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Motorcycles » rec.motorcycles.tech » Re: Open throttle starting
| Re: Open throttle starting [message #785086] |
Mon, 17 July 2006 20:52 |
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Hello again everyone,
I hope the new message gets your attention and I don't have to
repost the problem. I am pretty POed about this bike acting up. I
thought I had it taken care of. Well, I had some trouble starting it
and so I pulled the plug on the hose that drains my airbox and left
about 1/4 of a gallon in the parking lot. Then it started a lot
better. So, Obviously there is a stuck float.
My questions is, Do I try Berryman's first or use the piece of
tubing on the drain nipple thing to find the float that is stuck. If
it is gum, then I suppose they could all use the cleanup. Could it be
that the float parts need replacement?
I think I'll try to get some berrymans to let sit in the floats for
a half hour and then go for a slow ride. FB always posts about it.
Well, If I want to fill the carb with Berrymans, how strong and where
do i put it in at. I thought about using a hose, draining the bowls,
and then filling through the drain nipples. Is this the best way?
Should the petcock solve this problem? I dont' have an on/off
petcock, rather the on/Prime type. So, that requires vacuum to pull
fuel from the tank, would a stuck float pull fuel from a properly
operating fuel valve? How do I trouble shoot that? I would Like to
avoid reworking my carbs if possible, I've never done it and I'd rather
avoid more trouble caused by me being clumsy with things I don't know
how to do. Thanks for your patience with the new guy.
Tim
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| Re: Open throttle starting [message #785088 ] |
Mon, 17 July 2006 21:07 |
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2000 Suzuki katana gsx750f, 1984 Honda Magna V45 <fixit335 [at] excite.com> wrote:
> Hello again everyone,
> I hope the new message gets your attention and I don't have to
> repost the problem. I am pretty POed about this bike acting up. I
> thought I had it taken care of. Well, I had some trouble starting it
> and so I pulled the plug on the hose that drains my airbox and left
> about 1/4 of a gallon in the parking lot. Then it started a lot
> better. So, Obviously there is a stuck float.
> My questions is, Do I try Berryman's first or use the piece of
> tubing on the drain nipple thing to find the float that is stuck. If
> it is gum, then I suppose they could all use the cleanup. Could it be
> that the float parts need replacement?
> I think I'll try to get some berrymans to let sit in the floats for
> a half hour and then go for a slow ride. FB always posts about it.
> Well, If I want to fill the carb with Berrymans, how strong and where
> do i put it in at. I thought about using a hose, draining the bowls,
> and then filling through the drain nipples. Is this the best way?
> Should the petcock solve this problem? I dont' have an on/off
> petcock, rather the on/Prime type. So, that requires vacuum to pull
> fuel from the tank, would a stuck float pull fuel from a properly
> operating fuel valve? How do I trouble shoot that? I would Like to
> avoid reworking my carbs if possible, I've never done it and I'd rather
> avoid more trouble caused by me being clumsy with things I don't know
> how to do. Thanks for your patience with the new guy.
If fuel is leaking from the tank and overflowing from one or more carbs
when the engine is not running, you have two problems. A leaky vacuum
petcock, and a leaky inlet float valve. If all your carbs' inlet valves
are working right, you won't notice a defective petcock unless it leaks
externally.
Yamaha makes a special carb cleaner designed to be used in the exact
way you propose-- drain the carbs and fill the carb bowls with the
cleaner, mixed with gasoline. Just make a little funnel and fill the
carbs via the normal fuel line after you disconnect it from the petcock.
Hopefully a chemical cleaning without removing the carbs will fix your
leaky inlet valve problem, and you are wise to avoid ripping your carbs
apart without knowing how to do it. It's certainly not hard but there are
a few delicate pieces in there that are easy to wreck if you are clumsy.
You're also going to have to fix your leaky vacuum petcock.
--
'01 SV650S '99 EX250-F13 '98 ZG1000A-13 '81 CM400T
OMF #7
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| Re: Open throttle starting [message #785090 ] |
Mon, 17 July 2006 21:18 |
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Mark Olson wrote:
> Yamaha makes a special carb cleaner designed to be used in the exact
> way you propose-- drain the carbs and fill the carb bowls with the
> cleaner, mixed with gasoline. Just make a little funnel and fill the
> carbs via the normal fuel line after you disconnect it from the petcock.
> Hopefully a chemical cleaning without removing the carbs will fix your
> leaky inlet valve problem
I'll try this.
> You're also going to have to fix your leaky vacuum petcock.
How do i do this? BikeBandit wants 85 big ones for a new assembly.
Can I buy a kit? Where? I Put in the link for the convenience of
anyone willing to help me.
http://houseofmotorcycles.bikebandit.com/partsbandit/oem_sch ematic_view~schem_dept_id~1008054~section_dept_id~1~section_ dept_name~OEM+%28Stock%29+Parts~dept_type_id~2~model_dept_ye ar~2000~model_dept_mfr~Suzuki~model_dept_id~987331~model_dep t_name~GSX750FY+KATANA.asp
Thanks!
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| Re: Open throttle starting [message #785091 ] |
Mon, 17 July 2006 21:26 |
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2000 Suzuki katana gsx750f, 1984 Honda Magna V45 wrote:
> Well, I had some trouble starting it
> and so I pulled the plug on the hose that drains my airbox and left
> about 1/4 of a gallon in the parking lot. Then it started a lot
> better. So, Obviously there is a stuck float.
As Mark said, you might also have a leaky automatic petcock/ The rubber
diaphragm might leak or the vacuum operated shutoff valve on the
backside of the petcock might not be seated. The engine vacuum pulls
the valve open and a little spring pushes it closed.
However, if there is a lot of rust and debris in the bottom of your gas
tank, you might have crud holding the automatic shut off valve open.
So, disconnect the fuel hose from the petcock and watch to see if the
petcock keeps dripping gasoline or if a steady stream of gasoline comes
out.
It may be time to remove the gas tank and take off the petcock and
flush out the gas tank with fresh gasoline.
Another way a petcock can leak is when the four-holed rubber grommet
gets a groove worn in
it from operating the selector lever while the grommet is dry. This
happens when an owner leaves the machine set unriddden for months at a
time and then tries to select the RES or PRI position.
The PRI position allows gasoline to flow out of the PRI port in the
petcock to the RUN port, but you can get unwanted fuel flow even when
the PRI position is not selected on the petcock.
I have had occasion to open up the petcock and flip the 4-holed grommet
over, or rotate it to a different position so the groove between holes
didn't line up between the PRI port and the RUN port. Then, when I had
a chance to get to the motorcycle parts store, I would buy a new
grommet.
> My questions is, Do I try Berryman's first or use the piece of
> tubing on the drain nipple thing to find the float that is stuck.
I think it's quicker just to put the Berryman's in the gas tank and I
make a practice of routinely doing that three or four times a year.
> If
> it is gum, then I suppose they could all use the cleanup. Could it be
> that the float parts need replacement?
It might just be gum and varnish on the float valves. Or, there might
be crud on the float valve seat. I have seen a piece of crud no bigger
than a fly speck keep the float valve from seating.
> I think I'll try to get some berrymans to let sit in the floats for
> a half hour and then go for a slow ride. FB always posts about it.
> Well, If I want to fill the carb with Berrymans, how strong and where
> do i put it in at. I thought about using a hose, draining the bowls,
> and then filling through the drain nipples. Is this the best way?
If I need to put the berryman's into the carburetor directly, I mix it
50/50 with gasoline and then squirt it down the fuel hose until it
fills all four carbs, Then I let it set for half an hour before I
reconn ect the fuel hose and start the engine. It will run on
Berryman's mixed with gasoline and the mixture will get sucked through
the idle ports and idle jets and clean them out.
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| Re: Open throttle starting [message #785092 ] |
Mon, 17 July 2006 21:32 |
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2000 Suzuki katana gsx750f, 1984 Honda Magna V45 <fixit335 [at] excite.com> wrote:
> Mark Olson wrote:
> > You're also going to have to fix your leaky vacuum petcock.
>
> How do i do this? BikeBandit wants 85 big ones for a new assembly.
> Can I buy a kit? Where? I Put in the link for the convenience of
> anyone willing to help me.
Ron Ayers has the fuel cock assembly for $73.85 plus shipping. I've had
sucess printing out the Ron Ayers website page with the price and
part number showing and handing it to the parts counter person at the
local dealership. Sometimes they're so surprised at how much they are
overcharging you, they give it to me for the Ron Ayers price.
However, you don't need the whole petcock, just the rubber bits.
Someone undoubtedly sells them as a kit. Google for
katana petcock repair kit
You'll get about a million (actually 540) hits. Count on paying
about $25.
Here's one on ebay, $22 buy it now, $2 shipping:
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem& ;item=170007005489
or just search for item no. 170007005489
--
'01 SV650S '99 EX250-F13 '98 ZG1000A-13 '81 CM400T
OMF #7
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| Re: Open throttle starting [message #785093 ] |
Mon, 17 July 2006 21:39 |
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FB wrote:
> As Mark said, you might also have a leaky automatic petcock/ The rubber
> diaphragm might leak or the vacuum operated shutoff valve on the
> backside of the petcock might not be seated. The engine vacuum pulls
> the valve open and a little spring pushes it closed.
>
> So, disconnect the fuel hose from the petcock and watch to see if the
> petcock keeps dripping gasoline or if a steady stream of gasoline comes
> out.
I have taken off the tank numerous times. To change the plugs, try and
clean the carbs.....I usually set it upright and I don't ever recall
the tank dripping gasoline on the floor or anything. However, one time
I got it back together and could not start it. I just wiggled the
selector lever on the petcock and presto, she ran right away. So, I
don't doubt that something could be up, but it doesn't leak when
disconnected.
PS. I have to look for Berrymans after work. I think my parts store
only carries the aerosal form. I'll try a different store if I have
to.
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