I am starting to get pissed. I don't know if everyone knows yet but I am building up a 350 Odyssey engine to a 420CC. Its a Leckich water cooled jug and head with an 88.5 MM ceramic coated Wiesco(YZ490) piston. I have a nice dust covered 102C and heel clickers, rebuilt driven with white spring, to put in her. I also just rebuilt the starter, pull start, ported and polished the jug, and have a big exhaust pipe for it. I put new seals in the bottom end too. I have several different reed cages(Vforce,Boysene rad w/ straight inlet,G-3,cr-4,6,8 petals) and carbs(34,36.5,38,39,40mm) to play with until I get the right combo.
Here is my problem, during the first leakdown test it had a bad leak into the coolant system. I could hear it. I Yamabonded the head gasket and it still leaked. I went out and got new O-rings(the old ones were Yama-nastied). Still leaks bad. OK, I did the glass/600 grit oiled sand paper redneck lap job. Looks great. Slapped it back together, pumped it back up to 7lbs, seems fine. Came back in 10 mins and its down to 3 lbs. I retorque the head down a little tighter, re pumped it back up and now I can hear the seep again in the coolant areas. :evil: I am not sure where to get more head gaskets. My head gasket "looks" OK. The CR480 dirt bikes used around a 88mm bore gasket with a 7 stud setup. Maybe the jug and head are slightly warped still? I can go back and remove more material(I didn't remove much before, just cleaned it up) but my squish band is already pretty close. Any suggestions? Punt? LOL
Gary