i'm 13 and need some help with a indy 500 efi! - Page 7 - Snowmobile Forum: Your #1 Snowmobile Forum

mrholmquist · 02-08-2012, 08:53 PM

The standard bore size for this engine is 2.8346" piston clearance should be around 0.004"
so a new piston with no wear should measure in at about 2.830" since you say your piston measures 2.827" it sounds like you have a standard bore there.
I wouldn't order parts until you resolve the bolt stuck in crank issue. If you can't get the bolt out you will have to pay restocking fees and maybe shipping for the parts you order and cannot use.

Also send us some pics of the bores , are they in good shape ? no scoring or scratches ?
how do they look around the port area. If they are damaged you may need to go oversize.

epwhitehair · 02-09-2012, 06:11 AM

Quote:

Originally Posted by mrholmquist

The standard bore size for this engine is 2.8346" piston clearance should be around 0.004"
so a new piston with no wear should measure in at about 2.830" since you say your piston measures 2.827" it sounds like you have a standard bore there.
I wouldn't order parts until you resolve the bolt stuck in crank issue. If you can't get the bolt out you will have to pay restocking fees and maybe shipping for the parts you order and cannot use.

Also send us some pics of the bores , are they in good shape ? no scoring or scratches ?
how do they look around the port area. If they are damaged you may need to go oversize.

the bolt is out! we ended up putting the bolt in the vise and turning the crank around it after heating it up... all the threads are fine, which is great!

thanks everyone!
ebben

epwhitehair · 02-09-2012, 06:12 AM

Quote:

Originally Posted by Snowweasel

I have a spare clutch to a Indy 500, (488) off a dead 1986 Polaris Indy trail. Ide let it got for 50 plus shipping.

Sent from my iPod

you have an email in your inbox...

thanks!
ebben

Snowweasel · 02-09-2012, 06:31 AM

Yeah, I got that. You should have a reply on ur email.
-Alex

Sent from my iPod

epwhitehair · 02-09-2012, 09:45 AM

Quote:

Originally Posted by Snowweasel

Yeah, I got that. You should have a reply on ur email.
-Alex

Sent from my iPod

hmmm... it didn't come through... any chance you could send it again?

thanks!
ebben

jKsled · 02-09-2012, 10:42 AM

glad to hear you got the bolt out!!!

**RJ Gleason** · 02-09-2012, 11:30 AM

I don't know why I was thinking that this was a 650 not a 500.

epwhitehair · 02-09-2012, 06:31 PM

i found a set of used pistons... the old one says "5b" on the top, what does that mean?

thanks!
ebben

scrammy650 · 02-09-2012, 06:38 PM

no decimal points that u can c maybe bored 50 thousands or .50

epwhitehair · 02-09-2012, 06:40 PM

Quote:

Originally Posted by scrammy650

no decimal points that u can c maybe bored 50 thousands or .50

nope, no decimals...

scrammy650 · 02-09-2012, 06:51 PM

the only other thing i can think of is that its a s for standard bore not a 5 but not shure

xflyer53 · 02-10-2012, 08:38 PM

What is the model # of the engine?

Guessing it is a EC50PL-07 based on the 5b that is on the piston.

That is a stock 72mm piston.

rickytmx313 · 02-10-2012, 09:10 PM

its behind the recoil and you'll need a puller to get it off

epwhitehair · 02-11-2012, 12:26 PM

E's dad here.. I figured with all of the violence this main crank has endured I better do the best I can to measure for a bend before E sinks any money into this. I expected it to be off... and I hope we can live with this.

I flushed the bearings clean with kerosene and set the crank in the bottom pan. I then spun it while I mic'd the ends. The flywheel end is out .005". We are buying new main bearings for that end since they saw so much heat and sound questionable. Do you think with this amount of bend this motor will last him a few years or more or is this a ridiculous amount and we should abandon ship right now. I imagine the machine will rattle like an old school Harley... but hey... I have a harley that guys can't believe doesn't break my back! Let us know your thoughts. After all of this I hope we are not sunk.

J and E

wastedincome · 02-11-2012, 01:25 PM

I highly suggest get all new crank bearings and then checking the crank again.

epwhitehair · 02-11-2012, 02:00 PM

all parts are ordered... including new crank bearing... should be here before tuesday! i'll post updates as we put it back together... right now we're just washing/greasing...

thanks everyone!
ebben

wastedincome · 02-11-2012, 02:20 PM

Quote:

Originally Posted by epwhitehair

all parts are ordered... including new crank bearing... should be here before tuesday! i'll post updates as we put it back together... right now we're just washing/greasing...

thanks everyone!
ebben

Ebben, did u end up ordering crank bearings for just ONE side or ALL crank bearings ?!?!?!?

epwhitehair · 02-11-2012, 05:43 PM

2 bearings at the clutch end. The others seemed OK. Money can is empty!

wastedincome · 02-11-2012, 05:49 PM

Quote:

Originally Posted by epwhitehair

2 bearings at the clutch end. The others seemed OK. Money can is empty!

tisk, tisk, I'd rather donate $10 and see you do it RIGHT then only replace half the bearings as thats NOT proper.

epwhitehair · 02-11-2012, 06:09 PM

Quote:

Originally Posted by wastedincome

tisk, tisk, I'd rather donate $10 and see you do it RIGHT then only replace half the bearings as thats NOT proper.

looking at parts it'll be another $150-$200 to put them in and have a machine shop press them... i just can't afford it.

it's all i could do to cover what needed to be covered, and the bearings seem as if they're in good shape....

thanks!
ebben