Cafe Racer Forum banner
1 - 20 of 111 Posts

·
Registered
1982 kz440a
Joined
·
89 Posts
Discussion Starter · #1 ·
I sold the 440 and picked up a 750 over the weekend. Really didn't want another LTD, but this one was too clean to pass up for $800. She has 9,000 miles and the intake and exhaust haven't been molested.
Wheel Tire Land vehicle Vehicle Fuel tank

Guy threw in a carb rebuild kit that he never got around to using, an extra full exhaust and some other bits. I overhauled the carbs last night. I got enough practice with he keihin cv36's that made setting the floats on this a breeze. The fact that I can tip them 15 degrees and eyeball them and have them be dead on when confirmed by floatdrop is very rewarding. I learned stuff....

Hey, does anyone have a tip for fixing a drain screw that looks like this:
Body jewelry Finger Thumb Wood Jewellery


Can I file it down to a nice point and hope it seals? Or will removing more material make it worse?
 

·
Registered
1982 kz440a
Joined
·
89 Posts
Discussion Starter · #2 ·
Oh, that last attachment was an accident (that was from when I was taking the 440 to its new owner) you know I hated that grand caravan when we got it, but Its growing on me
 

·
Registered
1982 kz440a
Joined
·
89 Posts
Discussion Starter · #4 ·
Everything is there. I replaced the o-rings on all of them, but the o-rings don't actually close the drain, they just prevent gas from leaking out the drain screw. It is the pointed tip on the screw that closes the drain (which doubles as an overflown on kehins) and as pictured, the tip is worn off
 

·
Registered
1982 kz440a
Joined
·
89 Posts
Discussion Starter · #5 ·
Is that a pcv valve on this bitch?i
Hood Automotive lighting Automotive tire Bumper Automotive exterior
I was all excited cause I thought I'd finally find out what a factory intake ran like.... I'm missing the fucking crankcase vent hose! Now I gotta find one with this od: NJ
Automotive tire Bumper Motor vehicle Automotive exhaust Fender
and this id:
Hood Automotive fuel system Motor vehicle Automotive tire Vehicle
fuck my life
 

·
Registered
Joined
·
7,508 Posts
Still better off then the previous one. First thing you should be searching for is a shop and owner manual, that will tell you all about what emission shite it had on it.
 

·
Registered
1982 kz440a
Joined
·
89 Posts
Discussion Starter · #8 ·
I fixed the drain screws that wouldn't seal by chucking them in a drill and spinning them on a file:
Microphone Yellow Wood Gas Tints and shades
since the timing advancer on the 440 was seized when I got it, I was eager to grease the one on the new bike. Look how fucking clean the 42 year old assembly was when I popped the cover
Tire Wheel Automotive tire Locking hubs Vehicle brake

I'm keeping this bike.
 

·
Registered
1982 kz440a
Joined
·
89 Posts
Discussion Starter · #9 ·
Ok. I took my first ride today and I am completely underwhelmed with the bike's ability to take off. Its running perfectly, but the gearing feels like it was set up for low rpm freeway cruising. The 440 was much more fun to drive around town. The stock setup is 13/32 (630 chain)

I'd like to change the rear to about 36 teeth (correct me if I'm wrong, this will limit top speed to around 110mph)

If I do this I will probably need a longer chain too. Should I just replace it all and go to a 530 setup? Forgive my ignorance, I've never had a 5speed before and never experienced such an unsatisfactory first gear... by the time the PowerBand kicks in I'm already at 30mph in first gear. That's not very useful to me in the city...
 

·
Registered
Joined
·
2,712 Posts
Just double checking....
Carbs balanced?
Carbs thoroughly cleaned? (I prefer ultrasonic)
Bike running on all cylinders?
Clean air filter?
Carb boots in good condition?
New, properly gapped plugs?
Check for proper voltage at coils
Check valve shims
Timing checked with timing light?

Don't write it off until you go through all those things first.
 

·
Registered
1982 kz440a
Joined
·
89 Posts
Discussion Starter · #11 ·
The only thing on your list i have not done is ultrasonic cleaning and timing light (because I don't have those. I verified that the advancer is is visually opening as is should under throttle and I assured that every passage (even the commonly forgotten 3 holes for the pilot are unobstructed using a guitar string, solvent, compressed air....
 

·
Registered
Joined
·
7,508 Posts
... by the time the PowerBand kicks in ...
Something is wrong, a 4-cylinder 750cc engine doesn't have a narrow power band that kicks in anywhere. I would question if your engine is running on all cylinders. Compression test would be in order and verify that all 4 cylinders are getting hot.
You can't fix poor performance by gearing it lower.
 

·
Registered
1982 kz440a
Joined
·
89 Posts
Discussion Starter · #13 ·
Something is wrong, a 4-cylinder 750cc engine doesn't have a narrow power band that kicks in anywhere. I would question if your engine is running on all cylinders. Compression test would be in order and verify that all 4 cylinders are getting hot.
You can't fix poor performance by gearing it lower.
You were right. Only 3 of the manifolds were warm. I rode it to the dmv for a VIN inspection. Will investigate further after work.
 

·
Registered
Joined
·
7,508 Posts
So it's basically working at half power and maximum fuel consumption. (y) On the up side there is tons of room for improvement. Your avatar makes me want to have a beer and I rarely even drink the stuff, you're a bad influence on me :LOL:
 

·
Registered
1982 kz440a
Joined
·
89 Posts
Discussion Starter · #15 ·
So it's basically working at half power and maximum fuel consumption. (y) On the up side there is tons of room for improvement. Your avatar makes me want to have a beer and I rarely even drink the stuff, you're a bad influence on me :LOL:
My wife told me I could buy as many bikes as I want if I don't start drinking again. Haven't had one since Christmas. This summer is gonna be awesome
 

·
Registered
1982 kz440a
Joined
·
89 Posts
Discussion Starter · #16 ·
Ohhhh boo! Compression is very poor. Either the cheap guage from Amazon is not reading properly or I'm way out of spec. The 3 that are firing read around 100psi and the one thats not is reading 75.
 

·
Registered
1982 kz440a
Joined
·
89 Posts
Discussion Starter · #18 ·
Ok, cleaned the plugs the one that wasn't firing was fouled. (This happened before I rebuilt the carbs and set the floats) took it around the block, its a whole different bike now. I'm not gonna worry about compression till I put a different tester on it
 

·
Registered
Joined
·
7,508 Posts
You could check your valve clearances and see if that one lazy cylinder is way off adjust compared to the rest, but significant lower pressure on one cylinder is often a sign of a more serious problem inside that lung.
 

·
Registered
Joined
·
174 Posts
Carry out another compression test, note the results.
Then Carry out the test again but squirt a small amount of oil through each plig hole first.

If the compression jumps up, its your rings, if they remain low you are losing compression through your valves (either past the seats or valve gaps too tight).
 
1 - 20 of 111 Posts
Top