BA Freak (155 conversion) & carbon circus

DylanS

Gorilla Smasher
Location
Lebanon Pa
Yamaha pulling a little sneaky here with the 1/2 oem barb…

Anyways I was gonna pin and epoxy it or braise it and decided against it
 

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DylanS

Gorilla Smasher
Location
Lebanon Pa
Chris from C57 is awesome to deal with and got me all patched up.
might throw a new starter at it while I’m here, it’s been slow cranking on known good cables on a NLP14.
Also painted some bed plates
 

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DylanS

Gorilla Smasher
Location
Lebanon Pa
47 minutes on a fresh crankshaft and totally smoked. Pressure tested, leak down tested. Let the ex ride it and some how or another toasted! Done with big motors. Back to the 701. Anyone have an idea what a blown 1200 short block is worth?
 

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DylanS

Gorilla Smasher
Location
Lebanon Pa
Well it ran great and I distinctly remember taking it off the stand and cranking it for her and thinking hm that sounds like it’s only cranking properly on one cylinder. She went out rode it brought it back I put it on the stand started it and cleared it out before the drive home. Went to do a compression check and the front cylinder was down 8 lbs (now wobbling in the bore) and the rear was absolutely smoked and wouldn’t even crank over.
I believe the rod end bearing and thrust washer let loose from water ingestion while running and obviously the rust occurred when once again water washed back from the water box and into the rear cylinder before I made the long drive.
I started to assume at the end there that maybe I had a leaking exhaust manifold gasket because I couldn’t figure where all that water was coming from but on tear down the gaskets looked mint. Im sure water down the carbs from me heehawing it around is what got to her in the first place.
To be honest I’ve been very very much on the fence on just going back to a reliable b piped 701 build so I could at least cruise around the lake instead of playing 15 foot off the shore for 7 minutes at a time. Fortunately it’s just money and they make more of it every day!
 

DylanS

Gorilla Smasher
Location
Lebanon Pa
Smaller things in the works… unfortunately lame home remodeling stuff came up so I couldn’t pull the trigger on one of those sexy JM engines.
Will be a .5 overbore 760 w/oem pistons and crank. All the bolt on goodies. Considering changing from the rrp pipe to a b pipe but we will see how it goes. “But Dylan, you won’t have any hit with 50mm carbs on that engine!!”
Silence! I will not hear such treasonous 50mm carb slander!

Anyways got a donor short block, picked up cyls and a head off the X, and have it torn down and began mild case porting.
Will take about .055 off the base of the cyls and have the domes cut to accommodate the piston travel above deck. I believe oem piston crown angle is 9 degrees so if the machinist maintains the 10.5 degree Ada squish we should be golden at around .032 clearance.

End goal being a reliable stout little cheap(ish) 760 short block build.
 

DylanS

Gorilla Smasher
Location
Lebanon Pa
used a light duct tape to mask off sealing surfaces and traced the grooves with a exacto.
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I used a medium abrasive in a portable bucket sand blaster at 120psi to clean my stuff up. Then hit it with some 2+2 break clean and the air hose. Works ok if you don’t have a full setup.
Using JB weld here to reinforce. I won’t be hogging the cases out to the point of removing the metal entirely but it’s going to be thinner. The epoxy will never see fuel as I personally would not expose jb weld to fuel long term. I like to use the heat gun to make the epoxy run easier and work the bubbles and air out with a screw driver. Once it starts to set up I will smooth it out real nice then run a razor over the cases to remove excess. IMG_3571.jpeg

Started working on the cyls in the mean time. I have a cheapo right angle air grinder I like to use to clean up the casting and get my angles correct so when I remove the sleeves I have a better idea of what’s going on.
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Pic attached shows the indent where I ground the excess casting out on the side. When the sleeves are pulled I will even this out and slightly taper the transfer casting(s) from the bottom up. I will also fix the horribly crooked port edges and chamfer.
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Pic of mini Grinder. image.jpg
 
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