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  1. E

    CB750 SUPPLY JULY Giveaway Going on NOW! Enter to win FREE MONEY FOR PARTS....

    Has anyone out there repaired a snapped clutch lifter plate by welding the snapped section off? I have just done this - it seems strong and level but not sure if it will last??
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    Setting tappet clearances SOHC

    You are a star - I ended up setting the tappets like this - the notch ended up being at 6 o'clock - I had exactly the same issue last time I did one - I need to make some notes for myself for the next one. Thanks again
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    Setting tappet clearances SOHC

    Hi, I'm setting the tappet clearances on my K4 750 - I've rebuilt a K1 a couple of years ago and I find I have the same issue I had then - I just can't recall the solution. The manual says to set the no1 cylinder tappets with the slot in the end of the cam shaft at the 12 o'clock position and...
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    Engine bearings Crank and Big End

    Dirtdigger thanks for the reply. Yes the weight of the crankshaft was on the side which is showing the marks. When you say case holes are a little out of shape what do you mean? Also ‘lap the cases’ I know what lapping the valves is but don’t know what lapping the case means. Can you explain...
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    Engine bearings Crank and Big End

    Dirtdigger hi, well where to start - first I had the casing vapour blasted which included glass beads. I thought I had cleaned it out completely - but - on putting the head on I found glass beads in one of the threaded holes. Then I found some more - so stripped the engine completely again as I...
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    Is my barrel a match to my engine?

    Dirtdigger thanks for the reply. I thought it might be an improvement of some kind over the earlier set up. I guess I m going to need an earlier head gasket then as the one I have when I put it on the head seems to have the larger holes to accommodate the dowels and seals. Thanks - you are a...
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    Is my barrel a match to my engine?

    Hi all, I'm rebuilding a K4 engine (whole bike actually) and have split the cases and gone with new shells , pistons etc. I was lining up some 'O' rings I need to order when I noticed on the CMSNI web site that the barrel on the K4 USA version needed 8 'bolt packing pieces' and 8 'special pins'...
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    Torque settings

    Dirtdigger, Thanks for the reply, Yeah I've done a lot of car engines (but this is my first full bike rebuild, only done top end before) and you are right, but 15 ft Ibs does seem very light to me. I remember doing a Nissan 200sx and the torque was something over 200NM. Bigger bolts of course...
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    Torque settings

    My manual says 15ft/lbs so its 'correct' then - I felt this was very low? I guess its ok then. They seemed a lot tighter coming off - the engine has never been stripped down before
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    Torque settings

    Sorry meant to say Conrod
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    Torque settings

    Hi - I feel sure this will have been asked before but here goes - where can I find accurate info on torque settings for rebuilding a CBB750 SOHC - I have a K4 and a K2 in bits at the moment - looking at the manuals I have it says corned bolts at 15 ft pounds but this seems not very high to me -...
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    WANTED - 1971 CB750 K1 left side cover and rear rim.

    I have a rear from a 74 - which needs rechroming if its any use - I can get a few photos of it tomorrow if it helps
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    Engine bearings Crank and Big End

    Thanks again, - im going to bite the bullet and get all new bolts as well - at least I'll know its all good then. Might even be a keeper?
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    Engine bearings Crank and Big End

    Dirtdigger, thanks for the replies. Whats your view on rising the corned bolts and nuts - they are very expensive - the nuts are £10 each! I have read conflicting advice about reusing them - I don't know if they stretch or not - the torque setting seems very small to stretch a bolt? I did a...
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    Engine bearings Crank and Big End

    OK thanks for the heads up. I have only done one cb750 so far - a K1 which was a learning curve for sure. I didn't do the crank on that as it ran and sounded lovely so just stripped the top end and replaced valves etc. The rest of the bike has been gone over of course. I'm more used to cars but...
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    Engine bearings Crank and Big End

    This is where I am so far with the build. Just started really.
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    For Sale - 72 CB 750 box of parts

    You don't have a K1 crank case do you with the engine number on? Long shot! Any pedals? Foot brake, rear brake arm for drum, gear change? cheers
  18. E

    Engine bearings Crank and Big End

    Dirt digger thanks. I have a Haynes manual (which is not much use) and have watched 'Hackaweek' on Youtube at least three times. Im retired so this is just a hobby for me. I thought the bearings looked OK but as its split seemed like the right thing to do to buy new - now I'm not sure - main...
  19. E

    Engine bearings Crank and Big End

    Hi all, I am in the process of rebuilding two CB750's a K1 and a K4, I split the cases yesterday on the K4 having previously removed the head and barrels. The main bearings look like they have some marks See photo below of worst one, and I'm going to change them having gone this far - the big...
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    For Sale - 72 CB 750 box of parts

    What have you got? I need a yoke and a set of forks for a K4 same as K3/K5
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    Spark Plugs gone bad?

    Hi, I don't know if anyone can help with this. I have rebuilt a CB750 K1 and it has new spark plugs NGK bought from a UK parts supplier. The bike has run ok after the rebuild but only in the garage. Took it for a short test ride and it died on me very quickly. I suspected fuel starvation. Did...
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    SOHC timing....please help!!

    Dirtdigger, the valves weren't that bad - I just wanted to replace them as I had the engine stripped - your terminology is different to mine, we often say grinding valves in instead of lapping - but the valve faces in the head were fine. This is not the first head I have had to deal with just...
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    SOHC timing....please help!!

    Yes I ground the valves in myself - the seats were in good order - we call this 'lapping the valves' where I come from
  24. E

    SOHC timing....please help!!

    OK guys thanks for your help - I am a complete numpty!! First bike engine is my excuse. Used to car engines - anyway I had been rotating the engine backwards instead of forwards. so when the inlet valve was closing I had the exhaust opening virtually immediately. As soon as I rotated it the...
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    SOHC timing....please help!!

    But the manual says to do it with the cam at the TDC position doesn't it? I did try it like this and it seems much more like it but I wasn't sure the valves would then close properly. I will have a go again like this - but if you measure on the base circle then the cam is 180 degrees out from...
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    SOHC timing....please help!!

    Valve timing SOHC cb 750 Guys thanks for the reply's - I didn't do any work to the valve seats - they were fine. I have looked at photos I took before I stripped the engine and the adjusters were protruding from the rockers so I know it is wrong - just can't see where. I have the cam in the...
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    SOHC timing....please help!!

    NSXguy7, hi did you resolve this in the end - I have the same issue see my post below. There doesn't seem to be enough space between the rocker adjustment screw and the top of the valve stem??
  28. E

    SOHC timing....please help!!

    SOHC timing - Help please I have the same issue as NSXGUY7 - I have set the cam up twice and it is definitely in the right place - adjusting the rockers on no 1 cylinder is ok (ish) however then cylinders 2 exhaust and 3 inlet and solid - no way to adjust them with no 1 at TDC - which...
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    Tank stripe/decal

    Thanks, mine is a 1970 K1 so would have been painted - I guess this is a pretty skilled job, I don't think I could do this my self. I have heard that clear coat can react with the decals though. I will try some off the tank first to see if I get a reaction thanks for the response
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