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Discussion Starter #1 (Edited)
scud's CB450 - A 71' Vintage Red

I've really wanted a 450 for some time...and now I finally have one! There was recent maintenance done and some top end work. Everything seems to be in good condition. I've taken it out for a couple spins and it feels solid. The PO used it as a daily rider for the most part...so it appears to have been fairly well taken care of.

The plan is to ride it and enjoy it for the time being...no immediate work in the near future. Later on down the rode, I'll pull it apart and clean it up nice...so I'll start a project log now...even though I probably won't update it for months...because I'll be riding :D

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Scub, your ride seems to be in excellent shape. Is it a '71 or a 72? I noticed that the fork gaiters are torn. I have the same issue with my CB450.

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"Later on down the rode, I'll pull it apart and clean it up nice"?????

It looks great as it is, makes mine look like a turd!


In other words, very beautiful bike, the same with uday19475's bike
 
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Gorgeous bike! Congratulations!
 
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Nice score,scud. Enjoy. (while most of the rest of us are just staying warm........LOL).
 
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Discussion Starter #9
Scub, your ride seems to be in excellent shape. Is it a '71 or a 72? I noticed that the fork gaiters are torn. I have the same issue with my CB450.
The title says 72, but it could be one of those bikes that was manufactured in 71 but didn't actually get on the books until 72...but not sure...

The PO had gaiters, fork seals, and an All Balls steering neck bearing kit that came with the sale. I'll just need to replace that stuff later on. The rubber on the gaiters seem to vary in quality dependent upon manufacturerer. Some just can hold up to the force of the wind while riding...plus they get brittle in the sun/heat.
 

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Nice bike. It looks like a K3 or K4 bike. That would make it 70 or 71 model. The difference is the forks, front brake, head light size and painted headlight & ears. Some one else may chime in. What it the VIN? It will make a difference on any part orders. Love those 450 DOHC bikes.
 

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Discussion Starter #12
Nice bike. It looks like a K3 or K4 bike. That would make it 70 or 71 model. The difference is the forks, front brake, head light size and painted headlight & ears. Some one else may chime in. What it the VIN? It will make a difference on any part orders. Love those 450 DOHC bikes.
seems like it's a K4 then, VIN starts with CB450411xxxx. which would make it a 71 with it first being on the books in 72
 

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Nice!


Dan

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Discussion Starter #16
Ran into some trouble today. Probably just an indicator that I really need to look deeper into this new bike. Bike had a slight oil leak on the left side at the lower case when I bought it...figured I'd get to it later. On a ride today...I stopped and oil was pouring out the left side. I think it only subsided because the bike ran out of oil. This ride was my first sustained 70mph+ ride on the bike. The oil leak had me concerned, but I had to get home (Thanksgiving). Through in a quart of 10w30 (problem? case calls for 10w40). Starting riding. Engine was robbed or performance...I actually started to notice this before the leak. Bike was struggling at 70mph. Then the oil blew. Spray out of the motor, all over the left side of the bike and I lost all power...pulled over. Hard to tell where the oil came from...will need to pull things off the bike to investigate. During a little reading tonight...seems like a "holed" piston or broken rings....oil collecting in the head or too much oil in the case. I having a feeling the last two options are the least likely. Upon initial roadside inspection...I'm thinking the oil spray/pissed out the breather...weird
 

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Hi Scud,

Sorry to hear, but it seems you have to open up this one too.
Can you place some pictures of the left side ? Where did the oil come from ?

You can use a 10W30 in the bike, no worries, that's not the start point of this failure.

Did you do a check-up before riding ? (points, timing, valve clearance, cam-check etc) ?
If timing was off at 70mph (too much advance), it's not unlikely that a holed piston is the result of that.
When you have much blow-by due to piston ring issue's or/and holed piston, oil will come out of the breather tube.

In general, before I trust my life to a bike I bought from someone else, I completely disassemble it (including engine).
Trust me, I learned the hard way :(

Jensen
 

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Sorry to hear about the issues. Thats a great looking bike. I'm working on a 72 CB450 myself. Mine has chrome ears and a black painted headlamp bucket. Not sure if thats stock or not. Wish the paint looked as nice as yours. I'm sure you'll sort out the oil issue. I'm convinced that the answer to any question is here on Hondatwins somewhere.
 

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Discussion Starter #19
Thanks Jensen and Iamthebatman.

I'm not certain where the oil came from, due to it being everywhere. But upon first inspection, looking at the gasket seams, I don't see anything that is blown out. The oil residue on the bike starts high, suggesting that it came from the breather.

Honestly, I did not do a tune-up check on this bike. It seemed to be running well....but obviously, we are here now...so that is the last time I will make that mistake.

Holed piston or broken rings is my suspicion. I plan on doing a compression test next. I'll report back with those numbers.

Either way, the bike now needs to come apart completely and have everything gone over. I guess I was hoping to be a lucky guy...and buy a bike that was in well running condition haha :D
 

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Hi,

Just starting to measure the compression, and go from there.
Sometimes, against all odds, it's something simple, so start with the comp test,

Jensen
 
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