Engine 781 Big bore 62T/61X $OLD

[x2canaan]

• 62T Bottom, DASA ported and filled
• 5mm stroker plate
• 61X Top, Blowsion pre ported big bore sleeves with 5mm shaved off the top.
• Motor is in the break in stage and has some weird wear on the cylinders.
•ADA Head 38cc domes
•Compression read 150 in each hole but my gauge is a piece of poop
•Jetmaniac SBT Crank
•PFM Lightened 61X flywheel
•Brand new Stator from jetmaniac
•Surf armor bilge setup
•Surf Armor battery and starter cables
•Billet ADA Coupler

I can include a black engine cradle the current ones are modified for a X2
If you want any pictures of the flywheel let me know!

Asking $2000 + 100 ship
Open to offers!
located in Houston Texas

 

[x2canaan]

Video Of it running

 

[McDog]

So non stroker crank in cases setup for 5 mil stroker and sleeves are shaved 5mm? That is confusing. Was the cylinder and domes setup for 5mil before and you converted it back to standard stroke?

 

[x2canaan]

So non stroker crank in cases setup for 5 mil stroker and sleeves are shaved 5mm? That is confusing. Was the cylinder and domes setup for 5mil before and you converted it back to standard stroke?

It’s a stock stroke motor, I picked up the motor blown and it had a Stroker plate on it and I was confused for awhile but it’s a rare thing to see, all it does is move all the ports up 5mm.
Edit: it also gives the ski a really nice idle sound. Sounds nothing like a Yamaha at idle


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[WetMitten]

So the entire top deck was milled down 5mm or just the sleeves?

 

[x2canaan]

So the entire top deck was milled down 5mm or just the sleeves?

5mm off the top deck.


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[WetMitten]

Was the 5mm removed from the top deck when it had the stroker crank? Or was the cylinder decked when you put the ss crank in it?

 

[x2canaan]

Was the 5mm removed from the top deck when it had the stroker crank? Or was the cylinder decked when you put the ss crank in it?

It never had a stroker crank, it’s just a way to move the ports up 5mm.
5mm off the top of the cylinders, then a 5mm stroker plate to move the cylinders up 5mm


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[Llopness]

moving the ports 5mm reduces exhaust timing to 82 degrees and intake to 110 on a stock 61x sleeve.
65u pistons implies an 84mm bore
"Blowsion big bore" sleeves are 89mm
can someone explain what the heck is going on here?

 

[WetMitten]

moving the ports 5mm reduces exhaust timing to 82 degrees and intake to 110 on a stock 61x sleeve.
65u pistons implies an 84mm bore
"Blowsion big bore" sleeves are 89mm
can someone explain what the heck is going on here?

Blowsion Cylinder Sleeve - Yamaha 785​

Yamaha 785 SuperJet 84-86.5mm Big Bore Sleeves. Performance Pre-Ported. To be used with stock stroke through 6 mil stroker motors. Blowsion custom designed include a wider exhaust port, wider boost port, deeper transfers and a narrowed skirt. Sold Each.

 

[Big Kahuna]

@Jr. @egbrig

 

[maxboost]

moving the ports 5mm reduces exhaust timing to 82 degrees and intake to 110 on a stock 61x sleeve.
65u pistons implies an 84mm bore
"Blowsion big bore" sleeves are 89mm
can someone explain what the heck is going on here?

i think he moved the ports up which increases durations hence the spacer plate moving the cylinder upwards. I bet it rips pretty hard upstairs

 

[Parsonsjb88]

Is the epoxy job on the PTO side intake failing?

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[Big Kahuna]

Guys, borderline post dumping...........

 

[Llopness]

Anyone know what the original port heights is on those? If it’s designed for a 6mm stroker decking 5mm for stock stroke is still 2mm extra.

 

[x2canaan]

Anyone know what the original port heights is on those? If it’s designed for a 6mm stroker decking 5mm for stock stroke is still 2mm extra.

It’s my fault you guys think it has to do with stroke, it’s a motor with ports raised 5mm. Nothing to do with stroke.

 

[Llopness]

asking what the port timing actually is since it’s uncommon to see a motor with the port timing raises this much.

 

[x2canaan]

asking what the port timing actually is since it’s uncommon to see a motor with the port timing raises this much.

No clue, motor rips hard down low and up top though!

 

[x2canaan]

i think he moved the ports up which increases durations hence the spacer plate moving the cylinder upwards. I bet it rips pretty hard upstairs

^ maxboost explains it better than me

 

[Llopness]

I understand that bit and maxboost sent me a message with some maths(but for a stock 61x) So I’m piqued to know what the timing actually is.