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 Post subject: 1976 Engine Rebuild
Share Post: Share on FacebookShare on TwitterShare on TumblrShare on Google+Share on MySpace  Post Number:#1  Unread postPosted: December 8th, 2015, 5:10 am

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Ok so I have begun my engine rebuild, which I mainly think is only going to consist of re-ringing the motor. I believe that all of the bearings and such will be fine. So instead of just pulling the engine I am reworking components as I need to remove them. First I removed the carb rack so I could replace all the buttons with the black delron as I have in other mods that I have shared on the forum. I also removed all the lettering from the caps so they look super badass now, Ill post some picks later.

Next I began to remove the heads so I could take them all apart, clean the valves, and machine or lap them as necessary. So far the lapping is working just fine. Now, here comes the question, upon inspecting the cam lobes for wear I discovered something that you may or may not be aware of. In the Clymer manual, which is what I have, it shows that the specs for both the intake lobes and the exhaust lobes are the same for years 75-77 and different for years 78-79. However when I check the Honda manual via the forum it shows that they are different and gives no discrepancy between model years.

Here is what my cams measure:
Intake 1.460 on all 4 lobes. The book shows a size range of 1.459-1.465 with a service limit of 1.448 so all good there...
Exhaust is 1.440 on all 4 lobes. This is where I get confused a little bit. Here is why....

The Clymer manual shows a size of 1.459-1.465 with a service limit of 1.448 for years 75-77 and sizes of 1.445-1.451 with a service limit of 1.437 for years 78-79. So when I measured my exhaust lobes I'm sayin to myself "man those lobes are nearly .020 below factory and .008 below the service limit". Then I went to the forum and checked the Honda manual which shows sizes of 1.445-1.451 with a service limit of 1.437 with no difference between model years.

The bottom line is I believe, according to the Honda manual, that my cams are indeed just fine. So, does anyone have sizes on thier cams that I can compare to? Is this hickup in the Clymer manual well documented like the jet mixup they have published?

It seems as though I should really ditch this Clymer manual and invest in a Honda manual. I'm just looking for some affirmation that my cams are indeed fine and are actually within spec.

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If you go fast enough, your never in one place long enough to get hurt....
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 Post subject: Re: 1976 Engine Rebuild
Share Post: Share on FacebookShare on TwitterShare on TumblrShare on Google+Share on MySpace  Post Number:#2  Unread postPosted: December 8th, 2015, 5:16 am

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I should also note that there is absolutely nothing to indicate major amounts of wear on these cams. All the lobes look to be in really nice condition with no burrs, galding, or scratches. The rockers are also nice and smooth with no burrs are scarring. It didnt make any sense to me that the Intakes would be perfect and all 4 exhaust lobes would be worn nearly .020 and all within .002 of one another.

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If you go fast enough, your never in one place long enough to get hurt....
It's not the top end that I find exciting. It's as the exhilaration of acceleration!!!
Motorcycles, tattoos, and beer once you have one you'll only want another...


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 Post subject: Re: 1976 Engine Rebuild
Share Post: Share on FacebookShare on TwitterShare on TumblrShare on Google+Share on MySpace  Post Number:#3  Unread postPosted: December 8th, 2015, 5:18 am

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...im sure the cams are fine ....sounds like neat project :popcorn:

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 Post subject: Re: 1976 Engine Rebuild
Share Post: Share on FacebookShare on TwitterShare on TumblrShare on Google+Share on MySpace  Post Number:#4  Unread postPosted: December 8th, 2015, 5:32 am

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Yea Joe its gonna be fun...2 years ago I was learning how to remove and clean a carburetor, this year Im gonna get into the internals of the engine. I never would have thought it, but here I am. I will be sharing progress along the way. Im hoping for a significant boost in my compression. The bike runs great for as low as it is so I cant imagine what bringing it back to spec will do.

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My YouTube channel: https://www.youtube.com/channel/UC2W2lQ ... j4cHvQqdWg

If you go fast enough, your never in one place long enough to get hurt....
It's not the top end that I find exciting. It's as the exhilaration of acceleration!!!
Motorcycles, tattoos, and beer once you have one you'll only want another...


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 Post subject: Re: 1976 Engine Rebuild
Share Post: Share on FacebookShare on TwitterShare on TumblrShare on Google+Share on MySpace  Post Number:#5  Unread postPosted: December 8th, 2015, 8:28 am

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Curious question:

Why do you need a overhaul or rering?

Low compression?
Burning oil excessively?
Ultra high mileage and just tired and worn out?

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 Post subject: Re: 1976 Engine Rebuild
Share Post: Share on FacebookShare on TwitterShare on TumblrShare on Google+Share on MySpace  Post Number:#6  Unread postPosted: December 8th, 2015, 8:54 am

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84 Aspencade -- "The Escalade"

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Low compression.

My compression readings are around 90psi per cylinder. The bike runs surprisingly well but I have oil blowing by and coming out the exhaust because the rings are stuck I believe.

Here is a video of it when I finished my winter projects last season. I did tires, brakes, and a custom exhaust job.

https://www.youtube.com/watch?v=AFZKDU4LT58

phpBB [video]

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My YouTube channel: https://www.youtube.com/channel/UC2W2lQ ... j4cHvQqdWg

If you go fast enough, your never in one place long enough to get hurt....
It's not the top end that I find exciting. It's as the exhilaration of acceleration!!!
Motorcycles, tattoos, and beer once you have one you'll only want another...


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 Post subject: Re: 1976 Engine Rebuild
Share Post: Share on FacebookShare on TwitterShare on TumblrShare on Google+Share on MySpace  Post Number:#7  Unread postPosted: December 8th, 2015, 9:11 am

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yep runs good for 90 lbs compression ....sheesh i guess the c5 is making the best of it ...how do plugs look bronko ...like to see pic of that .... :popcorn:

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 Post subject: Re: 1976 Engine Rebuild
Share Post: Share on FacebookShare on TwitterShare on TumblrShare on Google+Share on MySpace  Post Number:#8  Unread postPosted: December 8th, 2015, 9:13 am

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I see,
90 psi is low now it makes sense.
Running surprisingly well makes less sense, but hey it's a Honda.

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 Post subject: Re: 1976 Engine Rebuild
Share Post: Share on FacebookShare on TwitterShare on TumblrShare on Google+Share on MySpace  Post Number:#9  Unread postPosted: December 8th, 2015, 9:54 am

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84 Aspencade -- "The Escalade"

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yep runs good for 90 lbs compression ....sheesh i guess the c5 is making the best of it ...how do plugs look bronko ...like to see pic of that .... :popcorn:


Plugs range from coffee color to carbon n oil black. Ill try n post a picture of them later when I get home. I also cant wait to see what this c5 does with a proper engine.

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My YouTube channel: https://www.youtube.com/channel/UC2W2lQ ... j4cHvQqdWg

If you go fast enough, your never in one place long enough to get hurt....
It's not the top end that I find exciting. It's as the exhilaration of acceleration!!!
Motorcycles, tattoos, and beer once you have one you'll only want another...


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 Post subject: Re: 1976 Engine Rebuild
Share Post: Share on FacebookShare on TwitterShare on TumblrShare on Google+Share on MySpace  Post Number:#10  Unread postPosted: December 8th, 2015, 2:06 pm

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84 Aspencade -- "The Escalade"

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Here are some pictures of the plugs. There is also a pic of one of the cylinders. They all look really good from top to bottom. I just think the rings are stuck. Ridding the shit out of it didn't fix it so im aiming to get her back to the original glory, probably better. My compression is only 90psi per cylinder. Runs great but I gotta be losing out on a good helping od power i would think.

Let me know what you guys think...
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My YouTube channel: https://www.youtube.com/channel/UC2W2lQ ... j4cHvQqdWg

If you go fast enough, your never in one place long enough to get hurt....
It's not the top end that I find exciting. It's as the exhilaration of acceleration!!!
Motorcycles, tattoos, and beer once you have one you'll only want another...


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 Post subject: Re: 1976 Engine Rebuild
Share Post: Share on FacebookShare on TwitterShare on TumblrShare on Google+Share on MySpace  Post Number:#11  Unread postPosted: December 8th, 2015, 2:09 pm

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I see,
90 psi is low now it makes sense.
Running surprisingly well makes less sense, but hey it's a Honda.


I was sure I was wrong and it would be ok but nay. One time I got a cylinder to read 140psi but the next day it was 90psi. It's like it broke free, just a little, and when it cooled it locked up again. I was sure I was doing the test wrong but all signs point to low compression and sticky rings...no matter how i do the test or what tester I use. Im thinking a 60-80 pound boost in compression should be quite noticeable :music:

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My YouTube channel: https://www.youtube.com/channel/UC2W2lQ ... j4cHvQqdWg

If you go fast enough, your never in one place long enough to get hurt....
It's not the top end that I find exciting. It's as the exhilaration of acceleration!!!
Motorcycles, tattoos, and beer once you have one you'll only want another...


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 Post subject: Re: 1976 Engine Rebuild
Share Post: Share on FacebookShare on TwitterShare on TumblrShare on Google+Share on MySpace  Post Number:#12  Unread postPosted: December 8th, 2015, 2:16 pm

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How many miles at a time and total did you ride it? What did you add to the oil during that time? Did you use ATF in the fuel during that time? Did compression go up significantly when oil was put in the plug hole? Cylinder walls look great! Might be just a bit of clear glaze present but hard to tell in the pic.

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 Post subject: Re: 1976 Engine Rebuild
Share Post: Share on FacebookShare on TwitterShare on TumblrShare on Google+Share on MySpace  Post Number:#13  Unread postPosted: December 8th, 2015, 3:04 pm

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84 Aspencade -- "The Escalade"

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How many miles at a time and total did you ride it? What did you add to the oil during that time? Did you use ATF in the fuel during that time? Did compression go up significantly when oil was put in the plug hole? Cylinder walls look great! Might be just a bit of clear glaze present but hard to tell in the pic.


I rode it on short rides, 10 - 25 miles at a time. I took it on a few rides where I went 80+ miles round trip. I would ride it every day to work when the weather permitted. I probably put about 3,000 miles on it over the season. I've used MMO and atf as fuel additives, not at the same time of course....I never added atf to the engine oil in any significant amount, but have changed the oil a few times. When I did the compression tests i never added fluid to the cylinders and rechecked...rookie move, im still learnin...however, I have had the heads apart before and they appear to be in great shape. I've done leak downs throught the intake and exhaust ports and got no leaks. Everything seals up tight. Also, while I have the bike comming apart i am lapping the valves in and going through them, leaving no stone unturned...

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My YouTube channel: https://www.youtube.com/channel/UC2W2lQ ... j4cHvQqdWg

If you go fast enough, your never in one place long enough to get hurt....
It's not the top end that I find exciting. It's as the exhilaration of acceleration!!!
Motorcycles, tattoos, and beer once you have one you'll only want another...


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 Post subject: Re: 1976 Engine Rebuild
Share Post: Share on FacebookShare on TwitterShare on TumblrShare on Google+Share on MySpace  Post Number:#14  Unread postPosted: December 8th, 2015, 3:07 pm

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Plugs & bore look good from here! :popcorn:

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 Post subject: Re: 1976 Engine Rebuild
Share Post: Share on FacebookShare on TwitterShare on TumblrShare on Google+Share on MySpace  Post Number:#15  Unread postPosted: December 8th, 2015, 3:20 pm

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Had you asked before tearing into it I would have advised a few all day rides. Including some intermittent high rpm runs with 8oz of atf in the oil. That alone may have cured the issues. Unsticking and reseating the rings and bringing compression up to normal. Stuck rings need time at operating temperature to break loose.

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Maturity like wisdom seldom arrives without age. Far too often though age arrives without either.
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Politicians are like diapers. They need changed often. For the same reason.
A fine is tax you pay for doing wrong. A tax is fine you pay for doing well.
Second place makes you first loser.


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