Xtwin piston ring specification

[blackheart]

#307 started life out rough as a demo bike.  I finally have been riding it regulary and have put about 3000 mi on this year.  It appears it is an oil burner.  This is not totally a surprise since it was found with aluminum shaving in the oil sump when i rebished the tranny.

If the piston scuffing isnt that bad such that the ring groove area is unaffected,  I might be able to get by with new rings.   Does anyone know the style of ring they used?  Im assuming yhe are 1.5/1.5/3.0 mm ring package, but i was curious if EH ised a Napier 2nd ring, and was the top ring anything other than ductile iron?  If someone had a hastings number or something that would help

[wytfut]

Rich....
I'll get Jamie on here to answer...... I don't know what he uses for rings... especially if still on stock bore..
as for your filings... we can into some filings on Devins Blu this past winter..
Turns out it was case hardening off of the ramp drives....   I'm only saying this as I know you pulled the tranny and did the bushings..   don't know if you went a little deeper on the crank side....
as always good to hear from you...
Bruce

[blackheart]

Bruce,

Actually I didn't give the whole story.  I saved back a good amount of filings as i was concerned where it came from.  Tgey were non magnetic and more in a sheet form or flake so that left aluminum or bearing material,  it appeared to be aluminum .  I took it to work and shot it with an xray diffraction set up, it came back 97% aluminum, so I'm quite certain its pistons.  Besides at a good tablespoon of material no bearing in an automotive application would still be running.

What I should do this winter is pull the plugs and use a bore scope to see what the cylinder walls reveal.

She runs good, it just appears it takes about a quart every 2000 miles.  No leaks and it has never belched oil into the breather and I still have the hose hooked up with the stock filter and beefed up bracket. 

Hope things are well with you

[Traveller]

We seldom re-use the OEM pistons as motors that come here often require more extensive repairs than just deglazing, but we do use some Hastings rings.

In our experience XTwins don't burn oil, but the ring lands can be damaged which might account for some of the aluminium that you found.

Call Marty at Atlantic E-H 540-298-9310, she can help you find what you need. That's what we do...

Ride Safe,
Jamie

Atlantic Excelsior Henderson, llc.

[blackheart]

OK Jamie, that helps.  I will evaluate the rest of this season and see if i use much oil.

Im assuming the Ross pistons for sale are 2618 forgings and not 4032.  Do you know?  Most of the JE/CP/Ross/Diamond pistons are 2618 forgings which have to be fit looser.

[blackheart]

Update on 307 oil burner:  I dont think its using much oil.  Ive got 1250 miles on this change and it is sitting at the bottom of the second X below the max Cold, when hot and air has settled.  I filled with 4 qts as I did after transmission job.  In about 3300 miles after transmission job i only added 1/2 qt.  Ill keep monitoring for level being careful to follow the oil check procedure.

[2CoolWheels]

Wow, must be nice to have Xray diffraction equipment at your disposal, LOL! I just have to chew on it to see if it's aluminum!

[blackheart]

Yes!  Very handy for positive material identification.

[Traveller]

Rich,

Ross Racing Pistons are forged from 2618 billet bar stock, heat treated and aged to T61.

To your oil level vs. usage observations, I have found inconsistencies in the length of the rubber dipstick tubes. Some as great as 1.25", but most seem to be within .25" of each other. Still, it does add to the learning curve.

[blackheart]

Well, looks like my original assessment was correct, this #307 does like oil more than it should.  Got 1750 miles on this oil chage and i had to add 1/2 qt to get it back up in range where it was.  No external oil loss, air filter still white from day one even with crankcase vent hooked up.  Its not terrible by any stretch so i will keep monitoring.   I hope to put 5k on this year which isnt much but this is the first year since 2012 when i bought it that ive ridden it much.  If i get 5k on it this year she'll have 13000 on the odometer. 

[Donkey Hotey]

There's a set of new rings on eBay right now.

[blackheart]

Thanks.. i saw the complete setz and decided to buy one but the wording was confusing and it stated one set but also said included the same p/n for a complete set.  I bought one but asjed the seller a question if it was for two cylinders or one.  He canceled the sale, refunded my money & took the remaining set off ebay.  Likewise he had a set of valves.   Photo showed 4 valves, p/n listed was for intake valve.  Photos clearly showed two were smaller in diameter, so i asked a similar question.  One, add stated a set, was that two?  Next I asked about the exhaust valve.  He immediately took ofg ebay claiming incorrect representation.   Not sure he really knows what he is selling.  I was willing to give $40 for a complete set of rings but not $80.  $80 is 20% the cost of replacement pistons, rings & pins.  Chances are it needs bored anyway.  I wont pull apart until it really needs it.  In the mean tome Ill top it off every 1500 miles.