THE NEW MT 57CC ENGINE

[rcign]

BPMR6F or RDJ7Y..spray some silicone in the cap, makes it come off easier later....Urban myth #2..Crosshatch marks are necessary in a chrome or Nikasil bore 2 stroke...WRONG....
The crosshatch marks are below the smooth surface of the bore...Crosshatch marks above the smooth surface would wear the rings out VERY quickly.....
The bores are finish honed with crosshatch marks before plating or chroming...After plating the bores are lightly honed with diamond or Borazon stonesto smooth out the high spots...The crosshatch marks are the valleys between the smooth highs....

[mistydee0]

Ralph,
The plug is the NGK 6A type with the washer. Takes a 3/4 socket to remove. I bought 60 of the 6f plugs to replace the hokey chinese plug and I could'nt swap out the plugs for the customers. BUMMER!!!!! Now I am sitting with 60 plugs that are wrong.

Larry LS PRO ENGINES


AIRBORNE RANGER

[jrjohn]

Ralph, did you get your motor? Please give us your initial observation.

[rcign]

Not yet, there's a package at the Post Office, just can't get it until Monday......

[rcign]

No problem, Larry, those plugs fit almost every engine.....Put 'em on your website, people are always needing spares....Every Zenoah 38,45,62, and 80-----ALL Quadra engines....ALL Sachs cylinders...All Brillelli engines, unless he changed...ALL chainsaw conversions....And more

[jrjohn]

	Quote: Originally Posted by rcign
	Not yet, there's a package at the Post Office, just can't get it until Monday......

Sound like a night operation to me, there is no reason why you can't pick that thing up around 1:00AM if you have any decent buddies to help you.

[Al Lewis]

	Quote:
	Crosshatch marks are necessary in a chrome or Nikasil bore 2 stroke...WRONG.... The crosshatch marks are below the smooth surface of the bore...Crosshatch marks above the smooth surface would wear the rings out VERY quickly.....

Amen to that brother. Rings wouldn't stand a chance against Nikasil with cross hatching. BTW Ralph, I may have found a substitute for chrome that's better then chrome and a lot harder wearing. Cheaper then Nikasil though.

[Tired Old Man]

Ralph,

I read one of the posts farther back from someone that is thinking "no more Brillelli" about 6 bolt hubs on 50cc engines. Seems he believes that a single bolt hub let's the prop slip

My personal experiences are that anyone that has more than an 8 year old girls strength can tighten a single bolt hub well enough that the prop or backplate remains secure. 6 bolt hubs on small engines are little more than "bling" to me and originally only a marketing ploy.

What's your opinion? As if I didn't already know....

[jrjohn]

	Quote: Originally Posted by Pat Roy
	Ralph, I read one of the posts farther back from someone that is thinking "no more Brillelli" about 6 bolt hubs on 50cc engines. Seems he believes that a single bolt hub let's the prop slip My personal experiences are that anyone that has more than an 8 year old girls strength can tighten a single bolt hub well enough that the prop or backplate remains secure. 6 bolt hubs on small engines are little more than "bling" to me and originally only a marketing ploy. What's your opinion? As if I didn't already know....

Pat, I always felt the ideal setup was having a choice of single nut, 3, or 6 bolt hub. The MT-57 gives you 3 choices. It probably cost a little more to give this type of setup, but in my opinion it's worth the extra money.

[jrjohn]

Pat, here is what you wrote on another thread earlier today about the single bolt hub. (it's a copy and paste) it seems you were concerned about todays wooden props being compressed and splitting with the single center bolt. I agree with you, my friend with a B 366 had this exact problem among others.

quote
"A single center bolt should be run down pretty tight. Where I work the number is well over 100 inch pounds. I apologize for not being specific. The problem with this is that wood props compress much too much with high center bolt torque loads. The props of today are not nearly as hard a wood as those of 10 or 15 years ago. Back then the wood was typically maple and did not compress much". unquote

[closetguy]

Thanks, Ralph, Johnny on the spot as usual.

[sinergy]

	Quote: Originally Posted by Pat Roy
	Ralph, I read one of the posts farther back from someone that is thinking "no more Brillelli" about 6 bolt hubs on 50cc engines. Seems he believes that a single bolt hub let's the prop slip My personal experiences are that anyone that has more than an 8 year old girls strength can tighten a single bolt hub well enough that the prop or backplate remains secure. 6 bolt hubs on small engines are little more than "bling" to me and originally only a marketing ploy. What's your opinion? As if I didn't already know....

Pat that is a good point... I have never had a single bolt slip a prop.. guess I have more strength than an 8 yr old

As far as the 24" prop needed for an EF Yak that in itself is funny... there is a few hundred out there flying just fine on 22x8s and 23x8s. Keep digging that hole... it's funny to watch.