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| Another '79 CR250 question https://vintagedirtbikeforums.alp-sys.com/viewtopic.php?f=21&t=2077 |
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| Author: | dogger315 [ Wed Nov 12, 2008 11:11 am ] |
| Post subject: | Another '79 CR250 question |
I am finishing up the plating on my '79 CR250 resto and I have yet another question about the original finish. Does anyone know what the original finish was on the kickstarter knuckle? I don't remember from back in the day and from the pictures I see of the bikes now, it just looks discolored compared to the kickstart arm. The part I have now is in good mechanical shape and while the finish is used up, it has what looks like a little gold coloring to it. I am wondering if the knuckle was originally gold CAD plated like so many other components on the bike. Any of you '79 experts know definitively? Thanks for any input. dogger |
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| Author: | redrocket190 [ Wed Nov 12, 2008 12:25 pm ] |
| Post subject: | Re: Another '79 CR250 question |
I put a NOS one on my bike. It was the same finish as the kick starter i.e. starts out fairly bright but dulls quickly. I would polish both parts to slightly less than high gloss. The pin is chrome plated. |
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| Author: | dogger315 [ Thu Nov 13, 2008 8:15 pm ] |
| Post subject: | Re: Another '79 CR250 question |
Thanks Michael. I'll clean up the knuckle and clear (silver) CAD plate it and have the pin re-chromed. Speaking of chrome, I need to have the kickstarter for my '73 chrome plated again. I ruined the finish when I had to fill weld then redrill the pin hole in that knuckle and lever to get rid of the "floppy lever" syndrome. Since the local chromer charges by the job, I might as well take in a batch of work. dogger |
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| Author: | badsix [ Fri Nov 14, 2008 8:51 pm ] |
| Post subject: | Re: Another '79 CR250 question |
dogger,about your engine cases do you do your own powder coating. i was wondering how you masked it so good. i took my harley case to our only local powder coater and the job looked horrable. i really do'nt want to take my 125 cases there unless i mask them my self . i have been thinking about getting my own powder coating set up maybe i will just wait. i have been in the auto painting business for 25 years i may spray the cases with urathane and hi temp rattle can the cyl. and head. i need to get this thing done i have to many projects going. allso do you have a trick way to get the studs that hold the cyl. to the case out. there really in there i would hate to break one off. do you know if new ones are available thanks jay d |
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| Author: | dogger315 [ Sat Nov 15, 2008 11:49 am ] |
| Post subject: | Re: Another '79 CR250 question |
Jay, I know what you mean about less-than-good work done by so called professionals. I can count on one hand the number of shops I have sourced work to that returned a good job. That is what motivated me to learn how to do these things and then invest in the equipment to do it myself. I do all of my own powdercoating. I started out with an Eastwood hobby gun kit and a used oven I bought from an appliance store. I learned most through trial and error and managed to get a pretty good grip on the basics. As my work improved, my neighbors and friends started showing up with more and more work which helped fund my Eastwood Pro gun and 64 cu ft oven which is enough for me to do anything bike related. As for masking your cases. I decided early on I wanted to paint the inside with glyptal paint to seal the castings and promote better oil flow. This turned out to be a big pain-in-the-butt. I masked every gasket surface, every bearing boss, every surface that needed to stay bare. This was time consuming, tedious work (several hours per case). Once I had the inside painted, I removed all the tape from the inside surfaces and assembled the case halves, clutch cover, ignition cover and powder coated. This insured I'd have good clean gasket surfaces and minimal to no powder overspray. Once everything was cured, I took a razor and cut the coating at the case center, cutch and ignition covers and took everything back apart. I powder coated the cylinder and head seperately. If you don't paint the inside of your cases, the job would be fairly simple. Bolt the bottom together making sure you mask off the cylinder mounting flange amd plugging all holes, then powder coat. As for the cylinder studs. What works best for me is to spray some penetrant (I use Liquid Wrench) in the wells around the studs and let sit overnight. Place the case in an oven at 250-300 degrees for half an hour. Remove the case and thread on a couple of flange nuts with the flanges up against each other on each stud and tighten securely. Make sure to leave a box wrench on the stud below the bottom flange nut before you tighten because an open end wrench will almost certainly round off the flange nut. The heat causes the aluminum case to expand at a higher rate than the steal stud. Use the box wrench to remove the stud. One word of caution. These bolts are 30 years old so treat them accordingly. I would use a mallet to wack the box wrench a couple of times to break it lose. If that doesn't work, leave them in and work around them if they are in otherwise good shape. Same goes for the cylinder head studs. Neither is still available from Honda. If you have any questions, feel free to ask. Hope this helps. dogger |
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| Author: | badsix [ Sat Nov 15, 2008 2:19 pm ] |
| Post subject: | Re: Another '79 CR250 question |
dogger, you are right if you want a good job you probably need to do it yourself. i have been reading a lot on the caswell site powdercoating fourm, lots of very good info. there. if you hav'nt been there take a look. i will try the stud thing soaking for a few days thanks jay |
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