Suzuki GS750. using oil.

[rphillips]

2 smalls, How many and what part of the pistons are worn out? and how much will need to be removed to get the cylinders back straight in both directions?

 

[Nessism]

I've heard decent things about IMD pistons. While your at it, I'd ask about a simple valve job on the head; lightly cutting the seats and facing the valves is way better than lapping and shouldn't cost too much.

 

[bob808]

3 thou. Front to back,2 thou top to bottom and 2 thou on the pistons. Took the call at work so he said something else about the pistons and I'm not sure what. Anyway he said that was that and that I needed a rebore. Valve job sounds like a good idea. Should I strip the head before handing it over?

 

[bob808]

Another thought!


Do I look at the crank,rods ,bearings, the seals on the ends of the crank are fine?

 

[Nessism]

On 2nd thought...

In all my years here, I've never heard of anyone wearing out a set of pistons and cylinders in 24,000 miles. 124,000 miles, yes. Which is what I'd expect to get out of the engine if it's well cared for. Never in 24k. Something doesn't sound right about that machine shop that took the measurements.

Before going off the deep end, I'd remove the rings from a piston, put it into each cylinder up side down, then take a feeler gauge and cut it between the piston and the cylinder wall. The point of max wear is near the top. Most likely, you won't be able to cut in a .0025" feeler gauge, which would indicate you are okay.

I'd buy a cheap set of new rings off eBay, get a bottle brush hone with 240 grit stones, and get to work. Better check the valve stem seals because it's possible to damage them on install.

 

[bob808]

I was beginning to think the same thing, with regard to mileage / wear. Only I was thinking perhaps the clocks were swapped, interesting.I will check out the wear on the pistons, and post it on here, soon as I get a chance. .Im off to look at hones.

 

[Nessism]

I was beginning to think the same thing, with regard to mileage / wear. Only I was thinking perhaps the clocks were swapped, interesting.I will check out the wear on the pistons, and post it on here, soon as I get a chance. .Im off to look at hones.

When doing the feeler gauge test, measure at 90 degrees to the pin, at the bottom of the skirt, about 1" down into the cylinder.

https://www.amazon.com/67mm-Flex-Hone-Cylinder-Silicon-Carbide/dp/B002N36MOA