Pilot jet /main jet size - hornet 600 (Cb 600 f3)

[rehmh05]

Symptoms ; difficulty starting without choke ... running rich smell - also doesn’t go past 85 mph (about 8k rpm in every gear- almost full rpm in neutral - coughs and splutters around this rpm like it’s choking / out of fuel / too much fuel ?) this issue was from the time I bought the bike

I’ve opened up my float bowls of my carbs to clean out suspected jets blocked And I found completely different sizes and am completely confused where to go next / what to do

1) the pilot jets are 40s - Haynes manual says 40
2) main jets are 105 and 108 - Haynes says 100 and 102

My question :
1) After cleaning them out will they be ok to use in the configuration they are in? Or are they the cause of lack of top speed / acceleration / hard starting / limited rpm

2) do I need to also check the jet needles ? The bolts look seized and I already had a lot of trouble opening the float screws

Anything else I should know / do?

Ps. Spark plugs been changed about 2 months ago by myself and it’s running better but still not right
____________________
- CBT 31/10/12 - CBR 125 bought 01/11/12
- Theory: 07/11/12 - Mod 1: 19/11/12 - Mod 2: 28/11/12
- 24/08/13 - Bandit 600

[stinkwheel]

I'd say if it has been running properly on them at some point, leave it at that for the time being.

Does it have a standard airbox/air filter/exhaust? I wonder if it's had a dynojet kit fitted.?

Looking at the hornet instructions, a dynojet kitted bike will have an extra washer above the E-clip on the throttle needle.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[rehmh05]

[stinkwheel]

[rehmh05]

[jaffa90]

"""Ps. Spark plugs been changed about 2 months ago by myself and it’s running better but still not right"""

What did the old spark plugs tell you?

[stinkwheel]

Hang on though. I just went to check a parts list and it looks like a CB600F3 (2009/10) is fuel injected?

What year bike is this?
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[jaffa90]

[stinkwheel]

[jaffa90]

Why not choke /seal the air intake by 75% and test again.

[stinkwheel]

In fairness. A 600 hornet topping out at 8,000rpm/85mph. I'd be querying if it's running on all 4 cylinders.

Are all 4 exhausts getting hot? (don't touch them, put a drop of oil on the header pipes and see if it burns off).
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[rehmh05]

[rehmh05]

Sorry guys not received any message (updates) until this morning .but I could send my message . Not sure if it’s a forum issue or my internet (because I posted my message and could see it )

anyway I Opened the diaphragms up: they all contain a washer at top of needle - needle number is B97A (which is for cb600f-5 onward models ? model number of carbs is: 49 FA

I can’t really check the cylinder temperature without putting it all back together (something I should have at the start )

Model is 2003 Cb 600 f2 . Haynes showing cb600f w- 4 models as 100 and 102 ?

pictures of sparks coming up... also note: spark plugs that were instlled were cr8ehix-9 - whereas cr9eh -9 were supposed to be in there. i put CR9EHIX-9

https://ibb.co/vB23KMj
https://ibb.co/MC1qgjp
____________________
- CBT 31/10/12 - CBR 125 bought 01/11/12
- Theory: 07/11/12 - Mod 1: 19/11/12 - Mod 2: 28/11/12
- 24/08/13 - Bandit 600

[stinkwheel]

105/108 appears to be correct for a 2002 CB600 (2) according to the Honda parts list. Maybe the dealer had previous years stock still in and registered it on an '03 plate.

EDIT: Same list also shows CR9EH9 plugs as standard.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[rehmh05]

[rehmh05]

[jaffa90]

[rehmh05]

[rehmh05]

[stinkwheel]

[rehmh05]

[rehmh05]

Hi guys -

It has been sorted now ! Thank you to every single person who replied!!!!

For the benefit of other people : the sub air filter was disintegrated. When I opened the top end of the carbs - it had foam bit stuck in the tube between carb 2 and 3 . This was really gunked up and was probably restricting airflow from the sub air filter . I don’t know the purpose of the sub air filter but maybe it was stopping the diaphragms from moving or something ?! Can someone confirm this ?

But now it’s full power and I’m in love with it !!!

Thank you everyone
____________________
- CBT 31/10/12 - CBR 125 bought 01/11/12
- Theory: 07/11/12 - Mod 1: 19/11/12 - Mod 2: 28/11/12
- 24/08/13 - Bandit 600

[stinkwheel]

There are several little auxillay jets located behind the bellmouths, perhaps it was blocking one or more of these.
____________________
“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.