Machine shops?
- Thread starter DeadPixel
- Start date
BTW this is for torque motor builds. Trail bike stuff. Around 9.0 compression and ratio rockers with stock Cam on one motor and cl1 high torque Cam on the other. Stock Cam has .650 carburetor with 25/24 jt head and cl1 Cam motor has ut1 GX160 head 18cc with 26/23mm valves and cheep 22mm carburetor. Stock Cam motor is a large bore 208 build and cl1 is a 212 clone build, not predator. Both heads lightly ported by my self.
here is what I am talking about on how a factory motor valve seat looks like and how the new heads that are bare look like. Top is bare head and bottom is new never ran head I pulled from a motor to inspect before its ran. You can see the seat not cut as deep on the bare head. The seat cut width is what I would expect on a head with a multi angle valve job. I have lapped them like this but its much harder to get them to seal. It might also be the crappy multi grit compound I am using too.
Ya that is why I went with the UT1 head. I am looking for a good flowing head at low lift and low RPM. A torque motor. The UT1 head I have has the 26mm intake and 23mm exhaust and a slightly smaller port than the 196 heads. I just finished up my cleaning of the ports. Rounded the short side radius and smoothed out the sharp edges on the sides and around the valve guides. My thought was the smaller port would have better port velocity and increasing the valve flow area would improve the low lift flow. Not sure if I am running ratio rockers with this one or not yet. Probably using the CL1 high torque cam though. This is the head I am using with the 212cc Clone parts I ordered the other day.
For now it looks like I am stuck just lapping valves my self. I was going to start buying the tools for stuff like this but I have a few motors and only one mini bike at the moment. Decided to buy a tube bender instead. One day I will get a multi angle valve seat cutter and a valve re-facer. I also want to get a truing hone and still need an inside dial boar gauge and micrometer set. Going to take me a few years to gather every thing I need. Just started down the path of mini bikes and go-karts a year ago. I have enough in to parts now that I could have bought 3 more minibikes hahaha. Now just need the proper tools to put the motors together the right way. I hate to check things like piston to wall clearance and install height with just a feeler gauge. Its not very accurate. I also don't have a way to check crank end play 
Think the next things I buy will be some tools for measuring. Think a Micrometer set is next on the list of stuff to buy. Maybe by this time next year I will be looking at getting the valve seat cutter.
Think the next things I buy will be some tools for measuring. Think a Micrometer set is next on the list of stuff to buy. Maybe by this time next year I will be looking at getting the valve seat cutter.Thanks but I just got to man up and buy the tools. I have too many of these motors worked on and I will have paid enough that I should have bought the tools. I have 4 heads that I want to machine, maybe 5 if I do my 420. Going to try lapping my valves in my UT1 head and see how sell that goes. Got some clover 600 grit on the way. I figure the valves will handle being re cut later down the road. I'm not doing any racing just trying to build a good running engine. I got a lot of tools I need to get. I am building motors but have not invested in proper blueprinting and machining equipment. Thanks for the offer though.
Yea my machinist has me ruined, he will mill a head for me for like $30
Yesterday he turned down a tapered crank shaft from 1" to 3/4 then broached a key way. $60
So anything I need he can do, usually does my stuff for free unless it's super time consuming because I hook him up with metal from my scrapyard.
Yesterday he turned down a tapered crank shaft from 1" to 3/4 then broached a key way. $60
So anything I need he can do, usually does my stuff for free unless it's super time consuming because I hook him up with metal from my scrapyard.
I almost went to school for machinist and if I would have thought about it more and know what I know now I would have. I was afraid of not getting a great paying job and took refrigeration instead. I am a very mechanical person too. I would have been fine but had just had a baby and did not want to mess around and took what I thought was the safe road.
Going back in 4 years to do a 2 year electrical program so I can eventually be a self contractor. Half my schooling was electrical so it's connected to my field. I want to do contract work some day for large buildings like stores and malls. I think machinist would be a lot funner but I am hoping I can afford to set up a shop easier doing the electrical.