how many miles on m7 before new rings

[glaciermonkey]

was wondering how many miles people get on there m7's before they start thinking about a new top end? also is it always better to do pistons, rings and wrist pin or just rings if the pistons look good?

 

[SLEDIOT]

I ran mine till it melted down so I could justify a big bore. I got 1800 miles before melt down. Lots of this was a learning curve with mods and fuel controllers.....................

 

[89sandman]

i've got 5,000 miles on my M8 and have been thinking about doing it this summer. since the cylinders are coated if the pistons look good would just change rings...

 

[76FOMOCO]

change the pistons, rings and wrist pins!

 

[diggerdown]

change the pistons, rings and wrist pins!

X2...Piston weaken and the ring groove wears.

 

[JHG]

change the pistons, rings and wrist pins!

X3.

 

[tntm7]

i've got 5,000 miles on my M8 and have been thinking about doing it this summer. since the cylinders are coated if the pistons look good would just change rings...

why would you put in 5,000 mile old pistons?

I believe when the rings are dead the piston is dead, whats a 100 insurance policy when your 20 miles deep in the snow?

 

[bigbull]

change the pistons, rings and wrist pins!

Ditto + roller bearings!

 

[windsock]

I had just under 5000 miles and re-did my M7 this winter. Nothing ever went wrong but felt it was way past the time.

 

[joeoim]

Blew at 4870 mi

glaciermonkey,

My mechanic told me I needed to put new pistons in this summer. said old ones looked good, compression was good, but was time.

2 weeks ago I was working it pretty hard in wet snow and it blew up. Luckily I was about 2 miles from a road (was headed in). Sucked a ring into the muffler, so I rode it to the road.
New cylinder, head, pistons, so far.

Had it lasted one ore day I might have had a rough afternoon and a helicopter bill also.

Will not let it go that far in the future.

I missed a lot of good snow this last 2 weeks.

Joe