I was thinking of a few cases on this site of guys getting just what they asked for, the APE crank welding comes to mind. I would rather go to a builder who would tell me flat out that I was full of sht and that they would not bid the job. They are the experts and I consider this part of what I am paying them for.
Lets see, I want an ultra reliable bike engine but make it out of 25 year old used parts so I can save some $$$, then warranty your work for 25,000 miles. Seems like your rep as a builder is on the line. The better the rep, the more risk in cutting corners. If the motor blows, next thing you know he is posting on GSR about the a crappy motor you built. To him he was getting some race motor with those G blah blah cams and couldn't understand why when he beat the **** out of it that it let go after the first 2000 miles. Then we all get to jump in the fun again. LOL
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It's hard enough working on old bikes and finding parts without dealing with BS like this. What a shame. Deadbeat isn't half of it.

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