GY6 Hybrid Rebuild

15 posts in this topic

Posted

Seeking some advice from the collective wisdom on the forum. I am rebuilding a microlight engine that is based on GY6 internals. It has some custom machined parts, but appears to be mostly standard GY6. The issue I have is that none of the parts have any identifying markings, so it's hard to know exactly what configuration has been used.Here are some measurements

The crankcase has been machined to 65mm. The bore is 62mm and it appears to be a standard crank with a stroke of 58.5mm. This gives a displacement of 175cc.

Stud spacing is 54mm (A block)

Cylinder height (base gasket to head gasket) is 69.4mm

Head height is 73.23mm

Cam chain is 92 links

Two valve head IN 26.5mm EX 23.2mm

Camshaft unknown, but it has a slotted drive sprocket

Carb bore is 24mm.

I am thinking of using all Taida parts for the rebuild. Looking for reliability rather than more power.

I have already ordered a 58.5 (standard) Taida crank from MM.

Contemplating fitting a X13 - Taida GY6 Cylinder 62mm 174.5cc Big Bore Kit any advantage is going to the X14 forged piston?

What length studs do I need?

Is 92 links the right length cam chain for the Taida head?

Anything else I should think about?

Many thanks

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Posted

Your on the right track with Taida ,,,the best parts out there and I'm sure dan will chime in here,,,my thoughts are standard stroke so timing chain is correct,,,I'd forgo the forged piston route,,,cast will be just fine as long as it's Taida 

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Posted

Thanks for the advice. I went with a Taida 62mm kit with a cast piston and kept everything else as it was. The 62mm BBK was quite hard to find - there were loads of 61 and 63 around, but not many 62 versions. The build is currently underway. 

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Posted

Any updates? 

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Posted

Ah yes, been a while since I checked in. The build went well and the motor had its first serious run last weekend. All good. As I said above, I was contemplating a full rebuild with new everything, but in the end just replaced the crank, cylinder and piston. I live in Australia and international shipping of multiple parts is incredibly expensive as it is calculated on each item individually and cannot be combined. Shipping on just the bits I replaced was more than $150!!!

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Posted

Ouch, that sucks on shipping, glad the bike is back up and running, cheers

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Posted

Any pictures?

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Posted

IMG_0822.JPG

IMG_0006.JPG

IMG_0082.JPG

IMG_0079.JPG

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Posted

Here's a few pics. Sorry about the formatting, sent from my iPad. As you can see, the engine is a bit of a hybrid, using both custom and standard GY6 parts. It is used to power an ultralight glider. 

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Posted

Very cool

What is all that equipment on the intake side?

 

I negeletd to address your question concerning the Forged Piston

The Forged piston is of a Slipper Skirt design and a shorter pin boss equaling a much Lighter Piston Assy...

I have a thread here addressing three different types of Piston's, Two are from Taida and one from NCY

Interesting to see NCY and Taida are using the Same Casting supplier of KB...

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Posted

Very cool

What is all that equipment on the intake side?

 

I negeletd to address your question concerning the Forged Piston

The Forged piston is of a Slipper Skirt design and a shorter pin boss equaling a much Lighter Piston Assy...

I have a thread here addressing three different types of Piston's, Two are from Taida and one from NCY

Interesting to see NCY and Taida are using the Same Casting supplier of KB...

What you can see on the intake side is a pulley and belt drive. This provides the reduction to drive a propeller - as I said, the motor is used in an ultralight aircraft.

I read your thread on pistons, very interesting. I was interested in going to a forged item, but couldn't find anyone selling a 62mm one on line that would ship internationally.

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Posted

What you can see on the intake side is a pulley and belt drive. This provides the reduction to drive a propeller - as I said, the motor is used in an ultralight aircraft.

I read your thread on pistons, very interesting. I was interested in going to a forged item, but couldn't find anyone selling a 62mm one on line that would ship internationally.

Dan the man has the 62mm forging

Taida-Pistons-Rings_c24.htm

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Posted

Indeed he does, but alas, he doesn't ship internationally 😞

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Posted

Indeed he does, but alas, he doesn't ship internationally 😞

Where are you located?, I'm in Costa Rica and I have bought stuff from Dan, there are companies that they give you an address on the US where you can ship your stuff to, they receive the stuff and ship it to you in your country, if you are in Latin America or Caribbean countries most probably Aeropost has presence in your country.

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Posted

Nice build,,looks great,,,you have bigger balls than I do,,no way I'm flying around with basically a bed sheet and a lawn chair ,,,,lol

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