i recently had a set of andrews 57h cams installed into my 2016 fxdb along with pushrods and lifters. the bike was dyno tuned here in brisbane, and after a few hundred km's of getting used to the setup, the bike's performance and ride-ability in the lower rpms is shocking. at around 1800 to 2300rpm (1st or 2nd gear) the bike convulses and bucks terribly. i don't make a habit of riding in this range alot, but it can't be helped in slow peak hour traffic where i can't lane filter. one minute the bike is going to stall, next minute it's surging...all while holding the throttle steady. in higher rpm's of 3000+ the bike runs great, and pulls hard as expected with these cams. but even when moving off the line the bike really bogs down and feels like it's going to stall...almost like i'm taking off in 3rd. i had another mechanic ride the bike and he said he's never felt low down bucking like that before.

the tuner believes it's the exhaust causing the issues (two brothers 2 into 1) and of course after writing to two brothers they blame the cam choice. the tuner told me that the bike had to be tuned really lean, with a bunch of timing adjustments just to get it to run decently. i trust him as a tuner, and feel that he's doing the right thing by me and the bike. 

the bike feels as though the performance is getting worse and it's going back to the tuner for a once over next week. i haven't come across any bikes with this cam and pipe combo, but have any of you guys had any issues similar to this after a cam upgrade?

a summary of what's been done and tested:

- installed andrews 57h cams

- s&s pushrods

- feuling lifters

- dyno tuned with powervision

- new spark plugs

- new tps sensor

- new exhaust gaskets 

- compression test - 175psi in both cylinders

i know that the 57h cams are a mid range cam, but surely it shouldn't be such a turd low down. hopefully someone here might have some insight or experience.

Ring and speak to other tuners and ask how they would set up the bike with CAMS/Exhaust etc. it's always good to get a second opinion.

the gremlin that really get me is...the bike is running really lean, yet it smells really rich and i've gone through half a tank on two return trips to work (20km each way). i know cams can affect consumption, but surely not like that.

compare your stock map to tuned map, try a map from powervision

- there is no exhaust leaks - held an incense stick around both exhaust ports and the smoke wasn't blown around by a leak

- plugs are gapped correctly - but are white/lean.

the bike started a bit stronger when back together, but the bucking/surging etc. was obviously still there. i decided i'd try to autotune it, and rode around for 40 mins in the rev range that's been giving me trouble. took a look at the autotune results and it made the bike even leaner in the 0,2,5% columns of the ve tables. 

maybe the oem cams should go back in until i can find a better marry/combo of parts....or an exorcism.

Most corrupted place getting around

initially they were going to do an exhaust swap to rule out my 2into1, but went with a compression test first up. he only got 160ish psi in both cylinders, which set off alarm bells. they pulled the bike down and found that they had installed the cams off by a tooth, throwing the timing all out of wack. everything was redone, and re-tuned, and the bike has gone from 92hp/100tq to 98hp/111tq with 200psi in both cylinders.

like i said, i won't know until i pick it up and ride it, but over the phone at least it sounds like it's sorted. :)