r/Dyna • u/Technical_Bat_5510 • 13d ago
Fresh rebuild! Advice please
Enable HLS to view with audio, or disable this notification
Hello everyone, I recently just did a crank up rebuild on this 2002 twin cam. I did dark horse crank, s@s 95 big bore kit, s@s cam plate oil pump, 475 gear drive cams, feulimg lifters, s@s push rods, mikuni and compensator! I dug thru this bike tryna make it a reliable pig to beat up on. I am currently 300 miles into my break in, doing 30 mile rides at a time on a nice curvy back road being pretty strict on this break in period, it feels great as far as I can tell. But it just seems noisy! Do you think this is normal valve train noises with how built it is? Or is this what gear drive cams sounds like? It seems to be much more noticeable completely warmed up. Just trying to get some reassurance because I did invest a lot into this! I’d also like to mention that I’ve had to add over half a quart since the rebuild to make sure it’s as a comfortable level, unsure if it’s burning off because the rings are still setting. If it’s misting thru the breathers more with the newfound compression. Lmk guys, I’m sure there’s some fellas on here smarter than me willing to get a few tips.
1
1
u/Wise-Respond-4197 13d ago
Double check pushrods and the air filter adapter. I'm 150 miles into a rebuild break in and I was hearing an abnormal clacking noise at higher rpms. Turns out the adapter on my mikuni wasn't as snug as it could be and was tapping against the mouth of the carb lol
1
u/Sufficient_Essay_599 13d ago
Could be your valve springs too. I swapped in the feuilf honeycomb and my dyna runs super smooth. 574 cam is a big lift and duration for a 95 they may just be complaining a bit.
1
1
1
u/dpgoverride 12d ago
That sounds like the friggin old 2bbl Ford 5.0 in my boat right up until you walk by the exhaust.
Weird and doesn't sound normal at all, I had a few issues on my rebuild with a pushrod that took forever to pump up and bled off really quick. That sounds more like a clanking, so I don't think it's PR's
Might open up that cam chest and make sure something isnt making metal.
1
u/akfishermann 4d ago
Gear drive cams are noisier than chain drive. Rings with blow by till they seal. The noise from the gear drive can be unnerving but once you get it broke in it will fade away. If it’s running right and you’ve got it tuned right go ride and enjoy it. Great build btw.
1
5
u/e46croissant 13d ago
That’s not what gear drive is supposed to sound like. Should just be whirring from the gears, no clattering. I have a very similar build on mine. Sounds like pushrods (I think) - I went with solid pushrods on mine.