Erbman02 (User)
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Re:We have a stumper..maybe need some input 4 Years, 8 Months ago
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SKWEARpeg wrote:
Erbman02 wrote:
ya got me confused by where the float is measured from, why measured from short tower? usually it's measured from mating surface. If anything, float is not adjusted right I would think.
sorry, but this is one mod I would never consider, ya want pumpless, go with a HSR carb. This carb was never meant to be pumpless, if it were, Mikuni would have made a float valve for this application. It might seem to work, but, I bet that there will be some situations of road condition, where it will plumb right fail. I'd rather know I could ride without a fuel issue on 100% of roads. The chances of pump failure is probably less than 1% when you take into account all the Roadies out there. But even then, a direct fuel run to the carb will usually allow you to limp home.
I know Erb, but it works.
The short tower, is the one in this tech piece... The nickles thickness down the tower, is for the 04 and later carbs(all carbs based on a tech memo from Yamaha)
http://weislake.com/sig/mucker/carb/carbfloat/carbfloat.htm
I had him snap a pic from the same angle, to make sure it was what it needed to be.
Thats all based on a stock carb, and fuel pump.
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Re:We have a stumper..maybe need some input 4 Years, 8 Months ago
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I agree with Erbman I never ran my OEM carb without the pump. I did relocate it and it stands to reason if you set the float the recommended setting and then go pumpless your fuel level will be low. The pump puts out fuel under pressure. No pump no pressure so you are going to feed fuel slower than the pump. Don't believe me try a timed dump with the pump running say 30 sec. then try the same 30 sec. dump without the pump and the bigger float needle. Raise the float level and you should be OK. Also that is why the HSR's you add the Yost power tube. The nut on the bottom acts like a reservoir that fills with fuel and keeps the head of the tube in the fuel no matter what, on curves, fast starts ect. It may be small but is enough to keep the head in a fuel puddle no matter what and with no splashing. |
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Warden (Moderator)
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Re:We have a stumper..maybe need some input 4 Years, 8 Months ago
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smokescreens wrote:
So you can rev it to your hearts content in neutral? Have you tried holding it at a higher rev in neutral to see if it pops and dies?
As far as the grizzly valve. Would install it to begin with. Best case of keeping the bowl full.
I can rev on the stand. But at higher RPMs it starts to pop.
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Re:We have a stumper..maybe need some input 4 Years, 8 Months ago
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Warden wrote:
SKWEARpeg wrote:
Warden wrote:
New stock carb had very similar results. Idle ok, but any attempt to ride would backfire and snort. I could "ease" it up to 2nd and 3rd gear, but ANY significant twist would cough and sputter.
Is it the same scenario???, idles and revs fine on the stand, but won't in gear? This stock carb, should be identical to the one you accidently drilled the wrong plug on, that resulted in you buying the one you rode to Kentucky, yes? The reason I ask, is I was surprised you could get the stock carb to handle it, with the pipes and Air kit you have on the bike.
The "original" carb was perhaps modded by the previous owner. What I miss drilled was not the PMS plug. That had already been removed which tells me it wasn't totally stock.
This carb (stock new this week) still has the PMS plug. It had similar results as my recent carb.
I didn't realize that the carb you miss drilled the plug on had been worked on(maybe). A bone stock carb, with your pipes and air intake, should have some issues. That's why I was asking if it was identical. Can you rev it on the stand like with the other one, and it revs fine, or does it cough and sputter as soon as you roll on the throttle on the side stand.
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Warden (Moderator)
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Re:We have a stumper..maybe need some input 4 Years, 8 Months ago
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SKWEARpeg wrote:
Warden wrote:
SKWEARpeg wrote:
Warden wrote:
New stock carb had very similar results. Idle ok, but any attempt to ride would backfire and snort. I could "ease" it up to 2nd and 3rd gear, but ANY significant twist would cough and sputter.
Is it the same scenario???, idles and revs fine on the stand, but won't in gear? This stock carb, should be identical to the one you accidently drilled the wrong plug on, that resulted in you buying the one you rode to Kentucky, yes? The reason I ask, is I was surprised you could get the stock carb to handle it, with the pipes and Air kit you have on the bike.
The "original" carb was perhaps modded by the previous owner. What I miss drilled was not the PMS plug. That had already been removed which tells me it wasn't totally stock.
This carb (stock new this week) still has the PMS plug. It had similar results as my recent carb.
I didn't realize that the carb you miss drilled the plug on had been worked on(maybe). A bone stock carb, with your pipes and air intake, should have some issues. That's why I was asking if it was identical. Can you rev it on the stand like with the other one, and it revs fine, or does it cough and sputter as soon as you roll on the throttle on the side stand.
Correct, at higher RPM in neutral it begins to Pop.
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Re:We have a stumper..maybe need some input 4 Years, 8 Months ago
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Erbman02 wrote:
SKWEARpeg wrote:
Erbman02 wrote:
ya got me confused by where the float is measured from, why measured from short tower? usually it's measured from mating surface. If anything, float is not adjusted right I would think.
sorry, but this is one mod I would never consider, ya want pumpless, go with a HSR carb. This carb was never meant to be pumpless, if it were, Mikuni would have made a float valve for this application. It might seem to work, but, I bet that there will be some situations of road condition, where it will plumb right fail. I'd rather know I could ride without a fuel issue on 100% of roads. The chances of pump failure is probably less than 1% when you take into account all the Roadies out there. But even then, a direct fuel run to the carb will usually allow you to limp home.
I know Erb, but it works.
The short tower, is the one in this tech piece... The nickles thickness down the tower, is for the 04 and later carbs(all carbs based on a tech memo from Yamaha)
http://weislake.com/sig/mucker/carb/carbfloat/carbfloat.htm
I had him snap a pic from the same angle, to make sure it was what it needed to be.
Thats all based on a stock carb, and fuel pump.
Yes, but both of mine with the grizzly valve, and set just like it, run just fine. I haven't been able to starve mine since I switched from the 2.5 suzi, to the 3.0 grizzly. I had to force it to make it starve with the suzi valve. He should be fine there, at least enough to pull onto the street.
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Re:We have a stumper..maybe need some input 4 Years, 8 Months ago
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Put the grizly valve in one and raise the level. See if that helps/hurts
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Re:We have a stumper..maybe need some input 4 Years, 8 Months ago
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Warden wrote:
smokescreens wrote:
So you can rev it to your hearts content in neutral? Have you tried holding it at a higher rev in neutral to see if it pops and dies?
As far as the grizzly valve. Would install it to begin with. Best case of keeping the bowl full.
I can rev on the stand. But at higher RPMs it starts to pop.
Whats higher rpms??? 2500, 3000, or 1250.
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Warden (Moderator)
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Posts: 9535
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Re:We have a stumper..maybe need some input 4 Years, 8 Months ago
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SKWEARpeg wrote:
Warden wrote:
smokescreens wrote:
So you can rev it to your hearts content in neutral? Have you tried holding it at a higher rev in neutral to see if it pops and dies?
As far as the grizzly valve. Would install it to begin with. Best case of keeping the bowl full.
I can rev on the stand. But at higher RPMs it starts to pop.
Whats higher rpms??? 2500, 3000, or 1250.
2500+
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pastornj (User)
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Posts: 3110
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Re:We have a stumper..maybe need some input 4 Years, 8 Months ago
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smokescreens wrote:
Put the grizly valve in one and raise the level. See if that helps/hurts
+1 - though it is sounding as though there is some other issue with fuel delivery - a line or filter problem
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