You're welcome, and thanks for the comments. Good luck with your H2... I have a '73 H2A also, there's a video or two on my channel regarding this project.
Good evening Mr. Kwrightway, Larry here new subscriber. I own the same bike 73 F11 250 my bike also smokes abnormally. I'm not sure not a 2stroke technician but I believe the Left crank seal or seals are bad. Let me know what you find out on yours asap. Thanks.
@@LarryJohnson-tc7xc There can be a number of reasons for excess smoking; type of oil being used, oil pump & carburetor adjustment, to a bad seal. First question, what does the spark plug look like? This may help with issue diagnoses. If the spark plug doesn't direct you, work from simplest to most complex... make sure the oil pump is adjusted correctly, then make sure the carburetor is adjusted. Many folks jump right to bad crank seal(s), but in my experience it's not as common as some would lead one to believe. Sure it happens on these old bikes, especially if they've been sitting unused for long periods of time but it's not the first thing I think of. The F11 has one seal on the left end of the crank, one on the right side. There's a test to determine is the lower end is holding pressure, it's called a "leak down" test and requires rigging up test equipment and following a specific procedure. I'm sure there's TH-cam videos on this, though I haven't produced one. As I indicated at the end of the video, I'm going to check the carb on my F11 for adjustment and that's about it at this time. If the carburetor isn't the issue, I'm going to live with the smoking for now and come back to it later.
Ehhhck. Just got an F11 and this very line is leaking. nothing $150 wouldn't fix. someone had put some sort of shrink tube over the bad spot....so I don't know. Thanks for the video.
I've encoutnered leaking oil feed lines on a number of projects over the years, and have never had any luck at making a permanent repair (certainly not heat shrink tubing). I've tried different adhesives, sealants, plastic welding, etc., and though the repair might appear to work initially, they inevitabley failed. I now jump right to replacing the line. Perhaps someone out there has come up with an effective, long-term solution but it's not me. Good luck...
@@kwrightway Thanks for the reply. In taking the repair apart, it was actually some tubing that swelled, that had been over it. For now, I have a piece of polyurethane tubing from the nipple on the banjo and then over the original line about 1/2 an inch. I used safety wire on both ends to crimp it on. This should at least get me to where I can iron the rest of the bugs out of it, I will search for a better solution or else try and buy one.
thank you for this awesome educational video. i dont know much and i just bought a yamaha dt100 enduro and i was thinking of doing the premix insted but do you think that maybe i can just drain the oil pump container to stop it from pumping right ?or do i have to disconnect the line or cable too?thank you so much......
Why do you want to not use the oil injection? I've worked on litteraly hundreds of these bikes of all the major Japanese brands and I've never personally seen a two-stroke oil pump fail. Leak yes, actually fail and not pump oil, never. In any event, what's considered the appropirate way to disconnect the oil system is to remove the pump, and fabricate an oil-tight means to block off the pump mounting flange. Otherwise, the pump will keep pumping with no oil flow, which will eventually destory it. Personally on a vintage DT100, I'd leave it alone. Even if the pump is giving you issues, I'd replace it before disconnecting it.
I have to bleed the oil pump on my H2 tomorrow. I was leaking trans oil through the tach gear. Enjoyed watching this for the helpful tips and tricks
You're welcome, and thanks for the comments. Good luck with your H2... I have a '73 H2A also, there's a video or two on my channel regarding this project.
Good evening Mr. Kwrightway, Larry here new subscriber. I own the same bike 73 F11 250 my bike also smokes abnormally. I'm not sure not a 2stroke technician but I believe the Left crank seal or seals are bad. Let me know what you find out on yours asap. Thanks.
@@LarryJohnson-tc7xc There can be a number of reasons for excess smoking; type of oil being used, oil pump & carburetor adjustment, to a bad seal. First question, what does the spark plug look like? This may help with issue diagnoses.
If the spark plug doesn't direct you, work from simplest to most complex... make sure the oil pump is adjusted correctly, then make sure the carburetor is adjusted.
Many folks jump right to bad crank seal(s), but in my experience it's not as common as some would lead one to believe. Sure it happens on these old bikes, especially if they've been sitting unused for long periods of time but it's not the first thing I think of. The F11 has one seal on the left end of the crank, one on the right side. There's a test to determine is the lower end is holding pressure, it's called a "leak down" test and requires rigging up test equipment and following a specific procedure. I'm sure there's TH-cam videos on this, though I haven't produced one.
As I indicated at the end of the video, I'm going to check the carb on my F11 for adjustment and that's about it at this time. If the carburetor isn't the issue, I'm going to live with the smoking for now and come back to it later.
thanks for the good advice
Ehhhck. Just got an F11 and this very line is leaking. nothing $150 wouldn't fix. someone had put some sort of shrink tube over the bad spot....so I don't know. Thanks for the video.
I've encoutnered leaking oil feed lines on a number of projects over the years, and have never had any luck at making a permanent repair (certainly not heat shrink tubing). I've tried different adhesives, sealants, plastic welding, etc., and though the repair might appear to work initially, they inevitabley failed. I now jump right to replacing the line. Perhaps someone out there has come up with an effective, long-term solution but it's not me. Good luck...
@@kwrightway Thanks for the reply. In taking the repair apart, it was actually some tubing that swelled, that had been over it. For now, I have a piece of polyurethane tubing from the nipple on the banjo and then over the original line about 1/2 an inch. I used safety wire on both ends to crimp it on. This should at least get me to where I can iron the rest of the bugs out of it, I will search for a better solution or else try and buy one.
Seems really familiar, mine broke exactly same way. New one was not available, so I made new banjo fitting from steel.
thank you for this awesome educational video. i dont know much and i just bought a yamaha dt100 enduro and i was thinking of doing the premix insted but do you think that maybe i can just drain the oil pump container to stop it from pumping right ?or do i have to disconnect the line or cable too?thank you so much......
Why do you want to not use the oil injection? I've worked on litteraly hundreds of these bikes of all the major Japanese brands and I've never personally seen a two-stroke oil pump fail. Leak yes, actually fail and not pump oil, never.
In any event, what's considered the appropirate way to disconnect the oil system is to remove the pump, and fabricate an oil-tight means to block off the pump mounting flange. Otherwise, the pump will keep pumping with no oil flow, which will eventually destory it.
Personally on a vintage DT100, I'd leave it alone. Even if the pump is giving you issues, I'd replace it before disconnecting it.