Honda-SOHC
SOHC.co.uk Forums => CB750 => Topic started by: Andrew-S on June 09, 2021, 03:16:00 PM
-
So, today I decided to make a start on trying to get my K1 to idle by removing the slow jets to check and clean them. Nope, the first one snapped off in the carb body so now the carb bank will now have to come off!
-
Oh poo 😢😢😢😢😢
-
I feel for you Andrew what started as a simple job to adjust the mixture turns into hours of work - we've all been there mate.
-
That's a pain. As Ted said, We have all been there, done that, ruined a day and know it's going to get expensive!
Hopefully the remains will come out easily.
-
Hmm, rhymes with "clucking bells!" What a pain. Good luck with getting it out.
Sent from my POT-LX1 using Tapatalk
-
Know the feeling, the same thing happened on my F1, I had to very carefully drill it out, not nice.
Cheers
Dennis
-
That is crap! Was the float pins that gave me grief on my K3. Good luck with sorting.
-
That's it, I've just finished counting to a million and I'm all calm now............ ;D I'll be taking the carb bank off next week, I'm guessing the air box is first?
-
I got a wave of motivation today and whipped the carb bank off and they are surprisingly clean - hopefully the broken slow jet will be as easy to remove as the carbs and the other 3 don't break off too. Then they'll be stripped down inspected, ultrasonically cleaned, rebuilt and balanced and I might get to ride the K1 this year after buying it in 2018 after UK Pete took the old girl off the road in 2015.
Interestingly, the broken slow jet was a 35; I thought they were 40 as standard, so this may have contributed to why it wouldn't idle?
-
Pretty sure that the jet should have been 40, see the attached chart, I know mine was (CB750F1), found the photo of my broken jet, looks pretty much like yours.
(https://imagizer.imageshack.com/img922/2328/K1li48.jpg)
(https://imagizer.imageshack.com/img924/9336/NnxHJi.jpg)
Cheers
Dennis
-
Seems common problem - in my K1's case they may have been overtightened or fuel varnishing around the threads which has acted like 'Loctite'!
There's some debate on jet size on another thread I've got running.
Cheers,
Andrew
-
It wasn't surprising on mine as the bike had sat in the garage for ten years while I worked away, the carbs were that full of gunge that I could not open the throttle.
(https://imagizer.imageshack.com/img921/9900/zRlQxU.jpg)
The jets in mine were 40 and that is how the bike left the factory as I have owned it since new and the carbs have never been off before, mind you mine id an F1 so may be different to your bike
Cheers
Dennis
-
That is pretty gungy Dennis, but not too bad considering - my K1 has been off the road since 2015 and luckily the fuel tap had been turn off so the carbs weren't too bad at first glance, so it'll be interesting to see what the insides are like.
Cheers,
Andrew
-
Gertcha!
This isn't my handiwork, I'm too heavy handed for such intricacies! Well done Mark Kelleher of MK Classics in Woodley who used heat and more finesse that I can must muster......
-
Happy for you, it's nice when it works out like that.
Cheers
Dennis
-
Nice and clean looking carb in the photo - amazing what standing fuel does over time.
-
Well, the carbs have been stripped and were pretty clean inside so bodies were cleaned by hand as I wanted to keep the original finish, then reassembled using the Keyster service kit with 40/110 jets (35/120 were removed) by Mark at MK Classics in Woodley. I've just refitted them to the K1 with new intake rubbers, which were about 8mm longer than the originals that came off (??). If I get time I'll refit the airbox etc tomorrow and hopefully fire the old girl up off a remote tank.
Cheers, Andrew