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Hi, I’ve got a 1982 DOHC & I’ve broken down & stripped the carbs. I’m running it with the stock air box & a K&N filter. The jets are 107 & 68, are these the right size or not? The other thing is that in 2 of the carbs the 107/68 jets are switched around! Now, which orifice should they be in ...

Hi people, I’ve broken the bank of carbs down to individual carbs & I’m stripping them now. The jets are numbered 107 & 68 in all 4 carbs. My questions are: is the 107 jet too big? Standard should be 100. Also, in 2 of the carbs the jets are in different positions to the other 2, So which is...

Thanks amc, don’t think I’ll bother with that then. As it happens I’ve bought a nearly new 6ltr ultrasonic cleaner today off eBay (bargain at £48.50) . What do you guys recommend I add to the water in it, to aid carb cleaning? Any advice/experiences? Cheers Windy

Hi all, you guys in the States seem to mention Pine Sol for cleaning carbs, does anyone know what the UK equivalent is please? I’m going to strip mine right down for a proper clean & want to soak each individual carb . Cheers Windy

Hi Chris, my van is a 1972 with a 1275cc engine, Weber carb, cooper s discs, hi lo suspension, straight cut gearbox, big exhaust etc. It’s a full nut & bolt resto!! So I’m trying to get the bike sorted & on the road so I can ride it this summer, then I can concentrate on the van. Lots to do...

amc, yeah I read that & was thinking of bypassing them as suggested in the manual. Seems like an added complication to me! I have a compressor in the garage, so can blow jets out etc. It’s just that an ultrasonic cleaner might get to places that other methods can’t. If I bypass the air cutoffs &...

Thanks amc, you know your stuff don’t you? I was thinking of buying an ultrasonic cleaning machine to do the carb bits in, I’ve also got a Morris Mini van that I’m restoring so I reckon I’ll get some use out of it. Has anyone experience of one of these ? Do I need one with a heater? Thoughts...

Thanks for that matey, I’ll take the bowls off & have a look. Cheers

Thanks dirtdigger, so should I buy a kit without jets then? Just o rings, springs, gaskets etc. Would save me some money. What do you think? Cheers Windy

Thanks guys, that’s what I’ll be doing then. I took AMC’s advice re valve clearances so I’ve downloaded & printed the McGregor guide which is 42 pages of comprehensive info. Guess it’s just a case of being careful & methodical. What size jets do I need for a stock rebuild? ( using the air box...

Hi, I’ve got a 1982 750F DOHC & have just sorted the valve clearances. The bike runs better now but the revs are all over the place & it doesn’t go back to tick over immediately and it’s running rich. I’m presuming the carbs need overhauling. Now, do I have to break them down to individual carbs...

Hi all, thanks for all the replies. Just to let you know I’ve sorted the valve timing out & have 4thou on all 16 valves now!! I did a compression test yesterday & got 135 on all 4 cylinders, before I did the valves #3 was 105 (obviously valves being held open) . Just got the carbs to sort now...

Thanks AMC, I’ve since found out that it’s the inner cable that revolves at 2240 rpm at 60mph. I’ve just bought one that was fitted to a 1980 cb750 & worked ok ( mine is a 1982 F), so we’ll see. Thanks again. Cheers

Now then people, I’m cleaning up the bars on my 750 & want to fit a custom speedo. I’ve seen a few on eBay & some state ‘60mph = 2240 rpm’ They are mechanical & use the speedo cable. My question is, would this be accurate on a 1982 CB750F? Does the motor run at those revs at 60mph, in top gear...

Great advice Wes. You’re right, musical shims is a fun way to while away those long dark evenings!!😖

Ok, I’ve had the shims out relating to the tight valve clearances, measured them & used an online shim calculator & this is what I’ve come up with. Can anyone check these figures for me before I order new shims? This is using .006 thou as the clearance needed. Measured clearance .001 thou...

Thanks amc. When I’ve done the calculations, I’ll post them on here for you to double check before Iborer replacements, if you’ll be so kind? You really have a wealth of knowledge that is astounding!! This is my first foray into a CB750 & this forum is invaluable. Thanks again. Cheers

Thanks Chris, do you measure & calculate clearances/shims in metricvor imperial? Cheers Windy

Thanks guys, the wealth of knowledge on this forum is amazing!! It was only by reading comments on here (mainly from AMC49) that I even thought about valve timing. I made the mistake of blaming the carbs for it running like s**t. Mind you, I’m used to Amal carbs & ohv engines!! Just thinking...

Thanks for the reply. My clearances are as follows:- Inlets 4 4, 4 4, 2 1, 4 4 Exhaust 1 4, 4 4, 4 4, 2 2 All measured in thousandth of an inch. Do I take each one out, calculate what I need then put it back before moving on to the next one? Then order what I need & go back again to fit...

Morning all, I’m in the UK & was wondering where people buy valve shins from, how much they are & which are the common sizes to buy? Cheers people.

Thanks guys, sorry I've not replied earlier but I've been away. Might have to rethink this one. Cheers

Hi, I'm sorting out a 1982 FZ electrics at the moment by junking the original wiring loom & making a simplified one. I want to clean up the handlebars and have come across a switch in the clutch lever housing. Firstly, what is its purpose and can I just disconnect it & get rid without any...

Thanks once again for your reply amc49, appreciate your comments & help. Cheers & stay safe. Windy

Hi, I've just got my 82 FZ up & running but I had to ditch the wiring loom as it had been chopped & ruined over the years. Now I thought I'd clean up the bars & get rid of the OEM switches but this would mean ditching the throttle twistgrip as well. Obviously there are 2 cables, am I right in...

Thanks for that info, great people on this forum.

It's aliiiiiiiive !!! Wired up the stock connectors from pulse generator to spark units & coils, put a feed from the battery through a new blade type fuse box to an ignition switch, fed a switched live back out to the coils and it fired up for the first time in 6 years! Just need to sort the...

Hi, thanks for the reply. Found the components now. I'll try & wire them up tomorrow & let you know how I get on. Cheers

Finally getting round to sorting my 750. The wiring harness is junk, it's been cut, chopped & messed about with so I'm going to start again with a cut down, cleaner look. I saw a bare bones wiring diagram on here by 'losttravlyr' ( are you still on here matey?) which looks great. I just need a...

Thanks for the interest guys, I'll try and get some pictures on here later. Cheers.