|Topic Review (Newest First)|
|03-20-2019 09:55 PM|
|Jettn Jim||I also prefer a manual petcock and have ran one for over 70,000 miles. It's a custom Yamaha configuration I played with back in 2011.|
|03-20-2019 09:53 PM|
I put in Star Brite StarTron and fire the girls up when I get a chance. No problems with the bikes and their fuel for years.
Without it... it's a carb cleaning after a couple months sitting with these ethanol fuels.
It's the best fuel additive going.
|03-19-2019 10:14 AM|
Yes, I'm aware that it's an EPA thing......yet another compromise unfortunately. regarding the vacuum petcock; I'm aware of both your opinion and your luck with the stock petcock but as you know, petcock failure is an exceedingly common problem - you don't have to spend too many years on these forums to see that....and, of course, EM wouldn't have a market for the manual ones if people weren't interested in swapping. I'd suggest that ethanol is far more of a problem if a bike sits for any period of time - if run regularly, it appears to be fine according to many (yourself and GoMotor for eg.)
I may try to source a bowl with the stand pipe as I believe that's the ultimate insurance.
|03-18-2019 08:10 PM|
Originally Posted by DPelletier View Post
The carburetor and intake port are angled slightly forward. Slightly over-flowing fuel will tend to seep out thru the pilot mixture screw and the 3 low speed pilot outlets under the edge of the throttle plate before it seeps out of the pilot air or main air jets in the throat of the intake bell mouth of the carb.
Even setting on a center stand, I believe the carb is angled 'down-hill'.
In 32 years of dealing with KLR650 vacuum operated fuel taps, I have Never seen any parts of the fuel tap vacuum diaphragm or its sealing o-ring jammed in the carburetor float needle.
I have seen plenty of crumbs from the selector discs. Even more crumbs from the selector discs used on the manual fuel taps of the seasonally used ATV's.
There is currently only one fuel station in this town which sells a non-ethanol #91 premium priced, premium grade fuel. So even I have used many hundreds of gallons of ethanol laced #87 gasoline thru my personal KLR650 in the past 20 years.
It is a mystery to me how that 'tiny little duck-bill screen fuel filter' in the 2011 & up permanent fuel inlet nipples can flow enough fuel to allow 35-40 mpg at 90 mph in a head wind and some of the larger in-line fuel filters might not!
Mark Gardiner & Ian Hopkin on one or two of the KLR FB groups said that the KLR600, 650-A & 650-C models in the UK had overflow stand pipes in the float bowls.
|03-18-2019 04:58 PM|
Originally Posted by DPelletier View Post
|03-18-2019 04:57 PM|
I much prefer an accurate fuel gauge to the reserve petcock, but I can live with either.
|03-18-2019 03:12 PM|
It's a matter of risk managment IMO. In order to dump fuel into the engine, you need to forget to turn a manual petcock on and off and you need a float valve problem. (If Kawi had put a proper overflow tube in place, it'd be a non-issue). I'm also not sure that the bike will drain fuel into the cylinder unless it's sitting just right. The flip side is that the vacuum petcock isn't ethanol compatible and is a fairly regular failure point - even Kawi added the little filter at the carb, presumeably to address this......though just making a new, ethanol proof diaphragm would seem to be a better fix. I see the possibility of hydrolocking the cyl with fuel but I doubt it's a common thing.
Seeing as how the vast majority of my 41 bikes have had manual petcocks, I've become pretty accustomed to turning them on and off as necessary and believe that the Yamaha petcock replacement has simplified and improved my KLR's......combined with my IMS tank (and gas cap), I believe I've eliminated several of the common KLR problem areas.
Paul, you mentioned once a CVK float bowl that has the overflow tube in it; retrofitting that might add staples to the belt and suspenders!
|03-18-2019 02:59 PM|
|03-18-2019 02:57 PM|
Originally Posted by Damocles View Post
|03-18-2019 02:23 PM|
Originally Posted by Voyager View Post
I think the "PRIME" positions on fuel systems so configured merely provide raw fuel to the carburetor venturi when activated; absent the greater finesse of the KLR's starting enricher, a component mixing BOTH air and fuel, as described in pictures and text above. I'd imagine a combustible mixture upon starting more likely from the KLR starting enricher, than from a prime-type system in that position.
Maybe not. Maybe my perception is never fulfilled, or only sometimes valid.
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