SOHC.co.uk Forums > CB750

Carb setting

<< < (3/4) > >>

mgy66:
ok, I feel better now... wires are fine but worth checking. then still my advice would be to check the needle clips are in the same position nbr 4. and check your jets are stock...

i went through the exercise and just discovered that i had one cylinder (usually running at 80-90defF coldest) with a clip at nbr 3 where all other were at nbr 4... i have been trying to tune this bike for a year now. went through pilots/mains/float levels. now my carbs are in a ultrasonic cleaning. 1/2 hour 45degC. you would not believe the amount of dirt these things accumulate over the years.

if you are stuck with ideas and have some spare time and do not know your carbs... go for the full mounty clean up. the only drawback is getting the spares to rebuild. cant find the rubber that goes on the top cap cover where the slide rods go through...

cheers
marc

El__burro:
Today I started off with checking the GAP on both points, its ok (0.3-0.4mm).
Then I removed the carbs and checked the clip on each needle,  they were all on the 4th from the top, then I adjusted the floats to 26mm.
All the jets are stock 40/110.
Eventually it didn't make much difference.
The exhausts 1 and 3 are much colder than the other 2.
(Thinking back aren't the points connected 1-4, 2-3).
I'll check spark plugs tomorrow.
If no success I'll have a look at the valves.

Thanks
El__burro

Bryanj:
I hope you mean 0.3mm to 0.4mm

El__burro:
yes, correct.
thanks

El__burro:
It looks like it's sorted!
Although it's pouring down I have managed to check for sparks plugs and their caps the last being the culprit.
The caps for spark plug 1 and 3 were not properly screwed in so the plug wouldn't make a proper spark, also the 1 plug was arching and that required some gap setting.
To date I haven't heard a nicer sound.
Probably since (almost) completing the bike this is the first time I have fire on all 4.

(ps I'll upload a new video soon)

thanks to all of you for your support
el__burro

Navigation

[0] Message Index

[#] Next page

[*] Previous page