I spent last night looking for K0 rear turn signal hardware, even Yamiya didn't list it except complete for $117, that might be the deal. Crazy right? I have the mounts but wanted just the rubber parts, sleeves and washer. Bike barn has the hard parts and ebay has the rubber. I think I used some sheet rubber on another bike, I might upgrade a keeper bike and just do a swap. The grab handle went on the K1 Rat Race, it will be fun finding it all.

[69cb750]

This one was previously listed for sale but got no takers here, since then I've added a correct front end with a Tokiko 1 caliper and a square edge rotor.

When was square edge rotor used ?

I spent last night looking for K0 rear turn signal hardware, even Yamiya didn't list it except complete for $117, that might be the deal. Crazy right?

I've ordered five signal bracket sets, often missing, fortunate Yamiya has them.

[Don R]

 The square edge rotor hub was on sandcast and 1970. I'm not sure when they went tapered.

[Stev-o]

Subscribed....

[seanbarney41]

...me too

[Don R]

  I got one rear signal mount complete with sleeve and rubber parts for $12.50 on ebay lol.
  I'm going to dig out the K0 Seat and go to JoAnne fabrics for some polyester padding and filler and try to assemble an original red foam seat with a new cover. It's got a repop k1 seat now, but it has another destiny. 
  There's a couple totes of K0 stuff on the shelves. The box of new parts didn't reveal a lot. My plan is to assemble everything that I can find into a rolling parts assembly.
  The estate sale bike I nabbed last year had a new old set of K1 gauges, I really want to put them on the Rat Race but they would be a tasty temptation on this one too.
  The gauges, 4 cable carbs and Busso 4-4 pipes add value but is it going to drive the price up too high?
 

[Don R]

 I did some looking and the CB750 K0 turn signal rubbers and hardware are the same as 75 cb400F, Yamiya had them listed for a 400F so I got two sets, a single pull cable bottom for a right control, three single cable throttle tubes and two sets of grips. With the $25 shipping it's about a C note.
 I may still order a red seat foam and re-build a seat for a keeper bike. The Nugget has a reproduction seat with red foam "inserts" L0L!

[MauiK3]

Cool!

[bek1966]

Sounds like another fun project to follow, subscribed!

[Don R]

 I think I'm the only guy ever to break a Frankenbike side cover. It was winter and I just grabbed it and jerked it. Crack. Today I see than I've somehow done it again, a half inch from the superglue repair from before. From the bottom to the louver hole dangit. I may do a fiberglass interior patch.
 A grab handle was left off of the order, fudge. I went through the tote of K0 stuff on the shelves, I found a nicer two hole taillight bracket and two spare 4-1 carb cables.
  Two totes can get condensed into one, another goal reached.
 

[Don R]

   I dug out the last boxes of K0 stuff, now I see that it needs hardware for the K0 airbox, carb rubbers and airbox rubbers. I'm thinking of laying it all out on the driveway for a picture.

[Don R]

 I got one K0 rear turn signal bracket with both rubber parts and the sleeve. $12 and change shipped on ebay, don't really need it, but it was a deal.
  Then I was looking at faded red sidecovers for $200 until I saw one was broken. A guy might need therapy.
 

[BenelliSEI]

I got one K0 rear turn signal bracket with both rubber parts and the sleeve. $12 and change shipped on ebay, don't really need it, but it was a deal.
  Then I was looking at faded red sidecovers for $200 until I saw one was broken. A guy might need therapy.

Ha! The last red one I bought on EBay had two tabs missing! The pictures only showed it on a bike (they looked good).

[Don R]

I got one K0 rear turn signal bracket with both rubber parts and the sleeve. $12 and change shipped on ebay, don't really need it, but it was a deal.
  Then I was looking at faded red sidecovers for $200 until I saw one was broken. A guy might need therapy.

Ha! The last red one I bought on EBay had two tabs missing! The pictures only showed it on a bike (they looked good).

   That sucks, one of the plumbers on my last Hospital job bought a Yamaha gas tank off of ebay, the side not shown in the pics was smashed in. Not mentioned in the description, he just took his lumps, I encouraged him to file a claim.

[Don R]

 I put a pair of K1 gauges on the JDM unicorn triple tree, they could use faces but are all there. The left control had two wires missing the bullet ends, I fixed that and fed the wires through shrink tube. Film at 11.
 I'm debating whether I want to spend the $$ for a repro seat, the pan I have is pretty roached and the red foam keeps becoming more pieces.
 

[BenelliSEI]

Don…. Building the seat for my Sandcast was a pain, but I have to say the Yamiya red foam kit and their K0 seat cover where perfect replicas and looked every bit the part when I got it all together. If you have a solid pan and trim bits, worth the expense and hassle….

[Don R]

 That does look nice, I wouldn't waste a red foam on this seat pan though. I'm thinking it's time to buy one before the new tariffs take place. I'm trying to keep this one nice but also cheap for someone to own.
 I installed a new red foam under the original seat cover on my Sandcast and my blue-green bike got a sweet original, if slightly wrinkly original seat from someone here. The nugget is sporting a re-pop seat, I think from DSS.
  The Yamiya white foam seat is 10% off this month also.

[Stev-o]

  I'm thinking it's time to buy one

How much are they, Don?    I've always thought the seat is such an important cosmetic part on a bike, typically worth the price.

[BenelliSEI]

I’ve never bought one of those, but I did notice it would have been about the same as what I spent restoring mine! I bet it’s a lovely seat. Go for it!

[Don R]

 The complete Yamiya K0 red foam seat is $520 plus around $75 shipping, the white foam seat is $320 on sale 10% off this month.
  I spent some time mining the parts totes for K0 stuff, K1 gauges, seat hinges and latches, I also dug out some drag bike parts and put them on the shelf near their intended destination. There's a K1 frame on the shelf that wants to donate a rear inner fender, coils and wiring harness. I'll remove the broken triple trees to lighten it too.

[RAFster122s]

You mentioned tariffs, tariffs on electronic will be going up early next year, might want to look into that and if you need new electronics make your purchases before that goes into effect.

[Don R]

 I pulled a K0 type battery box, coils and wiring harness off of a factory replacement parts frame on the big shelf. The blinker rubber is intact but like always, the fuse holder tab is ripped off.
 This virus I've had for a week is finally letting up a little so I can do some decent shop time.

[Don R]

 I dug through two totes of old wiring but I'm glad I had it because there was a good early battery positive cable. The battery box is mounted, tool tray, wiring harness loosely in place, pos. and neg. cables located, ign. switch and bracket, coils and wires.  etc.

 The top pic is my old K1, shoulda kept it.

[Don R]

 Doing a little wiring today, I ran across my battery cable building tools and had some red cable left. #6 fine strand. I decided to use the nice stock one though, I'll make a new one for the Rat Race though.

[Don R]

 The Rat Race bike donated a grab handle, it has no center stand anyway and it didn't make sense to have the extra weight on a race themed bike.
  What's you guy's thought on correct vin number on the motor. This one was junk except the cases, I really don't want to build an engine. A Honda collector visited a couple months ago and said a correct engine case is only worth a couple hundred difference. He's also a professional appraiser. I have a complete K3 motor under the shelves that could slide right in. Then the K0 carbs, air box and Busso pipes.
 

[Don R]

 Where do all of the taillight wires disappear to? I dug through a full tote of old wiring to find a set of correct color wiring to make up a set of harness to taillight wires. Those barn- find, rusted out and cut up bikes do have some value to add to another project. 

[seanbarney41]

last spring I fixed up a K3 that had broken cases, seized cylinder, broken spark plug stuck in the head, god only knows what else...so I had a K6 engine that was good to go and popped it in there so I could sell it.  Lots of potential buyers acted like the K6 engine was a big downer on value, but really they were just trying to lowball and when I came down on price the fools stlll flaked.  And these were the same face book posers that wouldn't know the differences except that I put that it was a wrong year engine right in the ad.  So just let the busters try and figure that stuff out for themselves.  Otherwise they just miss out on a really solid deal.