I have a real fondness for the CB750. In the late 80's, I was about 6 to 7 years old, and every single morning my father, to warm up his bike, would give me a ride around the block before he went to work. I thought his motorcycle was the coolest thing on earth!
@gregwilson23626 жыл бұрын
Hi Peter, easy way to determine if fuel or electrical is to swap 1 & 4 plug leads around. If the problem follows to No 1, then you know it’s electrical. If problem stays at No 4 you know it’s fuel.
@Mercmad6 жыл бұрын
Honda fours have a sound all of their own and that is a sound I have not heard for 30 years!
@darwindwelle52676 жыл бұрын
Too much fuel in number 4, do you see the rich smoke when you rev it the other ones are clear. To much fuel keeps it cool in that cylinder so check the float height again and check to see that the jets are the right ones. Very nice bike you have there and it brings me back to the days when I I had a few of these.
@charleschidester67676 жыл бұрын
Darwin Dwelle I agree,
@Commander_ZiN6 жыл бұрын
that was what I was thinking the entire video, it's prolly the idle jet he showed at the end like he suspects. I was surprised though the spark plug wasn't black but maybe the fuel is washing it clean.
@JustTex6 жыл бұрын
love the straight pipes. Cheers
@MrG00ny656 жыл бұрын
Great series of videos. Always lovely to see knackered old bikes brought back to life again. Nice one.
@MrButtonpresser6 жыл бұрын
A nice dinner, time to relax! Oh look CB750 Restoration Part 22 time!
@freddykhd6 жыл бұрын
The engine is healthy, the rest is fine tuning. Great job.
@MC-ft8zv6 жыл бұрын
LOVE the sound when you started it...reminds me of a V12 Merlin sound!
@springy-21126 жыл бұрын
So close but you know what you're doing you'll get it sussed 👍👍
@nembrytl10006 жыл бұрын
I concur with Darwin, lots of smoke from no.4 stack indicating excess fuel that's why it's running cooler than 12&3. I had similar issues with my carbureted Honda VTR250 & it was the idle jet.
@jmh87436 жыл бұрын
very good. 95-100% takes lotsa times. comments look helpful. i noticed rich on 4 also.
@MidwestMotoRider6 жыл бұрын
I think you hit on it, I bet it is the Idle jet. GL I am sure you will sort it out alright!
@motorcyclegarage23076 жыл бұрын
oh my that engine sounds incredibly quiet - nice job
@Mentorcase6 жыл бұрын
When I rebuilt my gsx 1100 and first started it it sounded like that, and after a test run it didn't feel right, checked the cam chain and it was out by a bit, once sussed it just rolled over on idle real smooth.
@panelvanman76716 жыл бұрын
AAAAW yes , had a long day , so this will help , thank you as usual peter
@daleyurk43696 жыл бұрын
No worries Peter. You'll figure it out. Did look awfully rich when you raised the RPM's. Fantastic fun!
@bakulaw636 жыл бұрын
Love your videos.Got a 77 P in restauration.Good luck solving the fuel problem.
@Mike_Hoffmann6 жыл бұрын
Well done!
@gosportjamie6 жыл бұрын
I think you're right about that idle jet being the cause if number 4 comes to life when the revs rise. If it was over-fueling due to a too high float level it would be over-fueling across the rev range, not just at idle...
@ianwilson46666 жыл бұрын
So good to hear it run Peter, and a god send here, save me from the blessed football, 350 looks tantalising ..
@kiiiisu6 жыл бұрын
damn it sounds good with those short pipes
@gazza1166 жыл бұрын
sounds fine on rev up so would be checking for vacuum leak ,check vacuum with gauge on all carb manifolds.
@stefanlind796 жыл бұрын
Hi Pete. I´ve just gone through this process with a boredout 500 K1 and I´m using Your vids along with hackaweek to compare what I did sorta right contra screwed up :) Great build amigo!! My carbs where a chapter for the memoryalbums but I got them sorted after alot of headache. I thing 4th is flooding and if I were You I would change the intakeboots just because every other vital thing is touched. Looking for a twin for a new project.
@Andrew.quigley6 жыл бұрын
Still a good result.
@robertthornhill43796 жыл бұрын
peter hi you are a legend 10/10 bob in uk
@mathewjackson83376 жыл бұрын
Hey Peter, don't forget there is a local company that does kits and jets etc for the old bikes. If you need the company name again let me know but well worth a call. Great website too.
@gazoline70936 жыл бұрын
yep definitely a fuel issue my first thought was a stuck open exhaust valve but then I there would have been fire coming out of it.
@MatelotsousMarin6 жыл бұрын
Is the problem not linked to the smoke on number four? Leaky valve stem seal? Hope you solve it soon and looking forward to the 350 videos. These Honda fours are very addictive!!
@nevilleeastough14966 жыл бұрын
When you go to fit the hand grips to the bars i'm told that the easiest and best way to fit them is to spray the bars and inside the grips with women's hair spray Hope this helps you. Regards Neville
@ellesmerewildwood48586 жыл бұрын
At the moment, it sounds a bit like a Spitfire Merlin, :o) Is there no such thing as an electronic points replacement for this ?
@krabkrabkrab6 жыл бұрын
I did not see you adjust the idle mixture screws; the ones that point straight down at the engine side of the carbs. Hard to access with carbs on bike, you need a really short screwdriver. It sounds like #4 is turned too far out. Turn it in by 1/2 turns. Also, do you have a set of vacuum gauges to synchronize? I have the mercury carb stix. Works dandy.
@krabkrabkrab6 жыл бұрын
Also of course way easier if you disable 2&3 first. Tune #4 while it's running. Have to turn the idle up to get it to run on one to two cylinders tho.
@steveearwig6 жыл бұрын
Hi Peter. Can you swap the idle jets between 1 & 4, or is that so much work you may as well be replacing them all at the same time? All the best mate.
@shaughnharris6 жыл бұрын
That's Awesome
@bwholz6 жыл бұрын
The thing that got me is the output shaft (front Sprocket) appeared to be turning clockwise . At 12:00
@mRblu3B3rRymAn6 жыл бұрын
I am trying to get the same bike running and I have a question. What do you do with the tubes coming out of the bottom of the carbs? I cannot get them to stop leaking fuel and I am confused as to what to do next. Thanks!
@whorayful93616 жыл бұрын
Just wondering about the effects of using the gear change lever as your jumper cable earth point, is there a risk you could burn a bearing race in the selector/gearbox area with the high currents? Ray
@Gruxxan6 жыл бұрын
i think its flooding number 4 because the float level is too high
@darwindwelle52676 жыл бұрын
Yep my thoughts too do you see the smoke out of 4?
@suzukienthusiast6 жыл бұрын
Sync the carbs with vacuum gauge
@dochollowood57636 жыл бұрын
lol- oh great thought I would have to wait a week to see it run Yeah the cylinder on the right has a problem...
@philippe165 Жыл бұрын
Any part 23? To see it sound?
@wickedxe6 жыл бұрын
If compression and spark are good, it can only be fuel.
@wickedxe6 жыл бұрын
0490231352 I would love to chat at some point
@LukeLovett6 жыл бұрын
Oh the poor neighbours....
@tcherf6 жыл бұрын
smells like fuel issue,not electric, because if first cylinder is working correctly, the fourth should be ok too, only difference is in wiring from coil to spark. Maybe try to switch condenser in ignition circuit, but is easiest to switch whole circuit from points to spark plug.
@Mercmad6 жыл бұрын
you have smellavison? how does that work ?
@tcherf6 жыл бұрын
kinda.. next time ill use "i think its a" ;)
@johnrimmer58126 жыл бұрын
Hello mate any reason for fitting the "stubby pipes" as opposed to letting the exhaust vent through ports?
@darwindwelle52676 жыл бұрын
Yes warped valves don't ever do it!!!
@johnrimmer58126 жыл бұрын
Darwin Dwelle what?
@Rambizzle4546 жыл бұрын
:)
@mickhulsen68256 жыл бұрын
check valve clearance again
@blairguinea68116 жыл бұрын
MUSIC !!!!!
@wollaminfaetter6 жыл бұрын
Some swearing and foul language should sort that little problem.
@bigears44266 жыл бұрын
Without pipes you can't tune it, I wouldn't even run it