Adam76 . . . . WOW!!!!!! This is the VERY FIRST and ONLY Twin Cam powered 2002 Fat Boy with the drive chain and sprocket . . . on the RIGHT SIDE! This is a photo of a SPORTSTER. Too funny.
Adam76 . . . . WOW!!!!!! This is the VERY FIRST and ONLY Twin Cam powered 2002 Fat Boy with the drive chain and sprocket . . . on the RIGHT SIDE! This is a photo of a SPORTSTER. Too funny.
That was Matt showing what his smoking cylinder looked like...
Thanks djl, I'm going to pull down the rear cylinder and have a look. It's funny because I got the machine shop to gap and install the rings for me, so this very thing would not happen!! I'm ordering a new set of rings for the rear cylinder now.... Should I redo the front piston rings as well? Or leave that cylinder alone?
Thanks for your advice.
If it ain't broke..................... ;I would leave the front alone.
Just because the work was done in a machine shop doeen't mean something can't be wrong but you won't know without a look/see. With the three heat cycles and 25 miles, it could be that the rings in that cylinder are taking longer to seat. 98HRFB's suggestion of putting a few more miles of "break in" isn't a bad idea. Give the rings another 100 miles or so of break in riding before pulling the head. Who knows, worth a try and the rings might seat.
If it ain't broke..................... ;I would leave the front alone.
Just because the work was done in a machine shop doeen't mean something can't be wrong but you won't know without a look/see. With the three heat cycles and 25 miles, it could be that the rings in that cylinder are taking longer to seat. 98HRFB's suggestion of putting a few more miles of "break in" isn't a bad idea. Give the rings another 100 miles or so of break in riding before pulling the head. Who knows, worth a try and the rings might seat.
Thanks djl. I did another 50 miles and no change. Now starting to get a puff of white smoke coming out the air cleaner when the engine is shut off, not sure what that is....
Anyways, the bike is back on the lift and I'm starting tear down today of the rear cylinder. I'll post up pictures of what I find.
Cheers
Hi guys, I Just recently completed a 95" build on my 2002 fatboy. Was running well for the first 20 mile break in ride except for a little dark smoke out the rear cylinder exhaust. Ran smoothly and pulled hard. I assumed it was an air / fuel / leak issue. I did a compression test and got 180psi front and 190psi rear. So I thought all was ok.
Today I fired it up the bike to check for intake manifold leaks and then a LOT of GREY smoke started coming out the rear cylinder exhaust....
Shut it down and then checked the oil. It was very very frothy, and murky dark brown in color. This was fresh oil I put in yesterday.
Could I've done the head gasket? There are no signs of damage / leaking around the base of the heads or top of the cylinder fins??
Retested the rear cylinder compression and it's still bang on 180psi....
Thanks for any advice.
I've never done a head gasket before on a bike or a car....
what do the spark plugs tell you? are they clean or fouled? oil deposit well leave a sign on the tips, comp will be high if to much oil within the cylinders. So, and this is just a question, when installing the rings were they fitted? also, have they seated? again just questions
what do the spark plugs tell you? are they clean or fouled? oil deposit well leave a sign on the tips, comp will be high if to much oil within the cylinders. So, and this is just a question, when installing the rings were they fitted? also, have they seated? again just questions
Was running well for the first 20 mile break in ride except for a little dark smoke out the rear cylinder exhaust
I read half the thread then saw it's from '21,
the second sentence had me raise an eyebrow,
"when a engine is too rich it burns gas first, then oil second",
.
11-06-2021, 10:12 PM
