I am still deciding on what to do next. I am leaning towards getting a new sleeve, but want to do more research on all the different cylinder coatings. I am just not sold on them yet, but it may be quite a bit cheaper than having a new sleeve installed. Any inputs ARE appreciated too.
More bad news, I took the normal 350(Ol Dependable) out Saturday for some Walden dunes play action. By the end of the day, it was feeling just a little heavy or slugish. I attributed it to the heat of the day and jetting getting richer, 8500ft. Wrong. I came up out of a steep climb about 2 miles from camp and heard a pop then grinding sounds. I looked behind me, a nice trail of tranny oil full of sparklies. S.O.B., *^%#$@>*%$#!!!!!!!!!!!!!!!! Took one look, cracked both sides of the case. I have regularly beat this poor thing(like a red-headed step child) for better than 10 years with a fair amont of jumping too, before I knew it was bad for 350 trannies. I do however change my tranny fluid yearly with Mobile 1 and add extra to keep everything well covered. I just did my Spring change shortly before the big western ride(mabye 6 hours of riding there) and it just had the normal small amont of light shimmer in the draining. I have not touched it yet but will do some CSI with lots of pics later. Fed has my spare tranny in his 350, for now. I guess I can drop my 350 engine into the 420's frame, just to keep riding, being that it may be a while before the 420 gets finished. Fed and I now have a tranny each to rebuild. Maybe we can do a very detailed/pictures "how to"(or how not to) LOL, for the board members?
Remind me not to go to Vegas, my luck is sucking ass lately. LOL
Here some measurements I just took on the 420 jus and pistons. I am not sure what the areas I measured are supposed to be called so I named them as I went. Front to back(F/B) is intake to exhaust, and left to right(L/R) is transfer to transfer.
Cylinder is 88.55 top and 88.56 bottom. Bottom of the cylinder sleeve is 1.90MM on one side and 1.43mm on the other. (Not bored straight, slightly) If I am reading the piston to cylinder clearance right(and I am), I have better than 20 thousandths slop. The piston was an 88.5MM before. Really weird, never had a piston shrink. It was bored .0055 over piston size on the original rebuild.
In Millimeters
PISTON F/B L/R
top---------87.95---88.02
middle-----88.15---88.25
bottom-----88.30---N/A
Changes in thousandths of an inch
F/B L/R
Line above rings(top edge)------ 0 ------------------0
Top of compression area--------- 0 ------------------0
Middle of compression area------ +.5----------------0
bottom of compression area----- +1----------------- +.75
just above exhaust ports--------- + 3 ----------------+ 1.5
top of exhaust bridge------------- + 8 ----------------+ 1.5
middle of exhaust bridge--------- + 6 ----------------+ 1.5
just below bridge------------------ + 4 ----------------+ 1.5
Just below transfers--------------- + 2-----------------+1.5
bottom of sleeve------------------- + 2-----------------N/A
Do you think not having a balanced piston skirt could cause this? One side of the skirt has a port opening and not on the other.