- Location
- Ireland
Quick q are bottom cases matched as pairs or can they be interchanged, 61x 701
Super Jet Cases
- Thread starter ryallshire
- Start date
- Location
- uk
61x and 62 t are different I think as one is single carb and one is duel carb
BruceSki
Formerly Motoman25
- Location
- Long Island
they are a matched set. They are machined for the bearings as a set. Mix and match might work, or it might not. It's a gamble.
- Location
- Ireland
my problem is that the bottom half of my 61x case is cracked and just want to replace lower half to save work or will i have to replace the two
BruceSki
Formerly Motoman25
- Location
- Long Island
Replace both.
- Location
- New Jersey
^ i agree, i think it was over on pwctoday, there's a lengthy 25 page thread of a guy trying to diagnose an engine problem. he fried a top end and rebuilt it and got it ported. Went back out and immediately fried another top end. so he tore the motor down, etc... couldn't figure out what was going and eventually realized his cases weren't a pair. Nonetheless, wasted tons of money. and i think it took a full year or two to figure out what the problem was.
How do mis-matched cases which would potentially bind your crank bearings cause a top end problem?
I guess if they didn't seal up properly you could be frying top ends, but I would assume someone building an engine, particularly with mismatched cases, would verify that they were sealed up with a leak test prior to running the engine
If he was too careless to check his cases then he probably missed what was actually causing his melted pistons.
- Location
- Holmes, NY
Get matching cases or you will be building another motor for that ski soon.