Author Topic: Project 1971 CB450 K4 Twin DOHC (Read 8607 times)

Simpson · « **on:** June 21, 2010, 08:41:25 AM »

Well I bought it local 04-19-2010 for 500 bucks. The speedo mileage shows 7400. The pipes, frame, fenders and engine look fair or better. I did a compression test before getting it and the right side was lower. Perhaps after the years some rust has unseated the piston rings. Good chance after 5-6 hours of run time it could set back in. 40 year old bikes can do strange things. The plan is to use more elbow grease for this restoration. Less NOS purchases and more refinishing surfaces. This will not be a show bike and will try to keep the cost down. This will be the old Bonneville, I will never buy...

End product will be back to original Gold with black stripe.

Simpson · « **Reply #1 on:** June 21, 2010, 08:47:35 AM »

This is my goal...

Simpson · « **Reply #2 on:** June 21, 2010, 08:51:42 AM »

It's alive
Need to replace the starter sol. so I had to jump it.
Just a quick video...

Simpson · « **Reply #3 on:** June 21, 2010, 08:56:55 AM »

Here's about the latest picture...
Parts being painted and engine, frame in mid stream restoration.

Elniniomuchachos · « **Reply #4 on:** June 21, 2010, 11:10:20 AM »

Cool bike! I've been wanting one of those little twins for a while, and found a 450 on CL... Maybe I'll go get it?

Simpson · « **Reply #5 on:** June 21, 2010, 09:16:02 PM »

Parts sent to painter. Changed my mind. Will now have white stripe to fully match 1970 model.

Simpson · « **Reply #6 on:** June 21, 2010, 10:01:13 PM »

The paint should match the NOS badges I picked up nicely.

knowsnothing · « **Reply #7 on:** June 22, 2010, 08:06:22 AM »

Hey Simpson looks great!

What did you use to make the engine so shiny and did you have to pull it?

Simpson · « **Reply #8 on:** June 22, 2010, 08:49:22 PM »

Quote from: knowsnothing on June 22, 2010, 08:06:22 AM

Hey Simpson looks great!

What did you use to make the engine so shiny and did you have to pull it?

I had every intention of pulling all covers off for sanding and buffing with mother's compound out to a shine. While surfing in ebay, I found a guy selling a full cover set for 88.88.

It wasn't perfect but the bike isn't meant to be concourse either. At that price I could not resist. He sent a clutch cover additionally for free but never polished it out. I cleaned with carb cleaner and applied a heat resistant clear coat to it. Bolt on with new screws and gaskets. Done!

The clutch cover is on my list this weekend along with refurbing the seat.

The nos stator cover was around 25 bucks on ebay. The nos emblems were about the same amount.

The exhaust sytem was all buffed out using mothers and fine steel wool.... Seemed to work fairly good.

Retro Rocket · « **Reply #9 on:** June 22, 2010, 09:49:01 PM »

Gday mate, i don't know if you are interested but someone on this site has a set of Shoei hard bags for a 450, like the ones that look so nice on your 750......would look good on this one as well....

Mick

Simpson · « **Reply #10 on:** June 22, 2010, 09:50:58 PM »

Quote from: retro rocket on June 22, 2010, 09:49:01 PM

Gday mate, i don't know if you are interested but someone on this site has a set of Shoei hard bags for a 450, like the ones that look so nice on your 750......would look good on this one as well....

Mick

Very interested... Do tell more!

Retro Rocket · « **Reply #11 on:** June 22, 2010, 09:58:05 PM »

They are probably in the "for sale" section, i'll have a look and see if i can find them...

Mick

Retro Rocket · « **Reply #12 on:** June 22, 2010, 10:00:35 PM »

OK found them......

http://forums.sohc4.net/index.php?topic=72576.0

Mick

Simpson · « **Reply #13 on:** June 23, 2010, 05:36:51 AM »

Quote from: retro rocket on June 22, 2010, 10:00:35 PM

OK found them......

http://forums.sohc4.net/index.php?topic=72576.0

Mick

Thanks Mick, will investigate.

Simpson · « **Reply #14 on:** June 25, 2010, 07:51:53 AM »

Seat pan painted and cover refurbished.
Very happy with the cover purchased from ebay for 60 bucks.
Has real piping on the seams and a real strap.

Simpson · « **Reply #15 on:** June 28, 2010, 09:46:39 AM »

Update:
Triple tree paint, gauges mounted...

Simpson · « **Reply #16 on:** June 29, 2010, 07:29:05 AM »

I have vacation all week. Rear brakes are a go, electronics are together and carbs with filters done.

Retro Rocket · « **Reply #17 on:** June 29, 2010, 04:22:52 PM »

How did you go with the Shoei bags Simpson?....Looking good mate.

Mick

Simpson · « **Reply #18 on:** July 01, 2010, 06:59:33 AM »

Quote from: retro rocket on June 29, 2010, 04:22:52 PM

How did you go with the Shoei bags Simpson?....Looking good mate.

Mick

I thought careful, and due to financial constraints I'm going to hold for now.
Its a pretty penny to reburb a set nicely.
Not so sure a nice rack with a grab bar might not do the job.

Simpson · « **Reply #19 on:** July 12, 2010, 03:43:27 PM »

Handlebars , controls, master cylinder rebuilt, levers all in working order now...

Simpson · « **Reply #20 on:** July 12, 2010, 03:50:28 PM »

Ran engine and tuned this weekend. Everything seems a GO at this point.
No oil leaks, good engine sound, revs fine, idles and starts good.
Electronics all seem to be in working order.
Waiting on parts from painter. Getting excited.

There seems to be possible chain interference in he counter shaft cover.
While running on the stand I hear a chain rubbing while letting off clutch.
Hmmm...

Engine seems to smoke when hot. Hopefully just needs hard run on the road.

Simpson · « **Reply #21 on:** July 22, 2010, 05:19:07 PM »

status update:
Bike mostly together waiting almost entirely on parts (tank, ears, headlight bucket, air filter covers) from the painter.
Forks rebuilt and refinished by me, so not so great but better.

Simpson · « **Reply #22 on:** August 05, 2010, 01:53:50 PM »

Not complete but fully functional.

Retro Rocket · « **Reply #23 on:** August 05, 2010, 04:21:38 PM »

Very nice....

Mick

MidTNJasonF · « **Reply #24 on:** August 05, 2010, 05:24:53 PM »

Very nice work. I have a 72 450 DOHC I just finished tearing down to the frame for a build up project. I am still in the decision making process on mine. Cafe or Street Tracker is most likely since I was not interested in keeping it stock. Colors and finishes are up in the air as well but I need to find a set of covers like you did so I can experiment with polish, bead blast, anodizing, and/or painting.

News:

Author Topic: Project 1971 CB450 K4 Twin DOHC (Read 8607 times)