RE: Carb Issue
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RE: Carb Issue - 3/30/2008 9:15:34 PM
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jessej05
Posts: 228
Joined: 2/13/2008
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were is the tps located?
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RE: Carb Issue - 4/1/2008 5:04:48 AM
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rivc1982
Posts: 10
Joined: 3/17/2008
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Well I plan on synchronizing the carbs once I get the TPS sensor in and tested out, but why would I "have" to synchronize them if I didnt change any screw settings (pilot screw, sync screw)?
The TPS is located on the right side under the gas tank right next to where the two throttle cables stop.
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00' Blk/Org F4
07' Suzuki M109R
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RE: Carb Issue - 4/6/2008 10:29:58 AM
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Nsracing33
Posts: 54
Joined: 6/28/2007
Status: offline
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Hey everyone, after reading the posts in the forum i fear i might be having a simular carb issue with my bike. I just had it in the shop for a simple oil change and spring tune up (chain lube/tighten and such) and after being charged almost 200 dollars plus having the shop lose my liscense plate for a week, I have no desire to go back there. So here is the situation:
I took the bike out on wednesday for about 20 mins and it ran fine. Parked it in the garage and started it up saturday afternoon. I had the choke on full for about 2 mins while i was waiting for the bike to warm up. I got a call on my phone so i shut the bike off for a sec so i could answer it (letting it go off choke for a few secs first before i turned it off). When i restarted it with the choke, it seemed to start like normal but i noticed the rpms dropping. I decided to take off the choke a litttle and gave it some throttle and it stalled. I tried to let the carbs clear, assuming they were flooded but that didnt do anything. Now everytime i try to start it, the starter cranks and it may turn over a few times but thats it. I put in fresh fuel, took off the body fairings and checked the air filter. The fuel pump seems to be working ok.
What would you guys suggest i try for my next approach? Is it worth taking off the radiator to look at the spark plugs? I'll likely try putting some starter fluid into the throttle bodies through the airbox. Thanks in advance for any advice.
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RE: Carb Issue - 4/6/2008 11:08:36 AM
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Nauree
Posts: 2874
Joined: 6/16/2007
From: Ponchatoula, LA
Status: offline
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quote:
ORIGINAL: Nsracing33
Hey everyone, after reading the posts in the forum i fear i might be having a simular carb issue with my bike. I just had it in the shop for a simple oil change and spring tune up (chain lube/tighten and such) and after being charged almost 200 dollars plus having the shop lose my liscense plate for a week, I have no desire to go back there. So here is the situation:
I took the bike out on wednesday for about 20 mins and it ran fine. Parked it in the garage and started it up saturday afternoon. I had the choke on full for about 2 mins while i was waiting for the bike to warm up. I got a call on my phone so i shut the bike off for a sec so i could answer it (letting it go off choke for a few secs first before i turned it off). When i restarted it with the choke, it seemed to start like normal but i noticed the rpms dropping. I decided to take off the choke a litttle and gave it some throttle and it stalled. I tried to let the carbs clear, assuming they were flooded but that didnt do anything. Now everytime i try to start it, the starter cranks and it may turn over a few times but thats it. I put in fresh fuel, took off the body fairings and checked the air filter. The fuel pump seems to be working ok.
What would you guys suggest i try for my next approach? Is it worth taking off the radiator to look at the spark plugs? I'll likely try putting some starter fluid into the throttle bodies through the airbox. Thanks in advance for any advice.
how long ago was this? sounds like it got flooded. and if it was recently let it sit and dry out.
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RE: Carb Issue - 4/7/2008 1:51:49 PM
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Nsracing33
Posts: 54
Joined: 6/28/2007
Status: offline
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It had all happened saturday afternoon. I suspected that maybe the carbs were simply flooded but even after sitting overnight, they didnt clear and the same symptoms occurred. The only other oddity was when i checked the tank, it was almost empty even though the fuel light never came on. Obviously i added fresh gas still to no avail.
It really is a mystery as Ive already been out on the bike a few times this season and its been fine. The only conclusion i can think of is that maybe the plugs got gunked up from the choke being on for too long which is why im in the process of taking the whole front end apart so i can check them. Other than that id think maybe the fuel pump stopped working or its just a carb issue. Anyone have any other ideas?
On a side note, anyone know a good place to pick up a wrench for the spark plugs on the f4? (I never got a tool kit with the bike when i bought it used.)
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RE: Carb Issue - 4/9/2008 11:32:21 AM
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rivc1982
Posts: 10
Joined: 3/17/2008
Status: offline
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Wow that is a wierd one. So it ran fine until immediately after your got it from the shop or had you taken it out a few times after you got it out of the shop?
Sears, advance auto or walmart all carry spark plug sockets...
I am still waiting on my backordered TPS sensor. According to the shop it was released from the factory yesterday so it should be in by the end of this week or early next week. I CAN'T WAIT!!! been 2 plus weeks now..
How many miles do you have on yours? If your up there in the 40k's like me and you haven't had the carbs cleaned in a while it would hurt to take a look.
Here's the link I used. http://cbrforum.com/m_311016/tm.htm The bike did start up a little better after a thorough cleansing. They were pretty clean already but I figured it wouldn't hurt.
< Message edited by rivc1982 -- 4/9/2008 11:43:53 AM >
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00' Blk/Org F4
07' Suzuki M109R
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RE: Carb Issue - 4/25/2008 8:00:50 PM
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usmarine6211
Posts: 11
Joined: 4/25/2008
Status: offline
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I used a normal spark plug socket with 2 swivels and a short extension. It worked great.
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RE: Carb Issue - 6/22/2008 11:47:10 PM
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Nsracing33
Posts: 54
Joined: 6/28/2007
Status: offline
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Just realised that I never updated on what happened with the issue i was having. I replaced the spark plugs with the iridiums and that seemed to do the trick, or so i thought....
The bike ran fine for almost 2 months and then randomly i noticed the same exact symptoms happened again last week (bike started, rpms dropped, stalled and from that point on would not even catch while cranking, even after sitting for a few days). This time I approached the problem with a little more of an open mind. After reading a ton of posts in this forum from the last few months, i have accumulated a ton of tricks to try.
I rechecked the plugs and they looked very dry (no fuel reaching them). The bike had ran very smoothly previously so because it had only been sitting for a few days, i didnt suspect a carb issue was to blame. I sprayed some starter fluid into the throttle bodies and sure enough, it started right up for about 15 secs and then died again. I checked the fuel line out the tank petcock and fuel was flowing fine. I then disconnected the fuel line at the "T" before it enters the carborators. I noticed a little fuel flowed backward from the carbs. I decided to see if the fuel pump was working so i tried starting the bike while holding the disconnected line in my hand and sure enough, no fuel was pushed out... AND the bike started and ran without the fuel line attached!! I figured that could NOT be good for it so i shut it off and reattached the line.
From reading a different post in this forum, I heard that sometimes when another member would turn thier key to the "on" position with thier kill switch on "off", thier fuel pump wouldnt prime, BUT if they turned their key to "on" when the switch was on "run", the pump would prime. I tried this trick and sure enough when i turned my key on with the switch on "run", I heard the pump prime, something i hadnt heard in previous attempts. Now the bike is once again running great and I saved myself likely another costly trip to the shop.
Based upon my own troubleshooting I seem to have corrected my problem. From what i understand, the fuel pump primes when the bike is started and only actually PUMPS fuel when your riding at higher speeds. I think what happened on both occassions is when i started my bike, the pump didnt prime and hence didnt it allow fuel to flow to the carbs... which explains why the rpms would drop as existing fuel would burn up and the bike would stall and refuse to restart. If the fuel pump doesnt prime, does that mean that it doesnt allow fuel to pass through or it somehow creates a vaccum which doesnt allow the fuel to reach the carbs? Secondly, Do you guys think it would be worthwhile to replace my fuel pump and filter just to be safe?
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