Topic: CB750 K6? Is that good? Where do I start?

[saw750]

I finally had a chance to run the VINs on my barn find and it lookls to be a 1976 CB750 K6 7,000 miles- it was complete and original until that side cover was dstroyed : (

but on the bight side the remainder of the bike is all there - including green guages, seat etc.etc

so where do i go from here?? first obviously is a good wash clean off the the dirt and birdcrp

but whats next??? the thing has sat since 1981 - it does have compression..is there anything specificlly i need to watch or check?

all my experience is with rebuilding or working with a runner (british twins) - obviously i will need to change the fluids, filters etc etc. the carb rubbers appear good. need to clean out the tail pipes and search for rodents but what then???

is there a specific procedure i should follow for  "i've been sitting in a barn for 29 years" CB750K6

(yeah i am new here..lol)

thanks saw750
(yes i will post picks after this weekend)

[bistromath]

Get the mice out of the airbox. Rebuild the front brake caliper and at least check the master cylinder. Drop the oil pan and investigate for chunks of aluminum, rodents, etc. New tires -- don't even think about running around on the original rubber. Check the swingarm bushings for play and check the wheel bearings for smooth running. Do a general tune-up including cam chain, valves, and timing.

And then let 'er rip!

[Old Scrambler]

With so few miles............I would not be alarmed about bushings and bearings just yet. Yes, get some new tubes and tires before running at speed. Start with the fluids, including the forks. Install a new sealed battery. Check for lights and horn. Do not turn the motor over with the electric starter. After the aircleaner is checked (install new filter) and the pipes are cleared of rodent storage, I like to drain the oil and remove the filter.....put in a 1/2 qt........to flush remainer.........with the kill-switch on OFF.....run the starter for a few seconds to get the oil circulated......then drain completely. remove the carbs and take them to a shop to have them sonic cleaned with the bowls open......nothing else. Flush the fuel lines and clean the tank/petcock. Add a little fuel and check for leaks.  Install the carbs and button it up.  Now do the valves and camchain adjustments. Then the electrics. If the points are pitted...replace.

Check for fuel in the carbs by opening the bowl drains. Check for spark with a spare plug. Start the motor but don't drive away until you know if the brakes work.  With so few miles, the motor was typically in a good state of tune so very few, if any, adjustments may be necessary.  Lube the cables including the speedo and tach. After the bike is running and road-worthy, I would add 2-oz. of injector cleaner to a fresh tank of fuel and go for a long ride. Then top-off the tank and ride regularly for a few days to get everything clean inside. After a few hundred miles, change the oil and note if it used any. Sometimes it takes a few miles to get the rings to seal again.

Great Find...........Have Fun

[jeez]

In my barn find (11 years in the barn) all of the brake fluid had crystallized.  New brake hoses, lines, and master cylinder are in order along with a rebuild of the calipers.  Check your brakes before going anywhere!

[ekpent]

Follow Scramblers post---all good stuff. Don't be in a big hurry.

[BeSeeingYou]

Mine sat for 25 years with 6800 on it.  Yeah the brake fluid is probably gelled and the brake lines plugged.  I used a 1/16 inch braided wire to clear them and they should be okay for temporary use but best to replace before any serious driving.  Just go ahead and get rebuild kits for the caliper and MC.  Pull the gas tank as most likely needs cleaning of varnish, gunk, and corrosion and the petcock too.  Plenty of info on that here.  Before you turn it over pull the plugs and get some lube into the cylinders and then kick it over with the kick starter with the plugs OUT.  Be careful removing and replacing the inner two especially screwing them back in, don't force it.  You can't see what you are doing on those two.  Check the position of the petcock.  If "on" you may have a bit of a mess in the carbs.  Mine was stored with it off and gas in the tank but my carbs were clean and just required a bowl removal and quick clean in place. Contrary to popular opinion they do not always require removal and complete disassembly.  Sometimes you get lucky.  I am of the opinion that because so many have gone through this troublesome procedure they want all of us to go through it as a "right of passage".  Check over the exposed or accessible wiring for mice damage.  When I changed the oil for the first start up I used a mustard squirt bottle to dump some of the oil in through the tappet covers to get some lube into the top end along with a new filter.  Mine smoked a bit for the first couple of days and then it cleared up.  I found my timing to be spot on but it should be checked. I just cleaned the points.  Still running the original swingarm bushings and chain though my chain was well lubed and not corroded.