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Message started by Wake51 on 05/14/12 at 23:57:45

Title: Slight Pop on Shift
Post by Wake51 on 05/14/12 at 23:57:45

I wanted a 2nd oppinion on my tuning. I know it's near impossible to illiminate the burps and brips from any bike more or less our beloved thumper.

I'm running an HD Dyna muffler and K&N Cone on the carb jetted at 55 w/ bleed holes pilot 152.5 main & 2 turns out. I have a very slight leak at the muffler exhaust joint that I've been unsuccesful at removing even with the tin can method and a bit more packed in there. I know a few decided to run with a slight leak.

When I ring the engine out a bit (not WOT) I will occasionally get a pop when shifting through 1-3. Don't get it 4-5. Do others get this pop? It's very mellow. I don't get it when de acceling or reving. Just on the occasional shift. It seems to scale with the rising temperature of the day.

As of now I just wrote it off as a side effect of the exhaust leak that I'm unable to fix at my current skill level. Was just wondering if anyone else got this running the same set up.

Title: Re: Slight Pop on Shift
Post by Routy on 05/15/12 at 05:43:53

I would think everyone could have that running any setup. These bike are known for doing it all,...... doing everything unpredictable as far as pops, rattles, and afterfiring. Many here have given the false asumption that all the backfiring can be elliminated. And many times it can be, but,.....probably only till the next time out, or the next temperature change, or the next tank of gas, or the next change in elevation, or even something as serious as not holding your mouth right !
If mine ever quits popping, rattling, backfiring, afterfiring, or any......or all of the above ......whatever...., I'll know I have a problem.
And tuning a bike to get rid of backfire is just plain wrong !
Every engine should be tuned to run correctly,.....and effeciently at all speeds.....including idle.
Many a carb has been hacked (ruined?) from tuning to backfire.

Title: Re: Slight Pop on Shift
Post by justin_o_guy2 on 05/15/12 at 06:00:33

A little burble or pop at shift is no biggee,, not that handy in a hospital zone, I like the noises this big single makes, even the grumblings on decel & pops between gears,

Title: Re: Slight Pop on Shift
Post by AlphaBarney on 05/15/12 at 14:56:09

Have that same exact issue. Don't let it bother me though. If anything it keeps the cars aware I'm next to them, or passing them 8-) that is.

Like Routy said above a carb should be tuned to run well. No choke on start, idles well, and runs well under throttle. I'll take that over a couple pops occasionally.

Title: Re: Slight Pop on Shift
Post by Realbtl on 05/15/12 at 15:37:59

This is reassuring to know. I just put a Dyna on my bone stock 07 and noticed the same thing, slight pop/rasp on shifting. No decel backfire to speak of, occasional fart/pop on shut down. I'm at a bit over 3000' and I think I'll get by w/o re-jetting.