Since you're changing out the crank couldn't the distance to the top of the cylinder change because the new crank could be longer or shorter by a couple of thousandths? And therefore the base gaskets needed to align the piston to the top of the cylinder could be different than before. Or is the crank measurements for replacement parts so exact the only the cylinder comes into play with the piston to cylinder alignment? With my experience every part has a tolerance and will therefore cause measurements to change. Also changing the piston out could also factor into the equation. Just want to hear what your experience has shown you. Another great video!!! Thanks for all the great information you give to us.
Hello. My experience owning Yamaha's... Since I set my squish band clearance on the head to a performance level I always recheck the squish band clearance when changing things like cranks, or cylinder, and sometimes pistons when I change to a different type of piston... With yamaha it doesnt seem to change. The cranks all measure the same, and so do the cylinders. Also pistons measure the same if using the same brand and type. But I'm not as sure with KTM so I will surely be double checking the cylinder base gasket size and if any corrects are needed I will do that. Especially because we will be going from a OEM piston to a wiseco. It could happen.
Wow, 35 hours and needed a crank??? Sorry if I missed it in the video, but do you know the history of this bike? Was it a built engine? Woods bike or fast moto guy? Sorry for all of the questions, but these bikes are on the short list for my sons next bike...
Hello. Yes it was a fast rider and they where running something like 60:1 for the premix. After the rebuild they started running 32:1. The rider was just too fast for such a lean oil ratio.
Right on. I'm really good at putting motors together with nothing getting in. This motor will be coming out completely and getting fully cleaned up before going back in so this one will surely be good.
@@UpAllNight91 its kind of a “hanging idle” but not a lean condition, you rev it and it pops as it slowly comes down(carb closed). Its annoying. Here is a vid i found here that has it. It’s been explained that it’s unburnt fuel in the pipe thats sucked back into the cylinder with the carb closed. th-cam.com/video/_-CZ9m-HoW0/w-d-xo.htmlsi=u17i_-GzzN17dmx1
@@UpAllNight91 I did, but have been getting this bike set up as I just got it. 2019 with just 7 hours on it. I even put on a keihin 38 hoping that would fix it. The mikuni had the bad mid body gasket and I heard they are sensitive to weather. I’m learning that the 17-19 250/300 suffered from this a lot. Annoying. Here’s actually my bike, I just did a quick vid of it now. I’ll keep digging…th-cam.com/users/shortsuPtuquU68Fs?si=mGm7yijZoEeZIYQD
@@mark_Hershey Based on the video I'm going to guess a combo of slightly higher idle and lower compression head. I have noticed the never YZ250's with the lower compression head can do that some and once I put a good race head on them it removes that all together. KTM's are kinda known to run a tighter squish but a lower compression ratio.
Thank you very much for helping me through my engine rebuild!
Right on! Glad to hear!
Great video🔥
Thanks!
Since you're changing out the crank couldn't the distance to the top of the cylinder change because the new crank could be longer or shorter by a couple of thousandths? And therefore the base gaskets needed to align the piston to the top of the cylinder could be different than before. Or is the crank measurements for replacement parts so exact the only the cylinder comes into play with the piston to cylinder alignment? With my experience every part has a tolerance and will therefore cause measurements to change. Also changing the piston out could also factor into the equation. Just want to hear what your experience has shown you. Another great video!!! Thanks for all the great information you give to us.
Hello. My experience owning Yamaha's... Since I set my squish band clearance on the head to a performance level I always recheck the squish band clearance when changing things like cranks, or cylinder, and sometimes pistons when I change to a different type of piston... With yamaha it doesnt seem to change. The cranks all measure the same, and so do the cylinders. Also pistons measure the same if using the same brand and type. But I'm not as sure with KTM so I will surely be double checking the cylinder base gasket size and if any corrects are needed I will do that. Especially because we will be going from a OEM piston to a wiseco. It could happen.
@@UpAllNight91 Thanks for replying and letting me know what your plans are. You're being very good about adjusting for tolerances.
@@joelatkinson2080 Yes sir, Thank!
Wow, 35 hours and needed a crank??? Sorry if I missed it in the video, but do you know the history of this bike? Was it a built engine? Woods bike or fast moto guy? Sorry for all of the questions, but these bikes are on the short list for my sons next bike...
Hello. Yes it was a fast rider and they where running something like 60:1 for the premix. After the rebuild they started running 32:1. The rider was just too fast for such a lean oil ratio.
Would like u to clean before u do majar work please dont like sand dirt in the motor still luv ya work😂
Right on. I'm really good at putting motors together with nothing getting in. This motor will be coming out completely and getting fully cleaned up before going back in so this one will surely be good.
Curious, have you ever dealt with pipe bang on the bigger ktm bikes? Very annoying.
Not sure I know what that is. Is that where it just pops inside the pipe?
@@UpAllNight91 its kind of a “hanging idle” but not a lean condition, you rev it and it pops as it slowly comes down(carb closed). Its annoying. Here is a vid i found here that has it. It’s been explained that it’s unburnt fuel in the pipe thats sucked back into the cylinder with the carb closed. th-cam.com/video/_-CZ9m-HoW0/w-d-xo.htmlsi=u17i_-GzzN17dmx1
@@mark_Hershey ahh I know what your tanking about now. Have you tried lowering the idle to as low as you can deal with?
@@UpAllNight91 I did, but have been getting this bike set up as I just got it. 2019 with just 7 hours on it. I even put on a keihin 38 hoping that would fix it. The mikuni had the bad mid body gasket and I heard they are sensitive to weather. I’m learning that the 17-19 250/300 suffered from this a lot. Annoying. Here’s actually my bike, I just did a quick vid of it now. I’ll keep digging…th-cam.com/users/shortsuPtuquU68Fs?si=mGm7yijZoEeZIYQD
@@mark_Hershey Based on the video I'm going to guess a combo of slightly higher idle and lower compression head. I have noticed the never YZ250's with the lower compression head can do that some and once I put a good race head on them it removes that all together. KTM's are kinda known to run a tighter squish but a lower compression ratio.