My klr acts like it's vapor locking - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

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post #1 of 65 Old 07-12-2014, 09:21 AM Thread Starter
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My klr acts like it's vapor locking

It seems that it's vapor locking my mileage on my tank is from about 170-220. Swich over to resrevs tank but makes no difrfence. Also I have opened my gas cap and it still makes no difference.
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post #2 of 65 Old 07-12-2014, 07:24 PM
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If opening the gas cap does not solve your problem, then it is not vacuum locking.

170 to 220 miles sounds like about what you should get from the top five gallons in the tank before reserve. Any chance you are turning the petcock selector to OFF instead of RES. It is easy to do because it seems natural to turn the long end of the selector handle to RES when actually you turn the tiny hard to see little arrow on the little end to RES. I have seen it happen twice.
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post #3 of 65 Old 07-12-2014, 11:45 PM
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No one but an idiot would turn the petcock the wrong way. In fact I'll recognize the idiot which turned mine the wrong way because I saw his face in my mirror while it was happening.

Apparently it's easy for some of us to do.....well...me anyway....

A friend showed me a petcock he had received which had plastic tubing over the fuel & reserve tubes to protect it in shipping. We wondered if anyone had installed a petcock without removing the tubing. That would diminish the flow rate and raise the level at which fuel stops flowing. I'd seen them that way for years but it hadn't occurred that someone might not remove the tubing.





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Originally Posted by GoMotor View Post
If opening the gas cap does not solve your problem, then it is not vacuum locking.

170 to 220 miles sounds like about what you should get from the top five gallons in the tank before reserve. Any chance you are turning the petcock selector to OFF instead of RES. It is easy to do because it seems natural to turn the long end of the selector handle to RES when actually you turn the tiny hard to see little arrow on the little end to RES. I have seen it happen twice.
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post #4 of 65 Old 07-12-2014, 11:58 PM
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Quote:
Originally Posted by Normk View Post
No one but an idiot would turn the petcock the wrong way. In fact I'll recognize the idiot which turned mine the wrong way because I saw his face in my mirror while it was happening.

Apparently it's easy for some of us to do.....well...me anyway....

A friend showed me a petcock he had received which had plastic tubing over the fuel & reserve tubes to protect it in shipping. We wondered if anyone had installed a petcock without removing the tubing. That would diminish the flow rate and raise the level at which fuel stops flowing. I'd seen them that way for years but it hadn't occurred that someone might not remove the tubing.
Norm, I don't even want to know why you use a mirror while setting the petcock selector, but I do want to point out that clocks, bolts and petcocks turn backwards in the mirror and that is what caused your problem.
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post #5 of 65 Old 07-13-2014, 01:01 AM
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That's why I post these experiences. I know you will explain them so that I can understand what happened.



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Norm, I don't even want to know why you use a mirror while setting the petcock selector, but I do want to point out that clocks, bolts and petcocks turn backwards in the mirror and that is what caused your problem.
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post #6 of 65 Old 07-13-2014, 04:47 AM
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I met with three other KLR-riding friends at Cycle Gear yesterday at noon, where we shopped for a while, then enjoyed the "daily special" at Tippy's Tacos next door.

When lunch was finished, three of us decided to go on a ride down Mason Neck, a peninsula extending into the Potomac River.

Geared up, I switched on my ignition and pressed the starter button. "Ugga-ugga; ka-chunk, die."

I pulled my custom "choke" knob to withdraw the starting enricher plunger on the other end of the shorty Harley choke cable: "Ugga-ugga; ka-chunk, die."

What the . . . ?????????????

Looking down at the petcock, I saw it had been turned to the OFF position! WHO did this, and WHEN? I had driven about 4 miles to the store from home, running fine, so I assume the deed was NOT perpetrated by an immediately local prankster. Could someone furtively have switched the valve on the bike in my parking space at home?

Another of history's unsolved mysteries!

Oh, nice ride, BTW! Bright, sunny day; not too hot for the season. We parked on a driveway next to a locked gate at a private boat-and-tennis club on the Potomac River, then walked to the water's edge for photos, including a 3-person "selfie." Managed to get kicked out, when an automobile carrying legitimate members honked, wanting to unlock the gate to gain entry!

Or, "HOW I SPENT MY SUMMER VACATION."

(Apologies for cluttering the website with irrelevant waste of bandwidth!)
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post #7 of 65 Old 07-13-2014, 12:50 PM
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I'm perhaps the worst "cluttering the bandwidth" offender but speaking for myself, I enjoy hearing what my friends offer as interesting, thought provoking, a smile, a lesson.....

I've learned more important lessons & information from unanticipated posts I think than from ones directly on the subject.

Glad you didn't have a problem because of that shut petcock. Making that quick pull out and merge only to have the engine quit could have been nasty.

Someone who would shut off someone's fuel in street riding environment would be on my bad list.






Quote:
Originally Posted by Damocles View Post
I met with three other KLR-riding friends at Cycle Gear yesterday at noon, where we shopped for a while, then enjoyed the "daily special" at Tippy's Tacos next door.

When lunch was finished, three of us decided to go on a ride down Mason Neck, a peninsula extending into the Potomac River.

Geared up, I switched on my ignition and pressed the starter button. "Ugga-ugga; ka-chunk, die."

I pulled my custom "choke" knob to withdraw the starting enricher plunger on the other end of the shorty Harley choke cable: "Ugga-ugga; ka-chunk, die."

What the . . . ?????????????

Looking down at the petcock, I saw it had been turned to the OFF position! WHO did this, and WHEN? I had driven about 4 miles to the store from home, running fine, so I assume the deed was NOT perpetrated by an immediately local prankster. Could someone furtively have switched the valve on the bike in my parking space at home?

Another of history's unsolved mysteries!

Oh, nice ride, BTW! Bright, sunny day; not too hot for the season. We parked on a driveway next to a locked gate at a private boat-and-tennis club on the Potomac River, then walked to the water's edge for photos, including a 3-person "selfie." Managed to get kicked out, when an automobile carrying legitimate members honked, wanting to unlock the gate to gain entry!

Or, "HOW I SPENT MY SUMMER VACATION."

(Apologies for cluttering the website with irrelevant waste of bandwidth!)
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post #8 of 65 Old 07-15-2014, 03:06 PM Thread Starter
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Well i get alot of air pressure when i open cap! Made sure its on reserve only happens when hot out!
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post #9 of 65 Old 07-15-2014, 03:52 PM
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The first thought that comes to mind is that the gas in the tank has dropped below the main pickup tube level and the reserve pickup tube has a clogged screen.

If it were mine, I would make sure there is at least two gallons in the tank. Then remove the fuel line from the petcock and install a clear plastic line from the petcock to a catch bucket. With the petcock set to ON press the start switch and crank the engine over three or four seconds to confirm that gas comes out then set the petcock to RESERVE and do the same. If no gas flows on RESERVE, the reserve pickup screen or the reserve side of the petcock is clogged.
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post #10 of 65 Old 07-15-2014, 04:26 PM
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+ 1!

"Vapor locking" requires LOTS of heat; 220 miles seems plausible as mileage to reserve; forward-pointing fuel lever and no fuel could definitely be clogged reserve standpipe within tank.
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