For the third time I am working on the 49cc billet alum cased engine. Still has a few problems with the case halves matching right, CAM2 knows all about this engine, lol. I split the cases, removed the crank, inspected everything. When you hold them together at the reed intake area, there is a small gap most of the way around the rounded part of the case. They did not machine the halve where they mate, there not flat.
So, the plan is to use my new tube of #4 Yamabond to fill the gaps, and maybe some .015" gasket material if needed.
They also machined the main bearing holes to deep, so the crank ends were rubbing the side of the cases inside. So, I put four .004" Zenoah 15mm ID crank shims, 4 on each side to stop.
Need to keep the case halves as close together as possible cause the main trans case port are really wide, very little sealing area at the base of the cyld, plus some other small problems
Going put a new head, blue billet winged head on this time. Here are some photos the last time I put it together.
So, the plan is to use my new tube of #4 Yamabond to fill the gaps, and maybe some .015" gasket material if needed.
They also machined the main bearing holes to deep, so the crank ends were rubbing the side of the cases inside. So, I put four .004" Zenoah 15mm ID crank shims, 4 on each side to stop.
Need to keep the case halves as close together as possible cause the main trans case port are really wide, very little sealing area at the base of the cyld, plus some other small problems
Going put a new head, blue billet winged head on this time. Here are some photos the last time I put it together.