Good idea.Looking at the amount of some engine failures,seems this could have been missed before.
http://www.ekmpowershop2.com/ekmps/shop ... 6134-p.asp
New viton fuel tap
Good idea but whats the difference between the big bore ones with a similar looking plastic filter?
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soulsurfer
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I'd rather just upgrade the rubber washer but I guess there's no money in that 
Turn On, Tune In, Cop out!
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rosscla
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There seems to be conflicting opinions on whether Viton seals are or are not affected by so called 'modern fuels' - of which there seems to be no consistent formulation.
It does make sense that, if you believe the fuel may be attacking the rubber in your oil seals, that it may be attacking rubber bits elsewhere in the fuel system...
It does make sense that, if you believe the fuel may be attacking the rubber in your oil seals, that it may be attacking rubber bits elsewhere in the fuel system...
"Our dilemma is that we hate change and love it at the same time; what we really want is for things to remain the same but get better."
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warts
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From The DuPont site:
Viton® fluoroelastomer is the most specified fluoroelastomer, well known for its excellent (400°F/200°C) heat resistance. Viton® offers excellent resistance to aggressive fuels and chemicals and has worldwide ISO 9000 and ISO/TS 16949 registration.
We've developed many types of Viton® to meet specific end-use and processing needs. There are differences between types of Viton® in terms of chemical resistance and mechanical properties.
So now we know .... Of course, there may be viton recipes not approved by Dupont. Can't imagine many, say, Vietnamese feel a great loyalty to DuPont.
Or rather, how do we the punter, know squat? How can we tell one fluoroelastomer from an old tap washer?
Viton® fluoroelastomer is the most specified fluoroelastomer, well known for its excellent (400°F/200°C) heat resistance. Viton® offers excellent resistance to aggressive fuels and chemicals and has worldwide ISO 9000 and ISO/TS 16949 registration.
We've developed many types of Viton® to meet specific end-use and processing needs. There are differences between types of Viton® in terms of chemical resistance and mechanical properties.
So now we know .... Of course, there may be viton recipes not approved by Dupont. Can't imagine many, say, Vietnamese feel a great loyalty to DuPont.
Or rather, how do we the punter, know squat? How can we tell one fluoroelastomer from an old tap washer?
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rosscla
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That's marketing not evidence... 
There is obviously a problem with some fuel, the main problem is that we have no way of knowing which is which and it may even not be consistent at a single petrol station over time.
We know some unleaded contains more or less ethanol and some companies add their own additives to the base petroleum spirit, but it's all sold as unleaded.
There is obviously a problem with some fuel, the main problem is that we have no way of knowing which is which and it may even not be consistent at a single petrol station over time.
We know some unleaded contains more or less ethanol and some companies add their own additives to the base petroleum spirit, but it's all sold as unleaded.
"Our dilemma is that we hate change and love it at the same time; what we really want is for things to remain the same but get better."
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warts
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It may be "marketing" but do you know whether it is true or not? They are selling in to a very sophisticated market. Viton is after all, a generic name for a range of rubbery stuff, who knows if the correct one is specified?
The evidence is circumstantial because no one on any scooter forum I have looked at has talked about any scientific testing, just supposition and finger pointing, but where is the hard evidence?
On the other hand, there are multi-millions of other road vehicles running around using the same fuel as the rest of us.
Have a peek on any car forum, see if any of them are having problems with fuel degrading the multitude of seals and rubber bits of their carbs or injection systems. Not as far back as I can remember (not long I grant you!).
There was a lot of propaganda about potential problems with the rubbery bits in fuel systems when various %'s of ethanol were first in the offing. The mainstream ie cars and bikes, have sorted this. Do they have bit that could be used?
Vintage cars and bike often use straight alcohol fuel and they seem to manage. But then they often don't bother with trivialities like main jets - is that a clue? Because alcohol fuels have less calorific value, you need to dump more in to maintain the fire.
If an engine is borderline lean, then perhaps a small % change in fuel composition will be enough to tip it over the edge into catastrophic failure. And perhaps the whole system is marginal - it doesn't take much to tip the balance.
If it really is the seal in the tap, a round chunk with three holes in if memory serves, then perhaps someone could try something like PTFE, which is very inert.
The manufacture should not be all that technical.
Or hopefully this new one will be the biz?
The evidence is circumstantial because no one on any scooter forum I have looked at has talked about any scientific testing, just supposition and finger pointing, but where is the hard evidence?
On the other hand, there are multi-millions of other road vehicles running around using the same fuel as the rest of us.
Have a peek on any car forum, see if any of them are having problems with fuel degrading the multitude of seals and rubber bits of their carbs or injection systems. Not as far back as I can remember (not long I grant you!).
There was a lot of propaganda about potential problems with the rubbery bits in fuel systems when various %'s of ethanol were first in the offing. The mainstream ie cars and bikes, have sorted this. Do they have bit that could be used?
Vintage cars and bike often use straight alcohol fuel and they seem to manage. But then they often don't bother with trivialities like main jets - is that a clue? Because alcohol fuels have less calorific value, you need to dump more in to maintain the fire.
If an engine is borderline lean, then perhaps a small % change in fuel composition will be enough to tip it over the edge into catastrophic failure. And perhaps the whole system is marginal - it doesn't take much to tip the balance.
If it really is the seal in the tap, a round chunk with three holes in if memory serves, then perhaps someone could try something like PTFE, which is very inert.
The manufacture should not be all that technical.
Or hopefully this new one will be the biz?