Well,from what I gather from Outobie's posts back when I first joined HT the CB350K3(usually 1971'?)was the model/year for many improvements in the engine.
What else changed/improved other than oil pump and skinny cam?
I don't know,but interested to find out.
Thanks Boomer, that's the next step. Also will blow the cross drilling to both studs and probably put the NOS pump in.
Increased oil flow in later engines is mentioned in the CB350 service bulletins #23 and #25 from 1971 and 72.
Great find. I think I should pull left side cover to check gaskets too, although this motor only has 25 miles on it. So, K0- K2 CB/CL must have the small bore pump.
This K0 has the off/L/H switch too. Not sure if that is what you mean.
Right. John did change several things, including the stator, I'm pretty sure. It's interesting to me to try to reverse comprehend the why and wherefore of these things.
It's very interesting to hear how you've improved the efficiency of both the charging and lubrication systems on these old bikes.
Yes, I bought it last year in September from John (outobie at HT). This is the only thread I've started but it may be in the 'Bikes for sale' where everyone here goaded me into the purchase. Reasoning was pretty simple: A. It was close enough to me, and B. It was a good deal. John had lowered his ask at least a couple times but, surprisingly, had no interested parties. I really enjoyed chatting with him for a couple hours about it and 350's in general when I showed up with my trailer. Haggling consisted of both of us agreeing that it was worth way more, but he was content to pass it to me for little more than what he had in the paint job. I think it pleased him to finish off his vintage 350 builder phase in an enjoyable way. He said he had already sold off a large inventory (a box truck full) of his 350 stuff, and this bike, that was to be his keeper was the very last of all that. He just wanted to clear the deck, literally, as he spends most of his time restoring a vintage cruiser type boat for his family. He still has a couple bikes, both 400's, one for the street and one for his continued amateur racing interest. I'd love to meet up with him this summer when goes to the track, just to watch and learn.
And @outobie here too, though he hasn't been here since late last September.
Do it here first to try to entice him to come back now and then
That's right! I will for sure. I better go punch in at my garage, I'm late as usual.And @outobie here too, though he hasn't been here since late last September.
Do it here first to try to entice him to come back now and then
I was at the old place for just a few months when I was putting my Benly together but do remember Tools and others. It was Ancientdad who greeted me there and here too. I barely remember Outobie, as he was a 350 guy and I hadn't realized my longing for 350's .....yet, and so I spent most time on the FB Benly groups and it was great back then, but they waned and VHT waxed greater. I'm staying put for sure right here.Great back story BB as I was a member on the old forum a number of years ago before Vertiscope got seriously involved and not overly active. I did do a lot of carb rebuilds/cleanings for members for awhile over there. Yet I don't remember John or outobie. I do remember a number of the members who are now the administrators here, or others. What happened to "TOOLS"? He was a knowledgeable member and big time poster I recall.
I had a brand new 1968? CB350K0 back in the day that was the green colour and white. I had it for about a year, as I changed bikes pretty often back then. A number of BB's and a Hellcat and eventually an early 70's CB750 SOHC. Then retirement from riding for a long time.
So it brings back some memories with those knee pads and the 10K redline IIRC. It saw that on a regular basis.
The 350 is fun to take out because of the number of folks that have some memory about it. Great deal of nostalgia involved. They had one. A friend had one. Or a father or uncle. It was their first bike. Gave girls rides on them. You name it.I had a brand new 1968? CB350K0 back in the day that was the green colour and white. I had it for about a year, as I changed bikes pretty often back then. A number of BB's and a Hellcat and eventually an early 70's CB750 SOHC. Then retirement from riding for a long time.
So it brings back some memories with those knee pads and the 10K redline IIRC. It saw that on a regular basis.
Your CB350K0 fully restored machine is looking very good.Bit by bit looking into this motor.
Drained the cloudy 8 year old oil and found a lump of possible sealant on the plug magnet. Somewhere between 25 and 150 miles on this oil, I'd expect. Not sure if John (outobie) did a first start oil change or not.
Next was to pull the right cover and check the oil filter which did have a damaged Oring on the filter lid. I had previously cleaned the cup and blew air through the cover channels, just forgot about that Oring. I guess that could cause a drop in oil flow. There seemed to be concern on John's part about oil flow, mainly a missing sealing rubber ball and an older style smaller pump piston.
The pump has an aluminum body and so must be the later 19mm larger pump. There is no locking bolt tab strip on it.
I think John did not put this side of the motor together, besides, he would know for sure if the sealing ball was in place.
The obligatory dental probe shot showing the ball is in there. I could feel it's spherical shape as well.
Looking around, I can see the 0.25 stamp on the piston domes through the spark plug hole and fresh cross hatching on the cylinder walls.
Also the exhaust ports are very smooth showing it has been worked there. Very faint rust on the valve says they are probably not stainless or titanium.
The intake ports look very opened and smoothed with a center rib (to promote swirling, I've heard). There looks to be smooth reaming from the edge of the seats into the ports. Were new seats or fresh cuts involved? I'm not familiar enough to guess if the valves have been oversized or are stock but overall it shows much work has been done to this head to maximize breathing.
I'll pull the left side cover and see what's up, also blow through the main oil channel for grins.
I do know it's got great compression (180 in both) and good oiling up to the cam box so I'm running out of ideas to find 'the smoking gun' for John's concern that something just isn't right. He spoke of a possible missing ball and older 14mm oil pump only because he did not do that work, I guess.
I'm scratching my noggin for further investigation of potential problems. Any ideas?
It is impossible to know the oiling status of the bottom end/ rod big ends/ rod small ends/ cylinder walls/ rings etc. without a total disassembly but that does seem unlikely.
I better get the carbs done and prepare for a start up.
He probably is and we may be too. Maybe he was just making a general disclaimer in case anything went awry.
With my and Joyce's health situation, it's almost impossible to say.
That's very generous of you Damien. OEM floats should contain genuine Japanese air, as well.
You make me laugh out loud. "Japanese air" and "swingers party parts wise"That's very generous of you Damien. OEM floats should contain genuine Japanese air, as well.
Remember you supplied the carb body for the set that is on my Mousetown build, which I still need to tune out the burbling stumble between 2-4K rpm.
There is no rush because I borrowed the 722A carbs from another future project (A Mom's bike: 72 CB350). Both sets had 1 leaker so I've got an intact pair to proceed with. I'll also use one of the bowls so I can use my clear tube level checker with the proper 6x .75mm thread.
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The Mom's bike carbs will need some work anyway, with a broke choke flapper spring (ugh) and an order for Scrambler Cyle parts new chrome tops, 2 kits (to get new 68 jets, in the 3D kits) and, what the heck, 2 more floats filled with unspecified Asian air. Maybe an extra petcock too.
Hopefully, I can re-use the diaphragms without risking any transmissible carburetor diseases. With all these 350's around here, it's like a 'swingers party' parts wise.
I'm sure that would be very handy. I just have my numbered drill bit set and a handful of guitar strings ends which I check with my micrometer. I was surprised to be able to actually see the difference between a 68 and a 70 jet hole with a white background and a decent magnifiying glass. There is some variation in different aftermarket jets. I've found quite a bit of differences in the cross hole drillings in the idle jets and emulsion tubes.
Wow. Mid 60's at night and mid 80's daytime here. At 104, I'd lose a slug race.
The carbs look to have cleaned-up decentlyThe carbs are cleaned and back together. The nice viton preformed bowl gaskets from Sirrius Consolidated were still a little small and required being glued into the bowl channel. Instead of the my old can of Titebond Aviator type non-hardening gasket dressing, I decided to use this Permatex similar version. I don't really recommend it, if you're short on patience like me, as is takes forever to get the least bit tacky. I only waited a day before just slipping on the bowls and hoping I didn't pinch the Oring. I believe they are on ok but next time I'm going to use a tiny bead of fast set contact cement.
The jetting is the way I got it from Outobie, with a 70 primary jet (not the one the needle goes through) and a 35 for idle jet. Air screws were previously at 5/8th of a turn, as were other carbs being cleaned. It makes no sense to me to call this the primary and the one with the needle the secondary. Perhaps there is logic having to do with the order of function during acceleration.
I removed the left engine side cover and blew out the main transverse oil channel, which I new was clear but now cofirmed and clean.
I will remove the entire clutch and oil pump to inspect the shifter mechanism just to be sure it all looks good.
The valves were a little tight (new engine break in, not surprising) and the cam chain didn't budge when retensioned as per the book.
Not much left to explore, looking for reasons why Outobie sidelined this bike 9 years ago. Time to put on the carbs, new battery, petcock, etc. and yell, "Fire in the hole".
your a Blessed man.
Thanks Bill. Hard to believe a whole year slipped by.The carbs look to have cleaned-up decently
I look forward to you putting the key into the ign. switch and 'fire that mutha' Up' !
Then you can check that 'check bolt' for oil flow on the cyl. head and feel satisfied to take it for a ride;getting the opportunity to do these things from 'above ground'
I hope you can have a person in town take a picture of you sitting on that bike
Charles may come back and get a chance to ride his black CA77 around a bit.
Yeah, both Dreams need charged up and shake the cobwebs off.
