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[drewcasci22]

Need some advice - I am having some problems which to me seem like an air lock, but I am not sure. The bike: 1994 KLR 650 w/ 40,000 KM IMS Tank - Installed 4 months ago Valves Adjusted 4 months ago - (adjusted by others, so don't know the clearances, but I have pretty good confidence in the shop)The guy who worked on it is a friend and had a KLR of his own in the past (now riding an africa twin). Symptom - started about 4 months ago: -At wide open throttle the bike starves for fuel and shuts down to an idle of about 1300 RPM and will cut out if you rev to 2000. -Has happened about 4 times in 4 months, but only when I really get on the throttle. -If I give it some choke it will run to about 3000 RPM and then give a cough, backfire and cut out again if I don't back off. -All of a sudden it will be back to normal if I let it sit for a while or play with the choke while rolling. -If I just ride passively to work and stay below 5000 RPM it runs like a champ and very smooth, good acceleration, etc. You would never know anything is wrong. Things I have checked: -Replaced the vacumme line from the petcock to the carb because it looked crimped in one place. -IMS Gas cap off to see if it was causing the airlock. -Cleaned air filter -Next step to take the carb apart, but I really do not want to go there if I don't have to. No time. If any of you have any ideas or insights, please let me know. I don't want it to cut out when I am in a dangerous situation like passing. I have never heard of the IMS gas tank causing this type of airlock. Need to keep riding, I don't have the patience to drive the car to work in the insane traffic. It takes double the time. Any help would be appreciated. Andrew Penang, Malaysia

[Oldrice]

Look for vacuum loss somewhere - intake manifold can rot and leak air starving the engine. Turning choke on can help but only until the motor cools and the leak stops again. The cracks may open when the engine warms up. When it's cooler does it run better? If that's not it, try changing the plug. Oldrice- www.oldrice.com/KLR650.htm

----- Original Message ----- From: "drewcasci22" To: DSN_KLR650@yahoogroups.com> Sent: Friday, August 24, 2007 9:35 PM Subject: [DSN_KLR650] Advice - Airlock? Need some advice - I am having some problems which to me seem like an air lock, but I am not sure. The bike: 1994 KLR 650 w/ 40,000 KM IMS Tank - Installed 4 months ago Valves Adjusted 4 months ago - (adjusted by others, so don't know the clearances, but I have pretty good confidence in the shop)The guy who worked on it is a friend and had a KLR of his own in the past (now riding an africa twin). Symptom - started about 4 months ago: -At wide open throttle the bike starves for fuel and shuts down to an idle of about 1300 RPM and will cut out if you rev to 2000. -Has happened about 4 times in 4 months, but only when I really get on the throttle. -If I give it some choke it will run to about 3000 RPM and then give a cough, backfire and cut out again if I don't back off. -All of a sudden it will be back to normal if I let it sit for a while or play with the choke while rolling. -If I just ride passively to work and stay below 5000 RPM it runs like a champ and very smooth, good acceleration, etc. You would never know anything is wrong. Things I have checked: -Replaced the vacumme line from the petcock to the carb because it looked crimped in one place. -IMS Gas cap off to see if it was causing the airlock. -Cleaned air filter -Next step to take the carb apart, but I really do not want to go there if I don't have to. No time. If any of you have any ideas or insights, please let me know. I don't want it to cut out when I am in a dangerous situation like passing. I have never heard of the IMS gas tank causing this type of airlock. Need to keep riding, I don't have the patience to drive the car to work in the insane traffic. It takes double the time. Any help would be appreciated. Andrew Penang, Malaysia List sponsored by Dual Sport News at: www.dualsportnews.com List FAQ courtesy of Chris Krok at: www.bigcee.com/klr650faq.html Member Map at: http://www.frappr.com/dsnklr650 Yahoo! Groups Links

[drewcasci22]

Oldrice (great name - like to hear the story sometime), Thanks for the tip. Will try and check for any leaks in the manifold, but it has happened with the engine cold and hot. This morning it was within the first 5 minutes of operation. I have changed the plug and it also looks like it is burning normal. I am open to all suggestions. Regards, Andrew

--- In DSN_KLR650@yahoogroups.com, "Oldrice" wrote: > > Look for vacuum loss somewhere - intake manifold can rot and leak air > starving the engine. Turning choke on can help but only until the motor > cools and the leak stops again. The cracks may open when the engine warms > up. When it's cooler does it run better? > > If that's not it, try changing the plug. > > Oldrice- > www.oldrice.com/KLR650.htm > > ----- Original Message ----- > From: "drewcasci22" > To: DSN_KLR650@yahoogroups.com> > Sent: Friday, August 24, 2007 9:35 PM > Subject: [DSN_KLR650] Advice - Airlock? > > > Need some advice - > > I am having some problems which to me seem like an air lock, but I > am not sure. > > The bike: > 1994 KLR 650 w/ 40,000 KM > IMS Tank - Installed 4 months ago > Valves Adjusted 4 months ago - (adjusted by others, so don't know > the clearances, but I have pretty good confidence in the shop)The > guy who worked on it is a friend and had a KLR of his own in the > past (now riding an africa twin). > > Symptom - started about 4 months ago: > -At wide open throttle the bike starves for fuel and shuts down to > an idle of about 1300 RPM and will cut out if you rev to 2000. > -Has happened about 4 times in 4 months, but only when I really get > on the throttle. > -If I give it some choke it will run to about 3000 RPM and then give > a cough, backfire and cut out again if I don't back off. > -All of a sudden it will be back to normal if I let it sit for a > while or play with the choke while rolling. > -If I just ride passively to work and stay below 5000 RPM it runs > like a champ and very smooth, good acceleration, etc. You would > never know anything is wrong. > > Things I have checked: > -Replaced the vacumme line from the petcock to the carb because it > looked crimped in one place. > -IMS Gas cap off to see if it was causing the airlock. > -Cleaned air filter > > -Next step to take the carb apart, but I really do not want to go > there if I don't have to. No time. > > If any of you have any ideas or insights, please let me know. I > don't want it to cut out when I am in a dangerous situation like > passing. I have never heard of the IMS gas tank causing this type of > airlock. > > Need to keep riding, I don't have the patience to drive the car to > work in the insane traffic. It takes double the time. > > Any help would be appreciated. > > Andrew > Penang, Malaysia > > > > > > List sponsored by Dual Sport News at: www.dualsportnews.com > List FAQ courtesy of Chris Krok at: www.bigcee.com/klr650faq.html > Member Map at: http://www.frappr.com/dsnklr650 > Yahoo! Groups Links >

[Jim]

Check the easy stuff first. Drain the float bowl and run some seafoam through it and in the fuel. Pull off the pink hose from the carb and blow compressed air through it. Check the rubber boots around your carb. Pull off and rebuild your petcock. Check your exhaust pipe gasket at the head. Keep us posted. --Jim

> Symptom - started about 4 months ago: > -At wide open throttle the bike starves for fuel and shuts down to > an idle of about 1300 RPM and will cut out if you rev to 2000. > -Has happened about 4 times in 4 months, but only when I really get > on the throttle. > -If I give it some choke it will run to about 3000 RPM and then give > a cough, backfire and cut out again if I don't back off. > -All of a sudden it will be back to normal if I let it sit for a > while or play with the choke while rolling. > -If I just ride passively to work and stay below 5000 RPM it runs > like a champ and very smooth, good acceleration, etc. You would > never know anything is wrong. > > Things I have checked: > -Replaced the vacumme line from the petcock to the carb because it > looked crimped in one place. > -IMS Gas cap off to see if it was causing the airlock. > -Cleaned air filter > > -Next step to take the carb apart, but I really do not want to go > there if I don't have to. No time. > > If any of you have any ideas or insights, please let me know. I > don't want it to cut out when I am in a dangerous situation like > passing. I have never heard of the IMS gas tank causing this type of > airlock. > > Need to keep riding, I don't have the patience to drive the car to > work in the insane traffic. It takes double the time. > > Any help would be appreciated. > > Andrew > Penang, Malaysia

[Norm Keller]

Just in case..... Jim said to blow air through the pink hose and NOT through the carburetor fitting from which the pink hose was pulled. If you put high pressure air to the carb fitting, it will run worse, if at all! Really bad news!!! Sorry to jump in, Jim. I've seen many disasters over the years from air hoses onto assembled carbs. Just concerned in case your advice was misread. Norm

>Check the easy stuff first. >Pull off the pink hose from the carb and blow >compressed air through it.

[Non-text portions of this message have been removed]

[Doug Herr]

On Sat, 10 Nov 2007, D Critchley wrote:

> I just checked the message file at Yahoo groups. There are no messages > past 09Nov07. Do they normally run 2 days late or is there a problem?

Here in the US pacific time zone, I see it as 10Nov07, so nothing seems too odd. Slow day for posting maybe, but not that rare. -- Doug Herr doug@... A16 in Oakland, California