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Post  mitchg95 Fri Aug 24, 2012 2:53 am

i have a super tigre s2000 25cc glow engine that i purchased used for $60 a few months ago, and i took the cylinder head off last night to look inside, and it appears some one drilled a small whole (1/64-1/32'') in the head of the piston : @#!*% : i think i might turn a new piston on a lathe in my cnc class if i can stay after class ends.
does anyone have suggestions on how to go about this repair? i still need to find out if the piston is aluminum or steel, should i make a new sleeve to fit inside the cylinder also?
and how would i remove a prop drive plate that is held on by a collet?

how should i go about making a new piston ring, as this is a ringed engine
thanks, for putting up with all my questions, you guys have been a great help for me and i look forward to learning more for this awesome forum Smile
MitchG95


Last edited by mitchg95 on Sat Aug 25, 2012 5:08 pm; edited 1 time in total
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Post  mitchg95 Fri Aug 24, 2012 3:32 am

i search "why does my piston have a whole in the top" and found a snow mobile forum where some one posted that they have a whole in the top of the piston that just "appeared" and they have not messed with the engine in any way, well, from what i read is that they ran the engine to lean and it caused a whole to be burned in the top of the piston
Do you think this is what could have happened to my piston, the previous owner ran it to lean?
some one else with a whole burnt into there piston http://www.greenhulk.net/forums/showthread.php?t=59223

how ever the pictures he shows of the whole are different than what my whole in the piston looks like, again mine looks like it was drilled into?

i have pics ready of the whole in the piston, i just have to figure out why i cant get into my servimg account
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Post  John Goddard Fri Aug 24, 2012 4:53 am

I used to do something similar with my Suzuki X7 production
Racer every 2 races or so back when Noah was building his boat
Mitch. Very expensive forged pistons were the answer.
Shocked
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Post  mitchg95 Fri Aug 24, 2012 5:02 am

John Goddard wrote:I used to do something similar with my Suzuki X7 production
Racer every 2 races or so back when Noah was building his boat
Mitch. Very expensive forged pistons were the answer.
Shocked

? were would i get a forged piston for this engine?
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Post  Cribbs74 Fri Aug 24, 2012 6:44 am

mitchg95 wrote:
John Goddard wrote:I used to do something similar with my Suzuki X7 production
Racer every 2 races or so back when Noah was building his boat
Mitch. Very expensive forged pistons were the answer.
Shocked

? were would i get a forged piston for this engine?


Mitch, if you have a hole in your piston something ain't right and should be addressed along with replacement of the piston. Holing usually occurs when ignition timing is off as well as lean burning. Your cheapest and safest route would be to find a stock piston for it and figure out what holed the piston in the first place. A good cleaning is adviseable to find out if any metal went through the engine.

Ron
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Post  mitchg95 Fri Aug 24, 2012 9:39 am

cribbs74 wrote:
mitchg95 wrote:
John Goddard wrote:I used to do something similar with my Suzuki X7 production
Racer every 2 races or so back when Noah was building his boat
Mitch. Very expensive forged pistons were the answer.
Shocked

? were would i get a forged piston for this engine?


Mitch, if you have a hole in your piston something ain't right and should be addressed along with replacement of the piston. Holing usually occurs when ignition timing is off as well as lean burning. Your cheapest and safest route would be to find a stock piston for it and figure out what holed the piston in the first place. A good cleaning is adviseable to find out if any metal went through the engine.

Ron


i hope metal did not go through, i looked for parts for this engine and i could not find any, the search will continue
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Post  mitchg95 Fri Aug 24, 2012 5:40 pm

help with a piston (solved) 4lvOk" alt="" />
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Post  lousyflyer Fri Aug 24, 2012 6:16 pm

Well there's your problem right there - somebody stuck an ink pen in your piston. Very Happy But seriously man, you gotta do something about the size of your pics. On my screen, your avatar is bigger than your pictures. And oh yeah, that hole is from a hot spot formed during preignition, I think.

help with a piston (solved) Pichel10
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Post  fit90 Fri Aug 24, 2012 6:21 pm

lousyflyer wrote:Well there's your problem right there - somebody stuck an ink pen in your piston. Very Happy But seriously man, you gotta do something about the size of your pics. On my screen, your avatar is bigger than your pictures. And oh yeah, that hole is from a hot spot formed during preignition, I think.

help with a piston (solved) Pichel10

That makes good sense. Most of the bigger Super Tiger engines are made to run on 5% and lower nitro yet most people treat them like a .40 size sport engine. Too much nitro could easily cause early detonation/pre-ignition and problems with the connecting rod.

Bob
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Post  mitchg95 Fri Aug 24, 2012 6:32 pm

lousyflyer wrote:Well there's your problem right there - somebody stuck an ink pen in your piston. Very Happy But seriously man, you gotta do something about the size of your pics. On my screen, your avatar is bigger than your pictures. And oh yeah, that hole is from a hot spot formed during preignition, I think.

help with a piston (solved) Pichel10

lol, my thats the best i can do with my imagur account, the next size larger would have only showed my hand, i was pointing out where the whole is with the pen lol
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Post  ahrma_581 Sat Aug 25, 2012 10:49 am

Taking a stab here, since I can't see anything in your picture, maybe just a hole for a piston ring retaining pin? Common practice on larger two stroke engines to keep rings from rotating so ring end doesn't snag in the exhaust port. Usually pin is pressed in radially (from the side...), but I have seen pins pressed in from the crown.

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Post  lousyflyer Sat Aug 25, 2012 11:03 am

Regardless, that piston's got to come out for closer inspection.
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Post  Surfer_kris Sat Aug 25, 2012 4:14 pm

Well, the picture doesn't really show anything. But if the hole is at the outer rim right next to the piston-ring then it is bound to be a hole for the ring alignment pin. It cannot be related to pre-ignition, that would give you a distorted piston around the center. And certainly not something that looks drilled.

If the engine runs, then just leave it as it is, don't fix something that isn't broken.
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Post  mitchg95 Sat Aug 25, 2012 5:07 pm

Surfer_kris wrote:Well, the picture doesn't really show anything. But if the hole is at the outer rim right next to the piston-ring then it is bound to be a hole for the ring alignment pin. It cannot be related to pre-ignition, that would give you a distorted piston around the center. And certainly not something that looks drilled.

If the engine runs, then just leave it as it is, don't fix something that isn't broken.

that is probably it, it is near the outer rim
thanks for all the help guys Smile
i just need a muffler now...
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Post  RknRusty Sat Aug 25, 2012 7:25 pm

mitchg95 wrote:...thanks for all the help guys Smile
i just need a muffler now...
And an image host. Smile Photobucket works well for me.

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Post  mitchg95 Sat Aug 25, 2012 10:14 pm

RknRusty wrote:
mitchg95 wrote:...thanks for all the help guys Smile
i just need a muffler now...
And an image host. Smile Photobucket works well for me.

ill look into photobucket Smile
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Post  mitchg95 Sat Aug 25, 2012 10:23 pm

help with a piston (solved) 3543b953


haza it worked Smile
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Post  Surfer_kris Sun Aug 26, 2012 2:01 am

Yes, that is for the pin that keeps the ring form rotating.
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Post  RknRusty Sun Aug 26, 2012 2:07 am

Well that has to be a huge relief. Not many times a hole in a piston isn't a bad thing.

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Post  mitchg95 Sun Aug 26, 2012 2:08 am

RknRusty wrote:Well that has to be a huge relief. Not many times a hole in a piston isn't a bad thing.

it is, im sure glad that it is meant to be there
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