Dead evo!
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Joined: Dec 2010
Posts: 56
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Dead evo!
Went riding friday night. I wasnt on it hard, the bike backfires on it's way to dead stop, repeatedly. Checked the compression 55 on one 50 on the other. Time to start saving money for a new motor! Just bought it in November. Good thing it was dirt cheap.
Cruiser
Joined: Dec 2008
Posts: 214
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From: Peterborough, Canada
That sucks, I tore my bike down last winter to avoid a break-down. EVO's are pretty simple to work on, parts are cheap. If your rodbearings and end bearings are good, a top end rebuild is a breeze. Total cost for me was under 400 bucks, I did my own machinework, but thats not expensive anyway.
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
Just for giggles, check to see if you have adjustable pushrods. If you do then try readjusting them. Did this just start or has it been this way since you bought it. Was the engine warm and the throttle wide open when you did the compression test????? Next step is a leakdown test.
Stellar HDF Member
Joined: Apr 2009
Posts: 3,039
Likes: 11
From: Northern Ontario
Just for giggles, check to see if you have adjustable pushrods. If you do then try readjusting them. Did this just start or has it been this way since you bought it. Was the engine warm and the throttle wide open when you did the compression test????? Next step is a leakdown test.
Seasoned HDF Member
Joined: Nov 2009
Posts: 15,705
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From: Farmington ,MS
Since your compression is that low, but pretty equal between cylinders ...I am betting on inner cam bearing failure...which has allowed it to jump time. If you lucked out and it did not damage the case...it could be a pretty cheap fix...good luck and let us know what it was.
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Joined: Dec 2010
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Checked the compression turning it over. Thing could d@mn well be a nasa rocket and Ive got no one to help show me how. But it,s never done this before. Seems like the valves got louder just before it happened.
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Tourer
Joined: Nov 2007
Posts: 334
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Well...
Take your time, I know you're kinda freaking out right now, spring being right around the corner and all, but I'm betting it's relatively easy fix. Compression being almost even between the cylinders is a good indicator.
I've been there, my current bike had lowish compression I thought and I was ready to order a replacement motor until cooler heads on this site got me rethinking a few things... I replaced the cam, the carb and the pipe and it's running very well. Later on I'll pull the heads and get them ported and polished, maybe mill .050" off and she'll be just the way I wanted her. Thanks to these good folks I've still got the $6000 I was planning to spend on a new engine...
If you don't feel up to all of this, find a local indy mechanic, check some references, and see what he says.
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Ultimate HDF Member
Joined: Aug 2008
Posts: 5,413
Likes: 17
From: eastern oklahoma
i'm about in the same boat with an fxr i just got. this thing isn't a rat bike, it scares away the rats that might get near it, it's that bad. i just about got the motor pulled out, i was planning on sending it off and doing the harley remanufacture program. it costs $2395 and i can haul the motor up to the harley shop and in a couple of weeks i get basically a new motor. the welded up head from the hillbilly repair of a broken exhaust stud and all the other crap is going to be history. good luck with your motor. i will tear open the cam chest to peek in there along with the heads to see what the condition of the motor is in. if it's not looking bad inside, i'll do the top end rebuild with fresh heads and run it till she don't wanna go no more. the guys in here have been around the block with these motors, so i appreciate having access to their knowledge and advice.
