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Post by kernow on Dec 5, 2019 14:17:05 GMT 1
Having had issues with YPVS 350 flooding I have swapped out the vacuum tap to a conventional gravity type from a 350R. Now as I have recently bought Yamaha R1-Z with a vacuum fuel tap I want to swap that for a gravity type. I,m hoping it should be a little easier as there is no body work to contend with. Would anyone know which taps would fit, there are LC 350 and RD 400 copies on ebay for little money although the quality word springs to mind.
Thanks Bry
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Post by midlifecrisisrd on Dec 5, 2019 14:40:33 GMT 1
If they are made by tourmax they are fine
Steve
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Post by earthman on Dec 5, 2019 14:48:38 GMT 1
I don't understand why you would want to go back to a gravity fed tap especially if you are having carb flooding issues?
Surely that's the whole idea of a vacuum type tap, the fuel won't pi$$ out when the engine stops running.
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Post by marsbar350 on Dec 5, 2019 15:41:31 GMT 1
ive got a single 8mm lc type tap on my F2 hybrid works a treat and locates in the same place as the original through the side panel had to shave a bit off the airbox to fit better well worth the effort had mine off norbo his TZ type tap
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Post by foxyjohn on Dec 5, 2019 15:45:20 GMT 1
I am using a Tourmax 350 lc tap on my R1-Z you just need to make new fuel pipes
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Post by tacky1 on Dec 5, 2019 15:57:45 GMT 1
Sounds like float heights or needles are worn. It shouldn’t piss fuel
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Post by rigga on Dec 5, 2019 18:46:16 GMT 1
Associated question about taps ..... should a single outlet flow as much fuel as a twin? Going from a twin pipe, one to each Carb, then to a single outlet with changed pipework to suit, would there be any possible fuel starvation issues? Is a high flow tap desirable?
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Post by pdxjim on Dec 5, 2019 19:18:22 GMT 1
... and while were at it ...
Is there a more modern dual (or single) outlet tap that'll fit the LC tank?
Have heard the 650 Raptor (quad) tap fits the 400 and flows more, but dunno if it is the same mount as the LC.
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Post by marsbar350 on Dec 5, 2019 19:46:28 GMT 1
Associated question about taps ..... should a single outlet flow as much fuel as a twin? Going from a twin pipe, one to each Carb, then to a single outlet with changed pipework to suit, would there be any possible fuel starvation issues? Is a high flow tap desirable? measured the 8mm 1.5 litres per min one pipe outlet then split into both carbs
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Post by midlifecrisisrd on Dec 5, 2019 19:58:57 GMT 1
By my quick mental arithmetic to use a litre and a half in a minute you'd have to be getting 3.5 mpg at 120mph
Steve
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Post by stusco on Dec 5, 2019 20:24:05 GMT 1
Associated question about taps ..... should a single outlet flow as much fuel as a twin? Going from a twin pipe, one to each Carb, then to a single outlet with changed pipework to suit, would there be any possible fuel starvation issues? Is a high flow tap desirable? I’ve got a Pingle high flow tap but they are expensive but what isn’t for a lc
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Post by midlifecrisisrd on Dec 5, 2019 21:54:03 GMT 1
Associated question about taps ..... should a single outlet flow as much fuel as a twin? Going from a twin pipe, one to each Carb, then to a single outlet with changed pipework to suit, would there be any possible fuel starvation issues? Is a high flow tap desirable? I’ve got a Pingle high flow tap but they are expensive but what isn’t for a lc Try buying the triple outlet one 😱 Steve
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Post by midlifecrisisrd on Dec 5, 2019 22:09:15 GMT 1
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Post by rigga on Dec 5, 2019 23:47:21 GMT 1
Reason why I asked, last ride before winter I changed my duel outlet which had gone very stiff to turn on and off, to a single outlet, and pretty sure I had fuel starvation symptoms, almost felt I was running out of fuel at one point Might change it back to a double, or try one of Norbo's high flow single if that will flow enough?
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Post by kernow on Dec 6, 2019 12:29:42 GMT 1
Thanks for all the feedback, what a wonderful forum this is, with kudos to the people who run and maintain it. It does look to me at least that the flooding, in my case the left cylinder, is not uncommon mine was only left for 2 weeks without starting. Is that why Yamaha went back to a gravity fed fap on the latter YPVS models. I have never had an issue with gravity taps when leaving / laying up, I have only filled the tank, emptied the carbs job done. I shall look for a Tourmax 350 LC tap, thanks again.
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Post by veg on Dec 6, 2019 12:37:29 GMT 1
Got Norbos hi flow tap and I run 34mm carbs
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Post by JonW on Dec 6, 2019 12:41:41 GMT 1
Got Norbos hi flow tap and I run 34mm carbs Me too Veg. Its the TZ unit i think?
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Post by veg on Dec 6, 2019 12:42:38 GMT 1
It is, the only difference apart from being higher flow is the outlet faces the opposite way.
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Post by Tobyjugs on Dec 6, 2019 14:13:20 GMT 1
I think somebody on this forum mentioned using a fuel tap of either an R6 or an R1
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Post by rigga on Dec 6, 2019 19:43:11 GMT 1
Got Norbos hi flow tap and I run 34mm carbs Good enough for me, cheers veg
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Post by earthman on Dec 6, 2019 20:30:56 GMT 1
Thanks for all the feedback, what a wonderful forum this is, with kudos to the people who run and maintain it. It does look to me at least that the flooding, in my case the left cylinder, is not uncommon mine was only left for 2 weeks without starting. Is that why Yamaha went back to a gravity fed fap on the latter YPVS models. I have never had an issue with gravity taps when leaving / laying up, I have only filled the tank, emptied the carbs job done. I shall look for a Tourmax 350 LC tap, thanks again. I really don't know about the YPVS models, are you sure that they went back to a gravity fed tap?? I'd be surprised, that really doesn't make sense to me, surely the vacuum type of tap is the best way to go?....I wish that my 4LO had one, save me having to turn it to the off position every time I park it up.
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Post by alankelly on Dec 6, 2019 20:40:25 GMT 1
Thanks for all the feedback, what a wonderful forum this is, with kudos to the people who run and maintain it. It does look to me at least that the flooding, in my case the left cylinder, is not uncommon mine was only left for 2 weeks without starting. Is that why Yamaha went back to a gravity fed fap on the latter YPVS models. I have never had an issue with gravity taps when leaving / laying up, I have only filled the tank, emptied the carbs job done. I shall look for a Tourmax 350 LC tap, thanks again. I really don't know about the YPVS models, are you sure that they went back to a gravity fed tap?? I'd be surprised, that really doesn't make sense to me, surely the vacuum type of tap is the best way to go?....I wish that my 4LO had one, save me having to turn it to the off position every time I park it up. Hi Got this fitted to my 4L0 Not sure what it is off but it came with a box of bits☹️ And as I have 31k carbs vacuum pick up is easy To be honest can anybody identify this tap please as want to replace the diaphragm but the Rd ones look a different shape? The diaphragm is square rather than house shape Best wishes Al
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337lma
Weekend rider
Posts: 84
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Post by 337lma on Dec 6, 2019 22:21:48 GMT 1
Thanks for all the feedback, what a wonderful forum this is, with kudos to the people who run and maintain it. It does look to me at least that the flooding, in my case the left cylinder, is not uncommon mine was only left for 2 weeks without starting. Is that why Yamaha went back to a gravity fed fap on the latter YPVS models. I have never had an issue with gravity taps when leaving / laying up, I have only filled the tank, emptied the carbs job done. I shall look for a Tourmax 350 LC tap, thanks again. I really don't know about the YPVS models, are you sure that they went back to a gravity fed tap?? I'd be surprised, that really doesn't make sense to me, surely the vacuum type of tap is the best way to go?....I wish that my 4LO had one, save me having to turn it to the off position every time I park it up.
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337lma
Weekend rider
Posts: 84
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Post by 337lma on Dec 6, 2019 22:23:33 GMT 1
The R model YPVS has a gravity fed fuel tap. I think the later model of F2 is also the same
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Post by 84rzrider on Dec 7, 2019 4:04:04 GMT 1
I converted mine to a RD400 petc**k. I used a turned down Allen head bolt and mated it to the factory knob. Works like a champ and looks factory.
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Post by kernow on Dec 7, 2019 20:40:03 GMT 1
The R model YPVS has a gravity fed fuel tap. I think the later model of F2 is also the same Yep I used an R tap
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