Author Topic: 1978 CB750K — Post 836 OIL PRESSURE - Hopefully Good!? (Read 251771 times)

Tintop · « **Reply #1250 on:** April 09, 2018, 02:37:00 PM »

Bike looks great.

SOHC4 Cafe Racer Fan · « **Reply #1251 on:** April 09, 2018, 02:54:15 PM »

Chris,

It's been a long time coming, but this has to be satisfying! Enjoy it!

PGF550F · « **Reply #1252 on:** April 10, 2018, 05:56:22 PM »

As a Canuck I have to say it’s a Nice touch with the Canadian flag. I just wish we had a longer riding season!

Restoration Fan · « **Reply #1253 on:** April 10, 2018, 07:08:37 PM »

Chris,
That is one seriously sexy bike. Glad you stuck with it and fixed it.

As someone who has purchased a newer bike (2005 BMW R1200GS), it certainly handles better than my 78 CB750K. But every time I get on the 750 and take it out for a ride, inevitably someone comes up to me and says something like "Man, I used to have a CB750" and strikes up a conversation about it. That doesn't happen on the BMW, which makes it definitely worth the money to keep the older bike.

Good luck with it. Hope it continues to perform well for you.

Ron

MauiK3 · « **Reply #1254 on:** April 10, 2018, 08:13:21 PM »

Wow, what a sight, beautiful and very capable looking.

MCRider · « **Reply #1255 on:** April 11, 2018, 06:48:16 AM »

Quote from: SKTP on April 09, 2018, 10:55:59 AM

Put almost 200 miles on it this weekend...Ring break-in so I am staying pretty mellow and under 5000rpms...looking forward to seeing what it can do now that it is together properly

(These are from the initial test drive just down the block and back. I am not a squid).

New things to-do list:
- Mount front fender lower in the back.
- Get a new headlight bulb that is brighter and works with my bucket/ring.

Very Nice! Those pipes sure bring back the memories. #3 makes a good makeshift case guard, don't ask me how I know.

About the Hlight, if you haven't already, a HondaMan relay setup will get the most from any bulb you use, plus 30% not uncommon.

SKTP · « **Reply #1256 on:** April 30, 2018, 10:14:20 AM »

Ok...I was dumb. These forks are great. Now I need ölhins in the back...90mph on the freeway, front end is like butter

Bennie1977 · « **Reply #1257 on:** May 01, 2018, 05:42:51 PM »

Quote from: SKTP on July 07, 2017, 04:10:05 PM

DaveZ134 seems to have had a similar issue (thanks for the head's up Rafi)

http://forums.sohc4.net/index.php/topic,139768.400.html

BOOKMARKING THE QUICK THROTTLE QUESTION
http://forums.sohc4.net/index.php/topic,167192.0.html

I cannot seem to find a way to get in touch with him.

SKTP · « **Reply #1258 on:** May 02, 2018, 10:51:05 AM »

For me. it turned out that it was 0-ring #13 that was causign the leak not the case-splitting seal

SOHC4 Cafe Racer Fan · « **Reply #1259 on:** May 09, 2018, 08:24:56 PM »

Happy Birthday, Chris!!

SKTP · « **Reply #1260 on:** May 23, 2018, 12:07:37 PM »

So I have about 1000 miles on the bike now. I was shown that my chain was stretched out a fair bit and my mechanic then adjusted it to the tight spot...I then drove the bike over 200 miles (to San Diego and back) upon arrival in San Diego I hear this weird clicking/clunking when I turned the bike off and pushed it around. (listen to video below) I then chose to drive the bike home 100 miles...it drives great but the clicking is still there. I have ordered a new 530 chain and sprockets. I really hope that this is only the chain...Please tell me that it is...I sprayed Wax-lube all over it and it seems to be slightly less now (probably a good sign?)

<a href="Not a valid vimeo URL">IMG_2156[/url]

CBJoe · « **Reply #1261 on:** May 23, 2018, 09:53:35 PM »

That doesn't sound like chain noise

If you pull in the clutch and spin is the click still there?

Is the noise in the transmission sprocket area? Sounds loud enough you could feel it. Have you pulled the cover of and ensured the front sprocket is still attached with both bolts or has a broken tooth?

SKTP · « **Reply #1262 on:** May 24, 2018, 10:07:58 AM »

I pulled the sprocket last night. The sprocket is on and the bolt is tight (there's only 1 on 78s) The sound isn't really there anymore?! I am confused.

MCRider · « **Reply #1263 on:** May 24, 2018, 11:01:01 AM »

Quote from: SKTP on May 24, 2018, 10:07:58 AM

I pulled the sprocket last night. The sprocket is on and the bolt is tight (there's only 1 on 78s) The sound isn't really there anymore?! I am confused.

IIRK: There were some early covers that weren't compatible with an 18t drive sprocket. They would click. Leave the chain draped on the shaft, or use a 17t sprkt, put the cover back on and see if it clicks.

SKTP · « **Reply #1264 on:** May 29, 2018, 08:40:33 AM »

I rode 539.7 miles this weekend. Still has a new sound when rolling in neutral after getting hot. Not sure what to make of that? I've gone over 700 miles in the past 2 weekends. The new 530 chain set up arrives this week. Thinking of getting a Dyna because it sputters when I really twist the throttle. But overall I'm happy and it cruises at 80mph all day

SKTP · « **Reply #1265 on:** June 04, 2018, 12:43:29 PM »

Found out a few things this weekend;

1- my front sprocket was on backwards and was grinding into my engine case, which was the cause of the sound
2- found out that you need a 530 conversion front sprocket to make a 530 chain conversion work with a 78K you cannot use a 1976k from sprocket...
(see other post here: http://forums.sohc4.net/index.php/topic,75700.25.html#quickreply)

I just ordered a 530 front sprocket that I hope will work from here: http://sprocketspecialists.com/ I called them and they physically measured the part for me...Fingers crossed!

seanbarney41 · « **Reply #1266 on:** June 04, 2018, 12:55:26 PM »

What I have done in the past is have the raised portion ground off on one side by a machinist...grinding works better than milling as most sprockets are case hardened

seanbarney41 · « **Reply #1267 on:** June 04, 2018, 12:57:42 PM »

did not know that the standard 530 early sprocket would grind the case, was just worried about sprocket alignment and full thread engagement of the front sprocket bolt

SKTP · « **Reply #1268 on:** June 04, 2018, 01:09:40 PM »

Sorry If I was not clear. My 630 Sprocket was on the wrong-way-round and was grinding.

I have not successfully converted to the 530 set-up due to the 1976 sprocket not fitting. I may have to grind the 1976 one, if the "conversion" one doesn't fit. Will know later this week/weekend.

seanbarney41 · « **Reply #1269 on:** June 04, 2018, 01:11:22 PM »

ahhhh, that makes more sense

madmtnmotors · « **Reply #1270 on:** June 04, 2018, 05:13:32 PM »

The CB650 (79' or 80' I think) front sprocket in 530 pitch matches the thickness/shoulder as the later CB750 630 pitch front sprocket. Check the dimensional diagrams for both on JT sprockets page. I am using the 530 pitch front sprockets for the CB650 on my K8 CB 750's. Rear sprockets are easier to figure out, but some sprocket makers have resorted to "dishing" the center section making them thinner and more difficult to tighten securely before the nut bottoms out on the unthreaded portion of the sprocket mounting stud.

SKTP · « **Reply #1271 on:** June 04, 2018, 05:36:07 PM »

Thanks...I will investigate

Why can't I find a 530 "Clip style" master link?

madmtnmotors · « **Reply #1272 on:** June 04, 2018, 05:42:22 PM »

Quote from: SKTP on June 04, 2018, 05:36:07 PM

Thanks...I will investigate

Why can't I find a 530 "Clip style" master link?

You're welcome, but I can't take credit for the discovery. I think it was a post by Jerry RxMan that pointed me towards the CB650 sprockets. As for the master link, I noticed most chains were the rivet type as well. I just ordered extra rivet links and bought the riveting tool just in case I wanted to remove the chain without having to remove the swingarm. The tire/wheel can still be removed while leaving the riveted chain intact so I'm good with it.

Tintop · « **Reply #1273 on:** June 04, 2018, 07:18:37 PM »

Most clip type 530's are for 'O'ring type chains. A quick Ebay search also showed some for non o-ring chains.

SKTP · « **Reply #1274 on:** June 04, 2018, 07:21:33 PM »

I bought the fancy DID X-ring...Can't find anything...I guess it will be the Rivit type

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Author Topic: 1978 CB750K — Post 836 OIL PRESSURE - Hopefully Good!? (Read 251771 times)