tamarack
Member
Been a lurker for a while now absorbing all the info on the site prior to purchase and post purchase. Now to ask a question. I've seen similar issues listed before but not quite exactly the same as mine..as far as I can tell anyway....the details.
Purchased a 2007 in February with 5700 miles on it. I now have 6400 miles. Bike is stock. Here is what's happening. The number two cylinder, and sometimes the number 4 is missing. It happens the most often, and most severe when cold but also happens at any steady speed/RPM. It is more noticable at lower RPMs (4000 and below). It has been slowly getting worse. When dead cold for about the first 30 seconds to a minute I can hear either a “clunk” sound when it misses or it could possibly be a small “backfire” into the air cleaner. Not sure if it's either one of these but that's what it sounds like. Here is what I've done so far..mostly thanks to info gathered on this site.
1. I called Yamaha and they told me the ignition switch and ground wire recalls recalls were performed. But I'm not really sure to tell if this is true or not.
2. I've run two tanks of Sea Foam. (On the third) I did this because no telling how long it sat at the dealer, or the previous owners garage before I purchased. However I've noticed no change with the Sea Foam.
3. Changed the spark plugs. (The replaced plugs looked fine and no noticable difference between them)
4. Performed a TBS. All cylinders were in spec but I adjusted them to all equal.
I found out what cylinders where missing when the manometer was attached to throttle bodies. The number two cylinder would randomly but frequently (about every 30 seconds) go from 25 cm to 0 then back up to 25. The number 4 cylinder would do the same but only once to every 4 or 5 times of the number 2.
As mentioned it's getting slowly worse and starting to get to the point where I'm concerned I may be doing some real internal damage. Any thoughts, ideas and suggestions will be welcome. I really don't want to take it to the dealer.
I apologize if this is the same issue that's been discussed to death but from what I've seen before it hasn't been discussed, or I couldn't find a discussion dealing with a specific cyclinder. Just a “hesitation.”
Any reply's will be welcomed. Hopefully one day I will be able to contribute answers instead of questions.
Purchased a 2007 in February with 5700 miles on it. I now have 6400 miles. Bike is stock. Here is what's happening. The number two cylinder, and sometimes the number 4 is missing. It happens the most often, and most severe when cold but also happens at any steady speed/RPM. It is more noticable at lower RPMs (4000 and below). It has been slowly getting worse. When dead cold for about the first 30 seconds to a minute I can hear either a “clunk” sound when it misses or it could possibly be a small “backfire” into the air cleaner. Not sure if it's either one of these but that's what it sounds like. Here is what I've done so far..mostly thanks to info gathered on this site.
1. I called Yamaha and they told me the ignition switch and ground wire recalls recalls were performed. But I'm not really sure to tell if this is true or not.
2. I've run two tanks of Sea Foam. (On the third) I did this because no telling how long it sat at the dealer, or the previous owners garage before I purchased. However I've noticed no change with the Sea Foam.
3. Changed the spark plugs. (The replaced plugs looked fine and no noticable difference between them)
4. Performed a TBS. All cylinders were in spec but I adjusted them to all equal.
I found out what cylinders where missing when the manometer was attached to throttle bodies. The number two cylinder would randomly but frequently (about every 30 seconds) go from 25 cm to 0 then back up to 25. The number 4 cylinder would do the same but only once to every 4 or 5 times of the number 2.
As mentioned it's getting slowly worse and starting to get to the point where I'm concerned I may be doing some real internal damage. Any thoughts, ideas and suggestions will be welcome. I really don't want to take it to the dealer.
I apologize if this is the same issue that's been discussed to death but from what I've seen before it hasn't been discussed, or I couldn't find a discussion dealing with a specific cyclinder. Just a “hesitation.”
Any reply's will be welcomed. Hopefully one day I will be able to contribute answers instead of questions.
