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Bike won't accelerate

Started by chocker, August 01, 2013, 06:30:35 AM

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chocker

Hi,
I have a 93 FJ and when I'm in 4th gear at about 3000 RPMs doing about 60 - 70 km/hour trying to accelerate it will not go any faster. I pull on the throttle and no more acceleration. To get out of this I downshift then upshift and it works. This has happened to me a few times. It seems to happen when the bike is cold. After that one time it never happens again during the ride. Has anyone else had this problem?

Thanks,
Mark

jscgdunn

Be great to hear what other folks think....both of our '92s do this from time to time.  I feel it is related to the complex system used to ensure you do not run out of fuel...the ignition drops down to two cylinders.  Does not seem to matter if the tank is full or not.  After a few seconds it comes back and runs fine.

Jeff
92 FJ1200 2008 ZX14 Forks, wheels, 2008 cbr 600 RR swingarm
92 FJ1200 2009 R1 Swinger, Forks, Wheels, 2013 CBR 1000 Shock
90 FJ 1200 (Son # 2), Stock
89 FJ 1200 Built from parts: (Brother bought it) mostly 92 parts inc. motor
84 FJ 1100 (Son #1), 89 forks wheels, blue spots

ribbert

Quote from: chocker on August 01, 2013, 06:30:35 AM
Hi,
I have a 93 FJ and when I'm in 4th gear at about 3000 RPMs doing about 60 - 70 km/hour trying to accelerate it will not go any faster. I pull on the throttle and no more acceleration. To get out of this I downshift then upshift and it works. This has happened to me a few times. It seems to happen when the bike is cold. After that one time it never happens again during the ride. Has anyone else had this problem?

Thanks,
Mark

There's your problem, you've got to twist it.

Seriously, your not leaving the choke out too long are you? That would sort of be consistent with what you describe.

Noel
"Tell a wise man something he doesn't know and he'll thank you, tell a fool something he doesn't know and he'll abuse you"

jscgdunn

Quote from: ribbert on August 01, 2013, 08:55:41 AM
Quote from: chocker on August 01, 2013, 06:30:35 AM
There's your problem, you've got to twist it.

Seriously, your not leaving the choke out too long are you? That would sort of be consistent with what you describe.

Noel

Noel,
Not the choke, for sure, in our case.

Jeff
92 FJ1200 2008 ZX14 Forks, wheels, 2008 cbr 600 RR swingarm
92 FJ1200 2009 R1 Swinger, Forks, Wheels, 2013 CBR 1000 Shock
90 FJ 1200 (Son # 2), Stock
89 FJ 1200 Built from parts: (Brother bought it) mostly 92 parts inc. motor
84 FJ 1100 (Son #1), 89 forks wheels, blue spots

chocker

The choke is off at that point.

Mark

andyb

Weird.  Slides getting stuck down?


FJmonkey

Quote from: andyb on August 01, 2013, 03:17:21 PM
Weird.  Slides getting stuck down?

I was thinking of the slides not moving freely, then breaking loose and working properly again.
The glass is not half full, it was engineered with a 2X safety factor.

'86 Ambulance - Bent frame, cracked case, due for an overhaul
'89 Stormy Blue - Suits my Dark Side

RichBaker

Quote from: jscgdunn on August 01, 2013, 08:54:58 AM
Be great to hear what other folks think....both of our '92s do this from time to time.  I feel it is related to the complex system used to ensure you do not run out of fuel...the ignition drops down to two cylinders.  Does not seem to matter if the tank is full or not.  After a few seconds it comes back and runs fine.

Jeff

The ignition does NOT drop 2 cylinders!! I wish people would stop perpetuating this MYTH.....  The fuel pump is shut off, which causes the float bowls to run dry, which signals the rider to switch to reserve.   :dash2:
Rich Baker - NRA Life, AZCDL, Trail Riders of S. AZ. , AMA Life, BRC, HEAT Dirt Riders, SAMA....
Tennessee Squire
90 FJ1200, 03 WR450F ;8^P

jscgdunn



The ignition does NOT drop 2 cylinders!! I wish people would stop perpetuating this MYTH.....  The fuel pump is shut off, which causes the float bowls to run dry, which signals the rider to switch to reserve.   :dash2:
[/quote]

I stand corrected and better informed...thanks.  I am pretty sure I picked up that nugget on this fourm somewhere.

Jeff
92 FJ1200 2008 ZX14 Forks, wheels, 2008 cbr 600 RR swingarm
92 FJ1200 2009 R1 Swinger, Forks, Wheels, 2013 CBR 1000 Shock
90 FJ 1200 (Son # 2), Stock
89 FJ 1200 Built from parts: (Brother bought it) mostly 92 parts inc. motor
84 FJ 1100 (Son #1), 89 forks wheels, blue spots

Dan Filetti

Quote from: jscgdunn on August 02, 2013, 10:40:19 AM


The ignition does NOT drop 2 cylinders!! I wish people would stop perpetuating this MYTH.....  The fuel pump is shut off, which causes the float bowls to run dry, which signals the rider to switch to reserve.   :dash2:


So, what you're saying, is that the bike drops 2 cylinders to SAVE ON GAS, when it's low -Ahhh  -That clears that up -thanks!

:rofl2:

Dan
Live hardy, or go home. 

ribbert

Quote from: RichBaker on August 01, 2013, 07:38:29 PM

The ignition does NOT drop 2 cylinders!! I wish people would stop perpetuating this MYTH.....  The fuel pump is shut off, which causes the float bowls to run dry, which signals the rider to switch to reserve.   :dash2:

I never had occasion to look into this, nor am I interested until mine stops working. But as Rich, and no doubt others know, there is a distinct difference in the symptoms or feel of how electrical vs fuel interruption to a running motor present.
The indication that you need to switch to reserve in entirely consistent with fuel starvation, not electrical interruption. It also explains the short delay and 'progressive' return to full power after switching to reserve, while the carbs refill. If the switch restored power to the coils, restoration of power would be instant, like flicking a light switch, which it's not.

I agree with Rich 100%

Noel
"Tell a wise man something he doesn't know and he'll thank you, tell a fool something he doesn't know and he'll abuse you"

Dan Filetti

Noel-  I was poking fun at Rich a bit, -he was so emphatic...  In the event you did not get the subtlety of it...
Live hardy, or go home. 

fintip

I've never used my reserve switch, but I had heard this myth in the past.

For the '86-'88, however, do remember that there is no fuel pump, and it is controlled by a solenoid in the petcock--the reason why our petcock is so expensive. (Gives us an extra plug to deal with when reinstalling the tank, as well.)
fjowners.wikidot.com

Not everyone understands what a completely rational process this maintenance of a motorcycle is. They think it's some kind of a knack or some kind of affinity for machines in operation. They are right, but the knack is almost purely a process of reason.
-ZAMM

IBA:54952

Pat Conlon

All the FJ fuel reserve functions, being either petcock or fuel pump, are over rated. I don't like them.
1) Free Owners Manual download: https://tinyurl.com/fmsz7hk9
2) Don't store your FJ with E10 fuel https://tinyurl.com/3cjrfct5
3) Replace your old stock rubber brake lines.
4) Important items for the '84-87 FJ's:
Safety wire: https://tinyurl.com/99zp8ufh
Fuel line: https://tinyurl.com/bdff9bf3

fintip

You know, I'm not really strongly opinionated on them one way or another, though I have read (obviously) many pages worth of acrimony towards them.

But are the reserve solenoids on the '86 petcocks known to fail? And even if they do, does unplugging the sender solve the problem? My impression is just that people don't like nanny-features on their bikes, not that there is anything actually wrong with the features other than unnecessary complication from not doing it via mechanical means like every other bike out there.
fjowners.wikidot.com

Not everyone understands what a completely rational process this maintenance of a motorcycle is. They think it's some kind of a knack or some kind of affinity for machines in operation. They are right, but the knack is almost purely a process of reason.
-ZAMM

IBA:54952