slobanshee Posted June 28, 2014 Report Share Posted June 28, 2014 Picked up a cub top end. Was looking it over and noticed that it has a spacer plate? It's a 4 mil K&t cub that's a 69mm bore. It made good dyno numbers and runs great. But why the spacer? I did some measuring and the plate is the same thickness as the piston is taller when compared to a normal 68mm piston. Wrist pin to wrist pin. Did they run the spacer because they where forced to run that certain piston in the 69mm bore? The cyl is stamped 58. So it is a 4 mill cyl. Been calling K&t and havnt got ahold of them yet. So was hoping you guys could help me understand. Quote Link to comment Share on other sites More sharing options...
south street speed shop Posted June 28, 2014 Report Share Posted June 28, 2014 Slobanshee, take a caliper and measure the height of the cylinder, seen where people mill them for different reasons, what stroke crank is in it? maybe someone put a D. Wang 7 mil in it, theres a few 69mm bore pistons if you can get some numbers that would help or pics. A stk Banshee is 4.037 tall so a 4 mil would be .0787 taller and so on so start with the cylinder heigth and go from there, how thick is the spacer plate? and the gaskets?, they are .010, .013, .020 all different thickness, if you get all those dimensions we'll know exactly what's going on. Quote Link to comment Share on other sites More sharing options...
locogato11283 Posted June 28, 2014 Report Share Posted June 28, 2014 Hmm. Quote Link to comment Share on other sites More sharing options...
slobanshee Posted June 28, 2014 Author Report Share Posted June 28, 2014 The cyl measures at 4.080 total height in multiple places around it. Spacer with both gaskets is about .110 Thick. The plate only is about .050. Pistons don't look familier but have 10748m and 69.00 engraved on top. And also the batch number way off by itself. Quote Link to comment Share on other sites More sharing options...
slobanshee Posted June 28, 2014 Author Report Share Posted June 28, 2014 I looked the cp industries blueprints on thier page with the height measurements. All the bottom of the port measurements matched those numbers on their page. The heights and widths are different but I assume that's porting. I have a 10 mil K&t cyl here porting layout looks diff. But diff size motors I guess. Quote Link to comment Share on other sites More sharing options...
slobanshee Posted June 29, 2014 Author Report Share Posted June 29, 2014 Bump Quote Link to comment Share on other sites More sharing options...
shanYE west Posted June 29, 2014 Report Share Posted June 29, 2014 if it were me.. I would check timings and squish as it sits.. then I would take out the spacer to check timings and squish. That might give you some insight on what is going on in there. if you can't get ahold of K&T to explain it. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.