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Gy6 50 cc. With 100cc bore kit

Starter won't turn over new higher compression cylinder/ head. Do they make a thicker head gasket or do I have to add another cylinder gasket to lower compression?????

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  • Cars & Trucks Master
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If the battery is in good condition and has the capacity to do the job it should turn over the motor regardless of the compression . Are you sure that the piston is not hitting the head. I doubt if you will get a thick gasket to do the job so 2 gaskets may be the answer. By not hitting the head I mean that you will have a standard head gasket that will overlap into the bore area and the piston is hitting the gasket instead of moving past the lip.

Posted on May 03, 2013

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Have the head gasket torqued to 60psi each bolt? if so, either the spark plug grooves got a crack, or the head is bent due to a past overheat... or overheats. If so, send the head to a machine shop and have it leveled out, and replace all gaskets replaced when putting back on. That includes, manifold, header, and head gaskets, as well as the oil seals and O-rings. Hope this will help you.

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ok, its time for a radiator flush. there is major sludge in the internals of this radiator. Make sure the thermostat is in the correct position as well. I've seen many cars come into my shop with the thermostat inserted backwards.

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SOURCE: Have a 2003 Taurus, 3.0 engine that has a misfire

Sound like an air / vacuum leak to me.
Re-check for an air leak on #2 cylinder inlet manifold.
Use a propane torch (unlit, of course) to flood propane gas around inlet manifold/head flange & gasket area.
If there is any change in idle speed during this test you have a vacuum leak.

Posted on Aug 18, 2009

ghost45
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SOURCE: one cylinder has zero compression. took head off

OK!... did you do a cylinder 'leak down test'?.. .if not, do it! If any 'unacceptable' leakage, have the head REDONE! NOW!.. you must BE SURE the valve timing is accurate!... Go to www.hmaservice.com and register( Vehicle by VIN). Afterward, you have access to shop manuals, service bulletins, wiring diagrams, etc. about your vehicle.

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SOURCE: Combo diesel engine blows blue smoke from only one

Blue smoke means that the cylinder is burning oil with gas/diesel. White smoke means that the engine is cold and excess fuel is being burnt. It means that the cylinder is having worn out rings.They need a change. Also check the engine oil level as well. It may be going low gradually.

Posted on Jan 01, 2010

Testimonial: "hello shiela65 You are right the oil is going down gradually. What is the number of hours required to change the rings, Thank you."

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196cc Honda clone engine burns oil.can this be fixed by replacement of top compression ring?


You don't replace just the top ring, you do them all

If the cylinders are not bored, it could be no ring replacement
will help

You need to ask that at an engine machine shop, in person

If your doing your own work & did a head gasket & not heads
& valves, your doing a lot of work & not fixing much when
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You ask a question no one can answer

You don't say it has 150,000 miles & is worn out

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do a compression test engine could warped head or damaged pistons scored cylinders bores.

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I over heated,the serpentine belt snapped. Opened the hood to find steam rapidly coming out of both the antifreeze and out of the engine right by the head gasket. It wasn't smoke not blue or black jus


Perform a compression test on your cylinders. One unfortunate result of overheating is the blown head gasket. Without compression your motor will not run. Tester are not super expensive or some stores will lend tools.

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1993 Subaru loyale no compression, have spark at the coil just won't start


The engine can't run without compression in the cylinders. The plug will still spark, but without a compressed air/fuel mixture to burn and power the cylinder down, the starter will just keep spinning the engine over, cranking forever and not starting.
Check if your timing belts are good and not broke. Cylinder compression is dependent on good piston rings, intake and exhaust valves that open and close at right times and that seal good when closed, and a head gasket that seals up the cylinder from leaks where compression could blow into the water passages, or oil passages, or to outside of engine.
If the timing belts are good, a leak-down test of each cylinder will pinpoint where compression is lost.
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My 2001 ford escape won't start . I checked all


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IF YOU REPLACED THE HEADS WITH REBUILT/NEW HEADS:
A side effect of increasing compression when you bolt on fresh heads, is broken piston rings. It's beneficial to replace the rings & bearings and at least remove the ring ridge at the top of the cylinder wall if not re-bore when replacing heads due to the higher compression that will cause.


If you just put on a set of used heads.

There's also the chance that the new headgaskets didn't seal completely, (usually due to a problem with surface prep or a warped head/block), but if you've got high mileage, it's usually the rings.

A set of rings can be replaced, but you'll want to make sure they haven't cut into the bore so much as to cause blow-by once new rings are installed. Eliminating the ridge by carefully using a ridge reamer at the top of the cylinder to prevent breakage of the top ring from impact.
Hone the cylinder walls gently & reinstall pistons & new rings!
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1 Answer

Head gasket


The best solution? Remove the heads, have them planed to true them up and put new gasket set on. Depending on how many miles the engine has on it, it may be needful to have the heads reworked. New valves guides, the valves ground and seated. If it has a lot of miles it could be best to purchase a set of remanufactured heads. If the engine is low miles a gasket set and planing the head will probably do it. If you just have one head plane, make sure to get the proper gasket for that head. The planed head will cause that bank of cylinders to have higher compression then the other non-planed side. You will have to get a thicker gasket for that side to keep the same compression. Your machine shop can tell you how much they took off. Hope that helps.

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