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Carb Issue - 3/17/2008 6:59:37 AM

rivc1982

Posts: 10
Joined: 3/17/2008
Status: offline

Hey everybody,

I decided to check my carburetor for any varnish after having some power issues on WOT. I pulled the carburetor off and cleaned out the float bowls, floats, float valve / needle, diaphragm, main jet & slow jet. Everything seemed to be pretty clean already but I continued anyways figuring it wouldn't hurt anything. I was wrong =).

After re-installing the carbs the damn bike won't start! I turn the ignition on and I can hear it trying to start but the bike won't turn. So I check all my cables and everything looks good. I then decide to recheck the carbs and find that only float bowl #1 (far left side) had fuel in it and 2 through 3 barely have any and # 4 is still dry. After that I assumed I may have clogged one of the jets or air vents internal to the carb so I opened up the carbs and ensured the passages were clear by blowing air through them and feeling for exiting air.

After re-installation it still will not start..

I am not a carb guru but followed instructions posted on how to clean carbs from this forum. Is it normal for only the #1 carb to have fuel in it until started after carb re-installation or should all the carbs have fuel in the float bowls once the petcock valve is opened?

Any input on getting my baby running again would be greatly appreciated!

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00' Blk/Org F4
07' Suzuki M109R

Post #: 1

RE: Carb Issue - 3/17/2008 7:08:04 AM

rivc1982

Posts: 10
Joined: 3/17/2008
Status: offline

Another quick question for other f4 owners. When you turn the ignition key to ACC or on, do you hear your fuel pump make noise? Just wondering because when I turn my bike to on I don't believe I hear any sound from the bike at all. I'll recheck it when I get home just to be sure.

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00' Blk/Org F4
07' Suzuki M109R

(in reply to rivc1982)

Post #: 2

RE: Carb Issue - 3/17/2008 10:41:31 AM

brveagle

Posts: 112
Joined: 6/8/2006
Status: offline

try some starter fluid. The bowls on the f4 are really hard to "get full" after being emptied.

Try spraying it 4-5 times and it should start to suck some fuel into the adjacent bowls.

(in reply to rivc1982)

Post #: 3

RE: Carb Issue - 3/17/2008 11:03:25 AM

rivc1982

Posts: 10
Joined: 3/17/2008
Status: offline

Sounds good. I'll go ahead and pick some up today after work and give it a shot. Thanks for the input.

I never used starting fluid before so where in the intake system should I spray it? in the air box below the filter, the throttle body, front fairing air vent?

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00' Blk/Org F4
07' Suzuki M109R

(in reply to rivc1982)

Post #: 4

RE: Carb Issue - 3/18/2008 10:29:43 AM

brveagle

Posts: 112
Joined: 6/8/2006
Status: offline

I usually give a quick spray into the throttle body.. You do NOT want alot of the stuff.

Just maybe a 1-2 second spray.

(in reply to rivc1982)

Post #: 5

RE: Carb Issue - 3/19/2008 8:23:13 PM

allenpa5

Posts: 73
Joined: 6/22/2007
Status: offline

either it needs starting spray like you said or you might have damaged something in the carbs. If you were scrubbing hard on the diaphragms or sprayed carb cleaner on the diaphragms then they might be ruined. If they're ruined then (I think) there would be no suction to get any fuel in the float bowls, etc.. so check the diaphragms and make sure the needles are straight and clear.

_____________________________

2000 Yellow/Black CBR F4
10k HID kit, flush mount fronts, taillight integrator, blue illumiglo gauges, Two Brothers carbon fiber exhaust, carbon fiber mirrors, CF levers, CF bar ends, rear tire hugger.

Next project: F4i seat conversion

(in reply to brveagle)

Post #: 6

RE: Carb Issue - 3/20/2008 5:17:26 PM

rivc1982

Posts: 10
Joined: 3/17/2008
Status: offline

Alright, I went ahead tried the starting spray once with no success. I could hear it starting to turn the engine but was not enough to get fuel into the bowls. So I went ahead and disconnected the fuel pump hose than runs to the "T" splitter at the carbs and ran it straight to the fuel tank. Gave it a crank and she ran just fine. I idle'd it out with the stop throttle and throttle response was pretty crisp in comparison to what it was like before just on the kick stand.

Funny thing was, while it was running with direct fuel I could hear the fuel pump thumping away. So I believe I may have a couple of possibilities to why it didnt start.

1. The fuel pump is not pumping strong enough
2. The carb vacuum system may be restricted somewhere
3. I didnt try enough times with the starting fluid to get fuel in the bowls =)
4. Fuel pump relay malfunctioning...

It's dark out now but when I get a chance I am going to hook it back up to the pump and see how she runs. I'm hoping its just possibility #3 =) If I am missing something please let me know.

Thanks brveagle & allenpa5 for helping out!

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00' Blk/Org F4
07' Suzuki M109R

(in reply to rivc1982)

Post #: 7

RE: Carb Issue - 3/23/2008 12:59:59 PM

ajlong

Posts: 223
Joined: 1/31/2006
Status: offline

I went through a bunch of headache getting my bike started after a carb cleaning, turns out it was the fuel tank petcock. I had to turn in on and off a few times to get the fuel to run through it. I even went as far as to take it out and clean it, but it was clean, I think there's something in the design that causes the fuel valve to "stick" closed, or I need to replace the petcock all together. Everytime I shut off the fuel, I have to rotate the dial a couple of times on/off/on in order to get the fuel flowing again. Just a thought, your symptoms sounded the same as mine.

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To many mods to list.... To many mods yet left to do.

(in reply to rivc1982)

Post #: 8

RE: Carb Issue - 3/23/2008 4:58:33 PM

itsmrjames

Posts: 11
Joined: 3/18/2008
Status: offline

I had a POS truck that wouldnt start so I took off a fuel line to check the pump and it was squirtin just fine. spent a bunch of time and money trying to diagnose it and it turns out that even though the fuel pump was pumping it was like 10 psi instead of 30 psi .. you get the point. it should be pretty easy to replace and cheap on ebay....good luck and let us know what the end is..

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99 F4-shitloada miles-K&N- -1/+2 -D&D race pipe-roll of gorilla tape-Pilot 2CTs-100 octane race gas daily rider!

(in reply to ajlong)

Post #: 9

RE: Carb Issue - 3/24/2008 12:56:56 PM

rivc1982

Posts: 10
Joined: 3/17/2008
Status: offline

Well I hooked it back up to the fuel pump and she still turns on. I still have the bogging issue whenever I open the throttle up wide. I guess maybe my fuel pump could possibly be bad and not providing enough pressure, but I think it is more likely that the carbs need synchronizing. When she idles i can hear a slight pop come out of the exhaust every couple of seconds. It runs around fine at low speed increases but as soon as I decide to get on it, it bogs down.

I think I am just going to have it sent to the shop to get a new air filter, valve clearance check and carb sync. The bike has about 43k miles on it!

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00' Blk/Org F4
07' Suzuki M109R

(in reply to itsmrjames)

Post #: 10

RE: Carb Issue - 3/25/2008 12:22:29 PM

rivc1982

Posts: 10
Joined: 3/17/2008
Status: offline

Well called the shops and got a quote but I decided not to pay. After going through the manual I feel like I can do the carb sync and valve clearance check myself.

I also decided to check my throttle position sensor this morning and found it to be faulty! I think this is the whats causing my bogging down issue on WOT. I hooked up the multimeter to the sensor directly and got a good reading at the rested throttle positon, but as I twisted the throttle into fully open the reading did not change at all! So I went ahead and ordered a new one for around 40. I really do think that this is the cause of my issue. Bike runs fine on low throttle increases but then doesn't get the proper signal when I decide to get on it.

Hope it gets fixed after the replacement. I'll let you guys know how it turns out.

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00' Blk/Org F4
07' Suzuki M109R

(in reply to rivc1982)

Post #: 11

RE: Carb Issue - 3/28/2008 2:26:15 AM

mach9

Posts: 192
Joined: 3/12/2005
Status: offline

I'm guessing its too early to have this fixed yet...but tell me how it turns out. I have 45k on the clock ;). Still runs great, though looks a little rough after being stolen.

(in reply to rivc1982)

Post #: 12

RE: Carb Issue - 3/28/2008 5:23:33 AM

rivc1982

Posts: 10
Joined: 3/17/2008
Status: offline

Yeah, I'm still on standby for the TPS. The shop said it should be in by today - I'll post the results as soon as I found it. The waiting is driving me mad!

I am also in the 40k mi range

< Message edited by rivc1982 -- 3/28/2008 5:31:13 AM >

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00' Blk/Org F4
07' Suzuki M109R

(in reply to mach9)

Post #: 13

RE: Carb Issue - 3/30/2008 4:54:43 PM

rivc1982

Posts: 10
Joined: 3/17/2008
Status: offline

FYI....parts on backorder so I am on standby..

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00' Blk/Org F4
07' Suzuki M109R

(in reply to rivc1982)

Post #: 14

RE: Carb Issue - 3/30/2008 5:39:29 PM

Nauree