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  #1  
Old 27th March 2018
201648Rider 201648Rider is offline
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Default 2016 48 Hesitating

I'm getting some odd behavior thats getting increasingly worse.
When not under acceleration I'm getting some hesitating and a bit of popping almost like a light backfire. Its getting a bit unsafe around corners as ones the hesitation stops it comes back to life.

Its happening almost all time most noticably at low rpms just maintaining speed. It smooths out once I add a bit of throttle.

I've got a thousand miles or so on my 1275 kit with dynotune and I'm not getting any error codes.

I plan on pulling the plugs tonight. Any other tips on diagnosing? I've ran through about 3 tanks and tried some different fuel stations but all seem the same.

I've also been data logging alot but I've never done anything with my logs. I guess its time to start getting familiar with the software side of things.
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  #2  
Old 27th March 2018
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Check for intake leaks.
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Old 21st April 2018
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Pulled things apart last week and dropped some plugs in. Big improvement initially but its slowly coming back. At very very light throttle its like its stumbling then the power snaps on if you juice it a bit. Put the dynojet on and noticed its usually around 10% throttle when not under load.
Any other tricks to troubleshooting without any error codes?
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Old 22nd April 2018
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did you check for intake and exhaust leaks? If not you should start there.

Andy
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Old 22nd April 2018
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this is very common when idle jet, air mixture screw and idle speed settings are not correct. These settings must then transition to needle and needle jet as you open the throttle to mid range. Set the air mixture screw and 2 1/2 turns outs, idle at 950 rpm. Do the plug chop method to check plugs at idle and mid throttle. If they are not close to perfect, change idle jet or needle. If they are close, then work with idle mixture screw to find the setting that stops the hesitation. I wrote a sticky on this 10 years ago. There are other good carb tuning threads in the sticky section.
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Old 25th April 2018
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Andy_t I pulled the intake ff and reseated everything, checked all wiring and reinstalled the aircleaner and put new plugs in. Things seemed smoother for a few days but im now back where I started. I need to get an adapter for my compression tester to rule out a leaky head gasket.
Whats the best way to track down an intake leak?

Xlxr fortunately/unfortunately im on efi so no carb tuning on my end
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Old 25th April 2018
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I had a similar problem on my 2012. I believe it is caused by a lean mixture. The motor company builds these to be compliant with epa regulations, never mind if the result is poor performance. The fact that you have had motor work done may be contributing to your symptons. If you can find a competent tuner, they may be able to help. In my case, I tried three different cures, and was about to unload my bike before I got it cured. Good luck with yours.
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Old 25th April 2018
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Quote:
Originally Posted by 201648Rider View Post
I've also been data logging alot but I've never done anything with my logs. I guess its time to start getting familiar with the software side of things.
Quote:
Originally Posted by 201648Rider View Post
Pulled things apart last week and dropped some plugs in.
...
Put the dynojet on and noticed its usually around 10% throttle when not under load.
Quote:
Originally Posted by 201648Rider View Post
Andy_t I pulled the intake ff and reseated everything, checked all wiring and reinstalled the aircleaner and put new plugs in. Things seemed smoother for a few days but im now back where I started. I need to get an adapter for my compression tester to rule out a leaky head gasket.
Whats the best way to track down an intake leak?
What tune are you running? Is this a Hammer 1275 kit with a Hammer tune? Is this with a PowerVision tuner? Have you done any autotuning? You don't have an autotune map loaded by accident?

I agree with others to check for an intake leak. You mention taking the "intake ff " and reseating everything, I'm not sure what "intake ff" means. The intake leaks that present issues are typically between the intake and the engine intake port. Personally I have found intake/sensor cleaner sprayed around the head ports/intake seals will show a drastic change in idle if there is an intake leak.

Ensure the tune you are using has the correct gearing and speedo adjustments (compare current map to the original stock tune, presuming you haven't made any changes to the gearing). If the ECM/tune has the incorrect gearing values, it can impact idle while moving.
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  #9  
Old 25th April 2018
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Screw Loose Dan thanks for the advice,

Confirming its a 1275 kit with 560cams, exhaust, and intake. With the tune being provided by hammer for that configuration. I've put about a thousand miles since the upgrades with no issues and only started having the hesitation recently.

I haven't intentionally changed anything with the tune since then, but I'll try re-installing the map they sent just to be sure.

Apologies for the type-o (was on mobile) I pulled the intake and air-cleaner assembly off, meaning the entire throttle body and intake runners off the jugs and reinstalled. I had not tried the intake/sensor cleaner trick but I should try that next. I should also note that I think the hesitation went away for a day or so (at least it improved) so perhaps the intake is just not seating properly.

hammer6315,
Thanks for the tip. I still plan on a proper dyno tune once I locate an experienced reputable tuner in my area, hopefully I can get this issue sorted prior to that.
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Old 26th April 2018
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Did you reassemble with the original intake seals? They are rubber and in theory should seal multiple times without issue. However, many of us consider them a regular maintenance item. It's also generally recommended to use a lube/grease on the seals during reassembly.

I'm not trying to indicate that an intake leak is definitely your issue, but they are generally easy enough to eliminate, it's a good place to start.

FYI - I found the intake cleaner worked well for finding an intake leak when cleaning the intake on a running bike and realizing it made the bike quit running immediately upon spraying it in the intake. When sprayed around the leaking intake seal, the bike quit running immediately, just as if I had sprayed it in the intake.
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