it was a normal day i take the bike for a ride i started it was fine start right away i rode for 3 miles i was in the 3rd gear little metal noise came and engine died i pull the bike a side of the road. try to started but starter wont turn the engine, i try to push a bit and put first gear wheel didnt move. this bike is custom conversion from bigdog pitbull.
while driving some sound came and engine died
- Thread starter oguzb
- Start date
What is that peppered black crap on the chain, clutch outer, pressure plate? Did the fiber weld to the steel plates? If not there, might as well clean the debris, check the plates. While apart, spin the crank nut to see if the clutch outer turns. Spin the main shaft that the clutch center bolts up to.
I'd pull the plugs, see if the plugs look normal or are hammered by the valve letting go and eat the piston dome, peppering the spark plugs.
It's either the top end or bottom end, if clutch parts show good.
I'd pull the plugs, see if the plugs look normal or are hammered by the valve letting go and eat the piston dome, peppering the spark plugs.
It's either the top end or bottom end, if clutch parts show good.
john sachs
Well-Known Member
And if the spark plug you're trying to remove, doesn't want to come out easily 
, don't go further, until you pull the head off.
, don't go further, until you pull the head off.
john sachs
Well-Known Member
No crystal ball to look at price wise, until you get it ALL apart, and see ALL the damage. Doesn't look like it's gonna be an inexpensive repair. Also, before going at it "willy nilly", you may want to take step by step pictures, to get an idea of what else is damaged, and what possibly caused it.
Oh damn. That’s definitely not good. Looks like the rear cylinder. Pull the rocker cover and see what’s broken up top. My guess you dropped a valve. Possibly broken valve spring…
Keep us posted
john sachs
Well-Known Member
With a spark plug looking like that, the engine IS going to need a CLOSE to COMPLETE disassembly. Too many pieces, have circulated through it. 
knothead
Second Chance Customs
I agree totally...bottom end has to come apart without any doubtWith a spark plug looking like that, the engine IS going to need a CLOSE to COMPLETE disassembly. Too many pieces, have circulated through it.
Roaming Wolf
Member
Had the same on my Dyna. Thrust washer brokeـ
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john sachs
Well-Known Member
Good Engines. Reliable as well. I did a lot of testing on the 127" engine, when Ken Francis was in charge of the Ultima Engine Program, at MidWest M C Sales. I've won every "Dyno Shootout" I entered with it. My customers have always been happy as well.
. My customers have always been happy as well.Attachments
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That is awesome John!! Nice write up too!Good Engines. Reliable as well. I did a lot of testing on the 127" engine, when Ken Francis was in charge of the Ultima Engine Program, at MidWest M C Sales. I've won every "Dyno Shootout" I entered with it
Rottweiler
Well-Known Member
X2That is awesome John!! Nice write up too!
Hello, after i took it to mechanic we found out rear piston and rear piston head destroyed S&S SSW+ COMPLETE Big Dog, Ironhorse, Chopper,117, 4-1/8" BORE Top End KIT.
i need only rear piston head but online they sell both and its expansive, does anyone know who sell only rear or someone know how to rebuilt the one i have?
i need only rear piston head but online they sell both and its expansive, does anyone know who sell only rear or someone know how to rebuilt the one i have?
I hope you took the entire engine apart. The damage done up top could certainly have caused damage in the crankcase. Your motor needs to be completely taken apart and inspected before installing a new head. Or you will most likely just be throwing money away. My .02
As stated, it's a full crankcase split and flush. Either you sucked in something or the tulip of the valve broke off and rattled the spark plug/piston/head to bits.
That too means flush the exhaust pipe and shake out what might have entered if both valves are still in place. Probable damaged for sure if the debris got caught under the valve/seat.
Just enough pressure to blow tiny bits down the crankcase, oil pump sucks it up, tears up the pump blades via flattens the arch's and pressure is lost holding that little bit between the blades. Floats in oil, sends bits at the crank bearing, rolls over the metal like laying a penny on a train rail and digs into the race/ball, then snowballs taking out more parts.
Someone already above told you so about full teardown and didn't listen. Just saying.
Signed,
NOLTT
That too means flush the exhaust pipe and shake out what might have entered if both valves are still in place. Probable damaged for sure if the debris got caught under the valve/seat.
Just enough pressure to blow tiny bits down the crankcase, oil pump sucks it up, tears up the pump blades via flattens the arch's and pressure is lost holding that little bit between the blades. Floats in oil, sends bits at the crank bearing, rolls over the metal like laying a penny on a train rail and digs into the race/ball, then snowballs taking out more parts.
Someone already above told you so about full teardown and didn't listen. Just saying.
Signed,
NOLTT