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Fingers YaBB Moderator I still got all five! Offline Forum User LastOn: Today Join: Mar 22^nd, 2010 Posts: 3,098 Reputation: 0 Dartmouth Gender: Zodiac sign: Awards: 3 Mood:	Re: Engine woes Reply #20 - Jul 29^th, 2014 at 1:16pm 3MMTOC53 clone of a 3W about 8 years old, never a spot of trouble till this
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Fingers YaBB Moderator I still got all five! Offline Forum User LastOn: Today Join: Mar 22^nd, 2010 Posts: 3,098 Reputation: 0 Dartmouth Gender: Zodiac sign: Awards: 3 Mood:	Re: Engine woes Reply #21 - Jul 30^th, 2014 at 8:56am swapping engines........ and for the theorists, rings ordered..
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JackDD Club Member Offline Forum User LastOn: May 10^th, 2024 Join: Apr 25^th, 2010 Posts: 542 Reputation: 0 Gender: Awards: 2 Mood:	Re: Engine woes Reply #22 - Aug 4^th, 2014 at 6:36am If its not fuel or ignition, you have an air problem
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Fingers YaBB Moderator I still got all five! Offline Forum User LastOn: Today Join: Mar 22^nd, 2010 Posts: 3,098 Reputation: 0 Dartmouth Gender: Zodiac sign: Awards: 3 Mood:	Re: Engine woes Reply #23 - Aug 4^th, 2014 at 11:21am you'd think so, but with new plumbing, new carb, *(!@)#$ new every thing... as some have sugested, maybe ring shot and can't pull the fuel any more...don't think so because there is still ignition
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waverider

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Re: Engine woes
Reply #24 - Aug 5^th, 2014 at 10:09am

If honing and new rings don't fix it
. Chances are the gaskets have become hardened beyond their ability to seal the engine. Dismantle the engine completely and install new gaskets. You may not be able to buy the proper gaskets, but you can buy a sheet of gasket material. Use the old gaskets or the engine castings as a pattern to cut new gaskets. Your engine will run like new again.

You might try the Russian solution
Hit the engine with a hammer
It is supposed to free up any stuck thingy

Or if you hit it hard enough
It gets you a new engine

Brian

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Brian H
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Fingers

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Re: Engine woes
Reply #25 - Aug 5^th, 2014 at 10:25am

carb gaskets may be a problem, but on the engine, there are no leaks evident anywhere on the block - would tired gaskets leak at least a bit of residue? I had thought the carb gaskets would be taken care of when i swapped carbs....

The block has a front and back (!) with a central seam, and a one piece cylinder attached to the top of the block. Absolutely tight, to all appearances...

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Re: Engine woes
Reply #26 - Aug 7^th, 2014 at 9:25am

Sandy
As rpm builds crankcase pressure builds
i remember a race car engine developing so much power that the head lifted off the block!
i am not sure if the problem exists on the head side or the crancase side of the piston
or with the piston
start with honing and new rings
a dye penetrant under UV light would show up cracks.

the problem appears to be so incidious that the answer is either simple (occams razor) or very complex (sods law of engines)

if this were a sleeve valve engine , i would say junk it
but it is a simple two stroke

as I wrote check the fuel. you would be surprised how bad fuel can cause strange things to happen....but you have done that.

as for leakage past gaskets not being evident (from the internal pressure, I would agree that that is not the cause... but you have very few options remaining...since you have replaced almost everything replaceable.

as Al suggested did you check the wet combustion chamber pressure. two strokes are notorious for still running with very poor pressure... but being down on power.

they also are notorious for develop very strange characteristics Lips Sealed

which mystify and defy investigation

maybe Santa will be good two you and you can use the RIP solution?

good luck

Brian

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« Last Edit: Aug 7^th, 2014 at 9:27am by waverider »

Brian H
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Fingers YaBB Moderator I still got all five! Offline Forum User LastOn: Today Join: Mar 22^nd, 2010 Posts: 3,098 Reputation: 0 Dartmouth Gender: Zodiac sign: Awards: 3 Mood:	Re: Engine woes Reply #27 - Aug 9^th, 2014 at 7:06pm OK guys, time for a group hug....................on the carb there is a small square plate with 4 screws and a small hole..... in which direction does the hole point on your carb?????? Up, front, down or back.....
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Glen Club Member Offline Forum User LastOn: May 15^th, 2024 Join: Aug 5^th, 2011 Posts: 442 Reputation: 2 Sackville Gender: Zodiac sign: Awards: 2 Mood:	Re: Engine woes Reply #28 - Aug 9^th, 2014 at 8:02pm Away from the airstream sandy, it's supposed to stay at standard atmosphere.
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Fingers YaBB Moderator I still got all five! Offline Forum User LastOn: Today Join: Mar 22^nd, 2010 Posts: 3,098 Reputation: 0 Dartmouth Gender: Zodiac sign: Awards: 3 Mood:	Re: Engine woes Reply #29 - Aug 10^th, 2014 at 10:17am Thanks Glen; yup, some say doesn't matter, some say it does..mine points back
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Glen Club Member Offline Forum User LastOn: May 15^th, 2024 Join: Aug 5^th, 2011 Posts: 442 Reputation: 2 Sackville Gender: Zodiac sign: Awards: 2 Mood:	Re: Engine woes Reply #30 - Aug 10^th, 2014 at 12:42pm Oh, it matters. You start getting positive air pressure in it and the engine will do all sorts of wonky things mixture wise.
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Fingers YaBB Moderator I still got all five! Offline Forum User LastOn: Today Join: Mar 22^nd, 2010 Posts: 3,098 Reputation: 0 Dartmouth Gender: Zodiac sign: Awards: 3 Mood:	Re: Engine woes Reply #31 - Aug 10^th, 2014 at 2:34pm OK -which way
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Glen Club Member Offline Forum User LastOn: May 15^th, 2024 Join: Aug 5^th, 2011 Posts: 442 Reputation: 2 Sackville Gender: Zodiac sign: Awards: 2 Mood:	Re: Engine woes Reply #32 - Aug 10^th, 2014 at 4:53pm Whichever way will keep it from being pressurized. Thunderbolt rc even sells a "kit" that you solder a piece of tubing onto the hole, connect a piece of fuel tubing, into a film canister to ensure it stays at atmospheric pressure. http://www.thunderboltrc.com/index.php?main_page=product_info&cPath=89_142&produ...
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Glen Club Member Offline Forum User LastOn: May 15^th, 2024 Join: Aug 5^th, 2011 Posts: 442 Reputation: 2 Sackville Gender: Zodiac sign: Awards: 2 Mood:	Re: Engine woes Reply #33 - Aug 10^th, 2014 at 4:55pm This explains everything very well : http://www.thunderboltrc.com/tutorials/tutorial_seven.html
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Fingers YaBB Moderator I still got all five! Offline Forum User LastOn: Today Join: Mar 22^nd, 2010 Posts: 3,098 Reputation: 0 Dartmouth Gender: Zodiac sign: Awards: 3 Mood:	Re: Engine woes Reply #34 - Aug 10^th, 2014 at 6:32pm yup, seen the kit and heard about the phenomenum for years but never needed it.....why suddenly?
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waverider Aerobatic Pilot The Great White Flounder Offline Frozen Solid LastOn: Aug 7^th, 2020 Join: Nov 8^th, 2010 Posts: 499 Reputation: 0 Edmonton Gender: Zodiac sign: Awards: 1 Mood:	Re: Engine woes Reply #35 - Aug 11^th, 2014 at 10:17am The static pressure phenomenon cause rich lean issues (depending on upright or inverted engine)...not quitting above half throttle the hunting you describe is the engine running rich Have you run the engine on the bench in an upright position?
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Fingers YaBB Moderator I still got all five! Offline Forum User LastOn: Today Join: Mar 22^nd, 2010 Posts: 3,098 Reputation: 0 Dartmouth Gender: Zodiac sign: Awards: 3 Mood:	Re: Engine woes Reply #36 - Aug 17^th, 2014 at 11:35am in this day and age, what is the chances of, and effect of, bad gas??
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waverider Aerobatic Pilot The Great White Flounder Offline Frozen Solid LastOn: Aug 7^th, 2020 Join: Nov 8^th, 2010 Posts: 499 Reputation: 0 Edmonton Gender: Zodiac sign: Awards: 1 Mood:	Re: Engine woes Reply #37 - Aug 18^th, 2014 at 5:36pm Ask the people in Ikaluit They had a winter load of bad gas about 8 years ago Biggest issue is octane If you add an octane booster does the engine run Remember, the higher the octane the cooler the engine runs Two strokes should not care too much about octane
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Fingers YaBB Moderator I still got all five! Offline Forum User LastOn: Today Join: Mar 22^nd, 2010 Posts: 3,098 Reputation: 0 Dartmouth Gender: Zodiac sign: Awards: 3 Mood:	Re: Engine woes Reply #38 - Aug 18^th, 2014 at 6:38pm didn't try an octane booster, but did get mix a batch of fresh fuel...... no difference ops Sorry
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waverider Aerobatic Pilot The Great White Flounder Offline Frozen Solid LastOn: Aug 7^th, 2020 Join: Nov 8^th, 2010 Posts: 499 Reputation: 0 Edmonton Gender: Zodiac sign: Awards: 1 Mood:	Re: Engine woes Reply #39 - Aug 19^th, 2014 at 1:22am New idea CDI not advancing Any way of checking the timing? Another is crankshaft seal leaking
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