Freestyle Xscream 865 Reminder to change wrist-pin bearings every 50 hours!!

[waxhead]

Those cases are toast bud. Thats a sealing surface there and I wouldn't weld cast on s sealing surface like that.
Billet should be able to handle the weld ok and so you should be fine there

 

[waxhead]

Its not the bit missing from the bottom I would be worried about I would just blend that back in and it will be ok.
Its the top bit of the case where you want to seal on thats no good.
Oh and the offer on it, Sorry im building myself up another dasa stroker engine

 

[JetManiac]

wax, if i get it weldeded up to new and get the old sleeve pressed out.. MAYBE get a new sleeve in, I'm sure you'd want to make me an offer on the shortblock
..thats my option #2..

Other question is, what do i use to fill the chunck of epoxy in the intake? Depending on the resins, not sure If I have to rip it all out or if it can be added in and smoothed in?

Too bad on the motor.

Make sure you grind it down to fresh epoxy that has no oil/gas on it. Make sure it is very rough and clean to adhere well to new epoxy. That part is JB weld industrial epoxy.

 

[shawn_NJ]

I put the MSD Enhancer back in and the motor has been rock solid reliable since. I lost a little bottom end compared to the Epic, but I am glad to give it up for reliability. If you want to keep the Epic, try replacing your rectifier, it's the only electrical componet that I didn't replace twice.

Everything electrical in mine was brand new, and it kicked back since the first few rides. I put a brand new battery in before Daytona and it did not help at all. I planned on taking the EPIC out before spring, just wasnt sure what to replace it with. Thx for the info.

 

[Pablo]

I had good luck with the epic and added extra grounds on it as insurance. I did use a fresh rectifier, coil, and relay though.

 

[McDog]

No one aswered the question on why the wrist pin bearings need to be checked more often on these motors. Is it due to larger pistons?

Or should every bigg cc motor get new wrist pin bearings every 50 hours?

My ADA 850 stroker motor is apart for new rings already(just for maintenance). Now I'm thinking I should get new bearings too just in case.

 

[keith t]

My brother has put 800 Litres of fuel through his 827 screamer - Im at a mere 260 Litres, we both run ATP total loss and always follow a pretty good warm up/run down procedure and always fogg at the end of the day - any water ingress is gotten out and the motor run for a good ten minutes afterwards.
Can anyone suggest a recommended x No Litres or x running hours prior to bearing replacement ?

by the way new bearings are on order as a precautionary measure :fing02:

 

[Pablo]

I was told by Dasa, when I had to rebuild my SS 850, to use OEM Honda CR 500 wrist pin bearings. Just a thought.

 

[BruceSki]

What bearings is everyone using on their 865's? I'd like to pull mine down for an inspection and possible freshen up.

I have a full season on mine. APR-NOV riding 1-2x a week. -1 month that I had broken motor mounts and rode my other ski.

 

[dcptr]

I was told by Dasa, when I had to rebuild my SS 850, to use OEM Honda CR 500 wrist pin bearings. Just a thought.

The bearings supplied with the wiseco custom xscream pistons are very narrow. I had a look at the good piston and there is a good 3mm+ gap either side of it with no thrust washers either. This is why we always used Kwai bearings in out 701's, and the gap was no-where near as big as these! I want a better recommendation of wrist-pin bearings to use with these motors, no way I'm putting the yami's in again!

 

[waxhead]

You could if you ok with the hassle use full compliment bearings which have no races to hold the bearings apart and so have more rollers underload at the same time spreading the load.
The bearing shop should be able to help you on this one

 

[dcptr]

You could if you ok with the hassle use full compliment bearings which have no races to hold the bearings apart and so have more rollers underload at the same time spreading the load.
The bearing shop should be able to help you on this one

What kind of weight increase would i be looking at with those? 10, 20+grams extra each piston could be a noticeable torque decrease wouldnt it?
Taking into consideration, a 100g lightened oem flywheel makes on crank rotation, let alone the amplification on the direct drive line..?

Who wants to be the first to try? My motor won't be running for at least a week or 2.

 

[waxhead]

Not really sure to be honest. Wouldnt be that much. I doubt you would even feel the extra weight. Seadoos used to run them std on certain engines so i would think its not an issue.
I would say the larger pistons you guy are all running have a longer leverage on the bearings and thats not going to help with bearing life

 

[egbrig]

The weight of the big bore pistons isn't much more than stock and may be even less. What may have failed is the rod. It streches on the small end seizing the bearing which then explodes. It's just a matter of time. On such engines use oem or better rods only. Saving a few bucks will only cost down the road. I still think 100 hours on such a motor was a good run. Remember our engines are doing a dyno test every time we pull the throttle, not bad for an engine designed with 70 hp or so.

 

[bigo]

dam my ss865 failed aswell at only 100 litres of fuel (bad rear pto crank bearing) however i guess i was lucky i didn't bust up the cylinder or cases.
i feel your pain.

 

[fatboyktm]

When I put my 850 together I used the cr bearings, the 701 and the 650 with the spacer washers had WAY TOO MUCH side play for my taste.

 

[Tyler Zane]

Boyer, my failures were caused by the Epic CDI backfiring, not fatigue. I had no wristpin bearing failures before or after I tossed the Epic. It's a shame that the Epic works great on some ski's and not the others. The concept is great. Warning: If the Epic causes your ski to kick back or backfire, remove it or it will destroy your wristpin bearings and motor!

What did you replace it with, Enhancer? Mine kicked back atleast twice in daytona.

i have experienced it a few times as well. but i did inspect everything at 120 gallons when i had to replace a seal. all looked well and i now have 150 gallons threw her.

 

[Tyler Zane]

just how generic is the size of our wrist pin bearings? if there are better options, why have i never heard of them and how many of us could benefit from it...

 

[Pablo]

The CR 500 bearing cages (if I remember correctly) were a bit wider/beefier. I rebuilt mine last year with good top end bearings, but used an SBT crank and the crank wore out first. I don't remember the CR 500 bearings being all that expensive. New OEM crank...now that's another story. TC got me hooked up with Competitive Crankworks in Cali and they did a bang up job on rebuilding my OEM crank.

 

[INDebtSJ]

Whats the cost of a rebuild. I have a hotrods that let go after 3 years that I was going to scrap.