Spoody6677
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Found some at Napa auto parts
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Ring orientation
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Spoody6677
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are the cylinder head jugs, 17 # torque and head cover, 717 2stroke, manual confusing
Cylinder head to 9 pounds and then re torque to 17 pounds. Is what I’m seeing
That is the cylinder cover, not the cylinder to crankcase
17 and re torque to 30 for the cylinder
Make sure you follow the torque sequence in engine top end section of manual as well as loctite blue on threads and a dab of grease beneath the head for proper torque.
Have you checked your end gap measurements with a feeler gauge? This step is very important as are all the steps of course, good luck. Let us know how it goes
Spoody6677
Member
717 2 stroke, It has 2 ring groove, 1 groove is narrow does not have locating pin, the other groove has a locating pin worn down flush to bottom of groove, can I locate the ring gap over the location as a reference, I can not see how remainder of pin could ever be removed, without damage to piston groove, will it be OK to install in piston and hold that position
Again, my apologies but I’m finding it difficult to understand what your asking, it may help if you uploaded some pictures, but I will do my best. The locating pin should be flush, it is not worn down as these are new pistons I’m assuming? Or are they used? If your saying the 1 groove for the ring has no locating pin I would not proceed to instal these pistons without a locating pin. Pretty sure the ring will rotate and catch on a port and destroy your engine
Just re read your last post, if the locating pin is flush with the bottom of the groove I would not use them
Spoody6677
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Spoody6677
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The top groove is really narrow and also ring, I could see how it would have a locating pin
I’m looking at an old piston of mine and the pin is recessed, but it is there. It would really be your judgement if the pin is there or not and if it would stop the ring from rotating. What’s the background on the machine, what happened to it and what are you doing? Maybe @mikidymac can advise you?
From what your saying i think your wasting your time putting those pistons in
Spoody6677
Member
The pin seems it could stop ring , I just ran a scribe and could feel the head if pin. The top ring groove with is .040 and the one with locating pin is .080 I put a new crankshaft in, leaking center seals, and bad outer bearing, which may of caused slight bent rod
Yeah, I just went and checked an old piston I have and there’s not a lot of pin sticking out, wish I had a new piston to look at, I can’t remember how far they come out when new. Anyways I will leave it up to you but I would not use it if there’s no pin on the 1 groove.
Spoody6677
Member
The top groove is only .040 wide, just can't see it having a locating pin.
I just did a little research and that top dyke ring ( semi trapezoid ring is supposed to have a pin ) Also Mikidymac mentioned in an earlier post on here that it does as well.
Spoody6677
Member
I will clean really good in morning, and take a really good look, thank you
JC-SUPERJET
Active Member
So spent big money on a New Crankshaft but want to reuse questionable used Pistons? Probably not going to save any money. Odds are against you.
If the old Pistons fail, the Crankshaft will probably need to be replaced again...
Did they have good Compression prior to disassembly? What is the Piston to Bore clearance? In or out of Spec? Bore Wear and Roundness in or out of spec?
Download a free Service Manual. Don't fly blind.
If the old Pistons fail, the Crankshaft will probably need to be replaced again...
Did they have good Compression prior to disassembly? What is the Piston to Bore clearance? In or out of Spec? Bore Wear and Roundness in or out of spec?
Download a free Service Manual. Don't fly blind.
WhiskeyD
Well-Known Member
Auto parts store will have 518 or the Permatex equivalent.
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