Since this my first real post after introducing myself, I guess I'll share the details of my first project.
The bike is a 2007 Trek Navigator II. Oversized aluminum frame, very well built.
I believe Trek has them Manufactured in Taiwan now. The welding beads alone are a work of art.
Now, before I ordered the 69cc HT engine from Ebay (zippy-bike - seems to be a good seller), I took a lot of measurements to make sure this motor would fit in the v-frame. Oh Man! this is gonna be a tight squeeze!!
But I took a chance anyways.
I received the motor kit. Seems to be better in quality than what I expected. I place the motor in the frame.
Yep, It fits!!
Now for some of the mods I foresee.
I will have to use a short 45 degree elbow of some sorts to make the carb clear the seat tube. It will stick out the right side of the bike. I guess I can call it a side draft carb when it's finished.
Now the obvious other issue is the oversized tubes. The seat tube is 1 5/16 OD and the down tube is 1 1/2 OD and it's not round tubing. It's sort of pear shaped. I have to make custom motor mounts for it. The motor mounting design I have in mind should work well and be sturdy and it will involve rubber to absorb vibration. For now I will keep this secret until I test it. I will take pics of my progress along the way and show the results here.
But first I must follow the recommendations and valuable advice I found here in this forum :2thumbsup: on how to prep the HT motor (grade 5 bolts, nuts, washers, replace the wrist pin needle bearing with a Stihl needle bearing, better gaskets, lots of Locktite, etc.
So there it is, I have a lot of work ahead of me, but the result will be worth it.
Charlie
The bike is a 2007 Trek Navigator II. Oversized aluminum frame, very well built.
I believe Trek has them Manufactured in Taiwan now. The welding beads alone are a work of art.
Now, before I ordered the 69cc HT engine from Ebay (zippy-bike - seems to be a good seller), I took a lot of measurements to make sure this motor would fit in the v-frame. Oh Man! this is gonna be a tight squeeze!!
But I took a chance anyways.
I received the motor kit. Seems to be better in quality than what I expected. I place the motor in the frame.
Yep, It fits!!
Now for some of the mods I foresee.
I will have to use a short 45 degree elbow of some sorts to make the carb clear the seat tube. It will stick out the right side of the bike. I guess I can call it a side draft carb when it's finished.
Now the obvious other issue is the oversized tubes. The seat tube is 1 5/16 OD and the down tube is 1 1/2 OD and it's not round tubing. It's sort of pear shaped. I have to make custom motor mounts for it. The motor mounting design I have in mind should work well and be sturdy and it will involve rubber to absorb vibration. For now I will keep this secret until I test it. I will take pics of my progress along the way and show the results here.
But first I must follow the recommendations and valuable advice I found here in this forum :2thumbsup: on how to prep the HT motor (grade 5 bolts, nuts, washers, replace the wrist pin needle bearing with a Stihl needle bearing, better gaskets, lots of Locktite, etc.
So there it is, I have a lot of work ahead of me, but the result will be worth it.
Charlie
