wont stay running - Page 4

spldart · 06-10-2015, 03:37 PM

If the opening the needle is in is threaded for a bolt then there is supposed to be a seat there. That carb cannot even come close to regular operation without the seat.
By the way. The seat is usually the same color as the jets and it looks like a great big
jet.
Without it you will always be flooding.

mobleydrew · 06-10-2015, 03:40 PM

Then I guess I will be playing in the garage tonight taking a closer look and placing an order for a new one soon.

Thanks everyone for the advice. Ill let you know what happens.

mobleydrew · 06-10-2015, 07:33 PM

Sorry. I was mixing up my mental images of Honda VF1000R carbs with this one. Wrenching on 2 bikes at once. The VF carbs have the big 10mm threaded holders that the valve needle seat fits into.

There IS a valve needle seat in the GZ carb.

I rebuilt carb again, spraying everything out again.

I confirmed the following are in the right places for my 13F3 carb; #120 main jet, #17.5 pilot jet, Pilot air jet 1 #87.5 and pilot air jet 2 #120.

#14 on diagram in SM (page 4-3) is the starter jet. It has a #52.5 in it. I did not see another #52.5 listed on the Carb Spec page (4-2) of SM. Is 52.5 correct?

I will check/adjust the float level, reinstall and start up again to see if anything has changed.

mobleydrew · 06-10-2015, 07:43 PM

Since the #120 main and the #52.5 starter jet will thread and fit into either place, i suppose I could have installed the #120 into the starter jet previously. Would this have caused it to flood?

spldart · 06-10-2015, 07:47 PM

iirc the two small pilot/idle circuit jets were rather dissimilar. One had a tube with
holes down the length. Jet orifice size was different too.
The service manual isn't specific enough?
I'd imagine that would cause some substantial issues switching them.. But!
I really wouldn't know as I haven't tried it.

mobleydrew · 06-10-2015, 07:55 PM

Yeah, the SM doesnt specify that the starter jet is a 52.5. it does specify the others though. the 17.5 has the little holes down the length, as well as the main.

blaine · 06-10-2015, 08:54 PM

Quote:

Originally Posted by mobleydrew

Since the #120 main and the #52.5 starter jet will thread and fit into either place, i suppose I could have installed the #120 into the starter jet previously. Would this have caused it to flood?

Yes it would.

mobleydrew · 06-11-2015, 05:14 PM

Nope. No different. Even put in a new plug, since the orig was fouled by all of the fiddling.
Still will only remain running with idle turned up high.
I confirmed that it was sucking in air through air filter too.

Ichiban, from Ichiban Moto, is coming over this weekend to help me figure it out. He is local to me.

mobleydrew · 06-13-2015, 03:52 PM

The air passageways from Air Jet #1 (87.5) to Air Jet #2 (120) is clear. Thinking about it, carb floods, pours out towards air box. As it does, it gets sucked into Air jet #1 and out Air jet #2 which then gets sucked up into the top of the CV carb to the diaphragm.
Starter jet, with 57.5 jet removed. What is that thing in there and how do I remove it? Can I remove it? I want to make sure it is clean in there and not stopped up. (see picture).
I have adjusted float to spec. Still flooding. Perhaps I should adjust (lower) it some more.

spldart · 06-13-2015, 06:23 PM

I'm sorry. I'm drawing a complete blank at this point. Considering how clean looking the body of the carb appears to be... At this point if I were stuck I'd dunk the body of the carb in berryman chem dip then squirt it out with carb cleaner. Every orifice... I'm just not understanding why you'd have such problems with such a good carb :confused: :dunno:

06-10-2015, 03:37 PM	#31
spldart Senior Member Join Date: May 2015 Location: Stafford, Texas Posts: 604	If the opening the needle is in is threaded for a bolt then there is supposed to be a seat there. That carb cannot even come close to regular operation without the seat. By the way. The seat is usually the same color as the jets and it looks like a great big jet. Without it you will always be flooding. Login or Register to Remove Ads
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06-10-2015, 03:40 PM	#32
mobleydrew Member Join Date: May 2015 Location: Lake Forest, Illinois Posts: 36	Then I guess I will be playing in the garage tonight taking a closer look and placing an order for a new one soon. Thanks everyone for the advice. Ill let you know what happens. __________________ Drew in Lake Forest, Illinannoying Multiple motorcycle owner/restorer Yamaha '86SRX600, '87SRX250, Honda '85VF1000R, Ducati '67 250.
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06-10-2015, 07:33 PM	#33
mobleydrew Member Join Date: May 2015 Location: Lake Forest, Illinois Posts: 36	Sorry. I was mixing up my mental images of Honda VF1000R carbs with this one. Wrenching on 2 bikes at once. The VF carbs have the big 10mm threaded holders that the valve needle seat fits into. There IS a valve needle seat in the GZ carb. I rebuilt carb again, spraying everything out again. I confirmed the following are in the right places for my 13F3 carb; #120 main jet, #17.5 pilot jet, Pilot air jet 1 #87.5 and pilot air jet 2 #120. #14 on diagram in SM (page 4-3) is the starter jet. It has a #52.5 in it. I did not see another #52.5 listed on the Carb Spec page (4-2) of SM. Is 52.5 correct? I will check/adjust the float level, reinstall and start up again to see if anything has changed. __________________ Drew in Lake Forest, Illinannoying Multiple motorcycle owner/restorer Yamaha '86SRX600, '87SRX250, Honda '85VF1000R, Ducati '67 250. Login or Register to Remove Ads Last edited by mobleydrew; 06-10-2015 at 07:38 PM.
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06-10-2015, 07:43 PM	#34
mobleydrew Member Join Date: May 2015 Location: Lake Forest, Illinois Posts: 36	Since the #120 main and the #52.5 starter jet will thread and fit into either place, i suppose I could have installed the #120 into the starter jet previously. Would this have caused it to flood? __________________ Drew in Lake Forest, Illinannoying Multiple motorcycle owner/restorer Yamaha '86SRX600, '87SRX250, Honda '85VF1000R, Ducati '67 250.
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06-10-2015, 07:47 PM	#35
spldart Senior Member Join Date: May 2015 Location: Stafford, Texas Posts: 604	iirc the two small pilot/idle circuit jets were rather dissimilar. One had a tube with holes down the length. Jet orifice size was different too. The service manual isn't specific enough? I'd imagine that would cause some substantial issues switching them.. But! I really wouldn't know as I haven't tried it. Login or Register to Remove Ads
	0

06-10-2015, 07:55 PM	#36
mobleydrew Member Join Date: May 2015 Location: Lake Forest, Illinois Posts: 36	Yeah, the SM doesnt specify that the starter jet is a 52.5. it does specify the others though. the 17.5 has the little holes down the length, as well as the main. __________________ Drew in Lake Forest, Illinannoying Multiple motorcycle owner/restorer Yamaha '86SRX600, '87SRX250, Honda '85VF1000R, Ducati '67 250.
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06-11-2015, 05:14 PM	#38
mobleydrew Member Join Date: May 2015 Location: Lake Forest, Illinois Posts: 36	Nope. No different. Even put in a new plug, since the orig was fouled by all of the fiddling. Still will only remain running with idle turned up high. I confirmed that it was sucking in air through air filter too. Ichiban, from Ichiban Moto, is coming over this weekend to help me figure it out. He is local to me. __________________ Drew in Lake Forest, Illinannoying Multiple motorcycle owner/restorer Yamaha '86SRX600, '87SRX250, Honda '85VF1000R, Ducati '67 250. Last edited by mobleydrew; 06-12-2015 at 01:38 PM.
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06-13-2015, 06:23 PM	#40
spldart Senior Member Join Date: May 2015 Location: Stafford, Texas Posts: 604	I'm sorry. I'm drawing a complete blank at this point. Considering how clean looking the body of the carb appears to be... At this point if I were stuck I'd dunk the body of the carb in berryman chem dip then squirt it out with carb cleaner. Every orifice... I'm just not understanding why you'd have such problems with such a good carb :confused: :dunno: Last edited by spldart; 06-13-2015 at 06:26 PM.
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