superjet 701 motor advise please......HELP.. =(

[seadookid84]

so i bought my superjet 2 months ago and still havn't gotten it into the water. boat has been in salt water all it's life so it's rough. pulled motor apart, had pretty good comp but i wanted to know for sure. cylinders looked fine, no bad scaring. guy i know ported the crank case . he says they are called "finger ports" ??? he also cleaned up the transfers and exhaust. the owner of the shop says my crank needs replaced, due to the rods feeling kind of rough when you spin them...also he wants me to boar the cylinders...we honed them and they look good. but he wants me to put bigger pistons in and replace the crank with an SBT crank and new seals and basicly, new motor. ****OR***
the guy that "ported" my motor says "you'll be fine just throw it back together, it'll run" what do i do? im so confused on what to do and i know nothing about these motors. he also tapped the case and added a seccond pulse line. so i'll be running dual fuel pumps (one on each carb, so they don't have to "share")

don't let the name fool you, im over seadoo's

 

[cookerq62]

I would check the bore and pistons against a service manual before boring it. Also check the crank too but a rebuild from sbt is like $200 & it is already apart. Bad cranks destroy entire motors when they let go.

 

[x2 frank]

Ya you need to make sure the crank and rods are tight if not you'll destroy that motor and waste alot of time.If your not sure SBT is good for a short block and they got a HELL of a warranty

 

[seadookid84]

the rods do have a little play in them, and feel rough. the bearings sound dry when spun. i work at the shop interning...so basicly he pays me in parts. but do i really need new pistons/cylinders? we honed the cylinders and they look fine. i think he is just trying to get me so far into a hole that i'll be working all summer for just these items. idk. what about the porting? and dual pulse lines? is this a good/bad idea?
thanks for the response

 

[aramis]

the service manual tells you the allowable bore, taper and out of round specs of the cylinder as well as piston skirt diameter, side gap, piston to cylinder clearance, etc.

Educate yourself on those so that you can ask the shop guy some more intelligent questions to see if he's giving you the honest deal or not.