HIGH SPEED TURN OFF ?

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HIGH SPEED TURN OFF ? - 4/20/2006 11:26:41 PM

crucialfate

Posts: 137
Joined: 2/11/2006
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ok, last friday and then again on sunday, i had my bike somewhere between 105 & 120 mph and it CUTS OFF!!! Then i have to coast it down to around 40-35mph so the starter gear will catch for a re-start. does anyone know why this would happen? I have had my bike that high before when i first bought it and never had a problem with it.

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1987 CBR 1000F Hurricane

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RE: HIGH SPEED TURN OFF ? - 4/21/2006 12:54:59 AM

Firefox11

Posts: 110
Joined: 4/14/2005
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Have you ever thought that maybe the fuel filter is a bit clogged??? If it is, at high speeds it doesn't have enough fuel feed to keep the engine running at RPM's so the engine cuts off. Between the time you let it coast, it has enough time for the gas to catch up through the dirty filter and the engine will start right back up and run like nothing ever happened. If you checked the filter, then I might go a little more toward ignition and check the Coils and make sure they aren't arcing or getting hot and shutting off. Its either the gas or ignition, I bet its the gas though. Unless you have a CBR with the fuel pump, it might not be giving the bike enough gas at high speeds thus the shut off as well. Something to think about.

Let us know what you find.

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Need to be doing at least 140mph ! - 4/21/2006 11:50:33 AM

jim

Posts: 95
Joined: 1/23/2006
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Hiya crucialfate

Firefox11 is bang on the money its gota be a fuelling problem! it could be either to much air or too little fuel.
Has the Air filter or the exhaust be changed lately as some people re-jet the engine after such modifications, I did hear that the CBR1000F is prone to electrical overheating as the air flow under the tank where the electrical stuff is kept is non existent, I personally have had no such problems and my CBR is ridden like its nicked so it gets white hot.
Check inside your tank to see if its rusty, also check the fuel tank tap to see if its got debris in it what could starve the engine of fuel as-well.

Best Wishes

Jim

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RE: HIGH SPEED TURN OFF ? - 4/21/2006 7:36:18 PM

1000F

Posts: 31
Joined: 4/13/2006
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To Crucialfate,

Last summer I had a problem when my 1987 CBR 1000F was sputtering over 8000 RPM.
Kind of like it was hitting revlimiter, I figured it was a fuel issue, but the fuel pump was full of gas.
I started looking at the modulator beside the fuel pump but that was not it.
I checked the fuel filter, everything else was fine, so I started fooling with the fuel pump with no luck
and ended up calling my mechanic. He said try pulling on the wires leading to the fuel pump to see if there were any loose connections so I did and it ended up fixing the problem. Mechanic said if the power to the fuel pump is shorting, the pressure coming out of the fuel pump causes carborator issues.

Let me know if it works.

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Post #: 4

RE: HIGH SPEED TURN OFF ? - 4/21/2006 8:12:12 PM

MarkR

Posts: 975
Joined: 8/20/2005
From: Gold Coast, Australia
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Did you find that sometimes it would rev OK and if you got past 9000, it was OK?

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RE: HIGH SPEED TURN OFF ? - 4/21/2006 8:42:34 PM

1000F

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No, it was consistantly having troubles over 9000 rpm but it's a free fix and a 2 second check.

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RE: HIGH SPEED TURN OFF ? - 4/26/2006 1:12:03 AM

Rx7man

Posts: 279
Joined: 8/21/2005
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while we're on this subject, sometimes while idling in traffic for a while, my temp gets to about 1/2 on the guage, suddenly it'll miss like hell when i try to get moving again.. clutch in, rev a couple times, and then it's gone.. really hard problem to reproduce and find.. any tips?

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RE: HIGH SPEED TURN OFF ? - 4/26/2006 7:08:59 PM

crucialfate

Posts: 137
Joined: 2/11/2006
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sorry that it took me so ling to respond. i have pulled (tugged) the electrical wires.....nothing, air filter/ fuel filter......nothing. BUT.... a while back i noticed a small puddle of gas under my bike. (see post: GAS PUDDLE TO POND) well, i checked the petcock.....nothing. so i just bought a new fuel pump. well, now its doing the same thing. The small puddles (about 2-3 inches wide) of gas are back. I pulled my fairing and the damn thing leaks again. im thinking this has something to do with it, but dont know what else to do.

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1987 CBR 1000F Hurricane

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RE: HIGH SPEED TURN OFF ? - 4/26/2006 10:51:31 PM

1000F

Posts: 31
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maybe carb drains are loose
what's a petcock
100f

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RE: HIGH SPEED TURN OFF ? - 4/27/2006 12:09:33 AM

crucialfate

Posts: 137
Joined: 2/11/2006
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the part that switches from tank to reserve

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1987 CBR 1000F Hurricane

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RE: HIGH SPEED TURN OFF ? - 4/27/2006 6:39:31 AM

R1000

Posts: 1128
Joined: 1/30/2006
From: Sweden
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Have you opened and cleaned the carbs? If that hasn't been done for several years it could be a good time now. Check that all passages are open and that the small spring loaded pins on float needles are not stuck. They where on mine bike and I also had kind of a rev-limiter at about 6 k rpm. There is also a small nylon filter mesh behind each float valve seat that can be clogged. Before assembly the carbs, dont forget to check and set the float levels. Whan all this is done, and it's not difficult at all, you should not need to worry about carbs function for several years as long as the carbs are drained during prolonged storage. I removed the small fuel filters inside carbs meantioned above and mounted an in-line filter on the fuel hose so any debris from the tank is trapped before hitting the carbs.

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RE: HIGH SPEED TURN OFF ? - 6/22/2007 2:21:19 PM

phil056

Posts: 34
Joined: 4/8/2005
From: Long Island, NY
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quote:

ORIGINAL: R1000

Have you opened and cleaned the carbs? If that hasn't been done for several years it could be a good time now. Check that all passages are open and that the small spring loaded pins on float needles are not stuck. They where on mine bike and I also had kind of a rev-limiter at about 6 k rpm. There is also a small nylon filter mesh behind each float valve seat that can be clogged. Before assembly the carbs, dont forget to check and set the float levels. Whan all this is done, and it's not difficult at all, you should not need to worry about carbs function for several years as long as the carbs are drained during prolonged storage. I removed the small fuel filters inside carbs meantioned above and mounted an in-line filter on the fuel hose so any debris from the tank is trapped before hitting the carbs.

Are there specific steps on removing the carbs to clean them out? I would like to try it myself ,and not spend the big $$ bringing her in. I currently cannot get the bike to start, I believe my carbs are clogged as I haven't driven her in a long time? thanks

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1996 1000F(T) Under 6k original miles.

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RE: HIGH SPEED TURN OFF ? - 6/23/2007 12:41:44 AM

pacojoseph

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Joined: 5/10/2007
From: Philly, PA USA
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[[/quote]
Are there specific steps on removing the carbs to clean them out? I would like to try it myself ,and not spend the big $$ bringing her in. I currently cannot get the bike to start, I believe my carbs are clogged as I haven't driven her in a long time? thanks
[/quote]

How long has it been since you've ridden, and how hard are you trying to get the bike to start, i.e. are you using the bikes battery to try to start it?

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RE: HIGH SPEED TURN OFF ? - 6/23/2007 12:50:54 AM

R1000

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From: Sweden
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If the bike doesn't even start it seems to be something else than clogged carbs. Cleaning them is a rather straightforward process though. Remove the seat, side panels and the fuel tank. Unscrew the four connections to the air box and pull it somewhat rearward. Unscrew the clamps on the intake rubbers, the choke and the fuel wires. Then you pull back the carbs. The carbs may sit hard on old rubbers but they will loose if prying them back by a long screwdriver. There may be other small parts to remove to, but you will see when you are working, it is not difficult.

Remove the top of carbs and pull out the throttle assembly’s. Remove the fuel bowls at carb bottoms. Remove the jets, the floats, and the float valves and float seats. Remove the pilot jets. Then you are ready to use carb cleaning spray and blow all passages clean.

Don’t forget to check and set the float level when assembling. The vacuum diaphragms can be difficult to fit at assembly. Put some grease in the grooves on carbs and they will stay until the top cover is in place.

It is more than a year since I did this, I may have forgotten some details but the process is mainly as described above and simple.

If the bike doesn’t start at all, you may need to check the pulse generator resistance, the valve clearances, change plugs etc.

It could also be as simple that there is no remaning fuel in the carbs if the bike has not been used for long. It can take a minute for the bowls to fill by the vacuum controlled fuel valve (pet-cock, dont know the right term..) Some start-spray to air inlets will also help.

< Message edited by R1000 -- 6/23/2007 3:01:06 AM >

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RE: HIGH SPEED TURN OFF ? - 6/23/2007 8:38:43 AM

phil056

Posts: 34
Joined: 4/8/2005
From: Long Island, NY
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Thanks for the description. I'm still debating if I should just bring it to the shop to get it done right and actually have some type of warranty in case something goes not according to plan. Thanks again.

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1996 1000F(T) Under 6k original miles.

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