Yamaha Star Bolt Motorcycle Forum

Yamaha Star Bolt Categories => Technical Discussion => Topic started by: jtice on July 16, 2021, 10:43:42 pm

Title: Does just doing an aftermarket Air Filter require a tune?
Post by: jtice on July 16, 2021, 10:43:42 pm
I would like to put on an aftermarket air filter just to get some clearance for my right knee.
I am fine with my stock exhaust (I did drill several holes in the rear plate thats under the cap on the tip of the exhaust)

If I just have the drilled exhaust and the filter, do I need to also tune the bike for it to be safe?
Title: Re: Does just doing an aftermarket Air Filter require a tune?
Post by: DrM on July 16, 2021, 11:34:27 pm
Some here will say you do, and some will say you don't.  The question for you is what do you tune?  You don't have a carburetor, but you do have a fuel injection system -- controlled by the ECU.  If you decide you do want to "tune", you only can add a fuel controller or have the ECU flashed, or just leave it alone.  Personally, I have installed a Cobra air filter and a Cobra exhaust, and I don't run a fuel controller nor have I flashed the ECU, nor do I intend to ever do either --and the bike runs just fine.   
Title: Re: Does just doing an aftermarket Air Filter require a tune?
Post by: lunkhead on July 18, 2021, 12:08:07 pm
I got Ivan's old flash running a modified stock airbox. His new flash adds more fuel up top for running a K&N but the Bolt doesn't usually spend much time at red line so you probably wouldn't notice a difference between the two unless you were racing in which running a little lean isn't a good thing. What you will notice with both is better throttle response because no more fuel-cut. The advanced ignition timing another plus. OTOH, I could live with the stock ECU if I had no choice. It's not nearly as bad as some other bikes.
Title: Re: Does just doing an aftermarket Air Filter require a tune?
Post by: jtice on July 19, 2021, 09:29:44 am
I dont have any issue with the Bolts power, yea sure, more is always welcome, but I dont care about tuning it for power, just want to bike running well, and safe.

The only throttle issue I dont care for, it the on/off toggle switch feel of the throttle, especially around town, very hard to eeeeeease into throttle.

The , no more fuel cut off, would that take away my little gurgling under decel? Not sure I want to give that up  haha

I run the bike fairly hard at times, but I dont spend alot of time up around redline, not like you would racing or anything like that.
Title: Re: Does just doing an aftermarket Air Filter require a tune?
Post by: AlphaFury on July 19, 2021, 04:01:58 pm
I would like to put on an aftermarket air filter just to get some clearance for my right knee.
I am fine with my stock exhaust (I did drill several holes in the rear plate thats under the cap on the tip of the exhaust)

If I just have the drilled exhaust and the filter, do I need to also tune the bike for it to be safe?

Anytime you change the amount of air coming into and out of the engine, yes the bike will still "run" if you do not adjust the ECU, as long as you're ok with decel exhaust popping and less than stellar throttle response.  ;D

For me that drives me insane and I hate it. If my bike isn't running perfectly smooth and optimally then it needs to be adjusted, ie having the ECU flashed by a reputable tuner. In the states Ivan out of South Carolina makes the bike run near perfectly. 

1. Fixes all inherent problems with stock ECU which external tuners cannot do.
2. Get's rid of jerky throttle/fuel cut. Makes for much smoother throttle transitions.
3. Complete re-curve of engine timing.
4. Removes stock limiting retarders.
5. Adjust timing for all gears.
6. Raises rev-limiter.

To name just a few. But if you can live with none of these improvements then yes, drill holes in your stock exhaust, put on a aftermarket air intake and then live with all the subtle and not so subtle issues you'll notice when you ride after you do that.
Title: Re: Does just doing an aftermarket Air Filter require a tune?
Post by: jtice on July 23, 2021, 10:29:25 am
I would like to put on an aftermarket air filter just to get some clearance for my right knee.
I am fine with my stock exhaust (I did drill several holes in the rear plate thats under the cap on the tip of the exhaust)

If I just have the drilled exhaust and the filter, do I need to also tune the bike for it to be safe?

Anytime you change the amount of air coming into and out of the engine, yes the bike will still "run" if you do not adjust the ECU, as long as you're ok with decel exhaust popping and less than stellar throttle response.  ;D

For me that drives me insane and I hate it. If my bike isn't running perfectly smooth and optimally then it needs to be adjusted, ie having the ECU flashed by a reputable tuner. In the states Ivan out of South Carolina makes the bike run near perfectly. 

1. Fixes all inherent problems with stock ECU which external tuners cannot do.
2. Get's rid of jerky throttle/fuel cut. Makes for much smoother throttle transitions.
3. Complete re-curve of engine timing.
4. Removes stock limiting retarders.
5. Adjust timing for all gears.
6. Raises rev-limiter.

To name just a few. But if you can live with none of these improvements then yes, drill holes in your stock exhaust, put on a aftermarket air intake and then live with all the subtle and not so subtle issues you'll notice when you ride after you do that.
Mine gurgles under decel, but no real popping, I personally really really like that. So wouldnt really want to loose that, (not a fan of popping though)
I am NOT a fan of the very jerky "on off" throttle of the bike though, that would be the main thing from your list that I would love fixed.
Title: Re: Does just doing an aftermarket Air Filter require a tune?
Post by: AlphaFury on July 26, 2021, 08:10:30 am
I would like to put on an aftermarket air filter just to get some clearance for my right knee.
I am fine with my stock exhaust (I did drill several holes in the rear plate thats under the cap on the tip of the exhaust)

If I just have the drilled exhaust and the filter, do I need to also tune the bike for it to be safe?

Anytime you change the amount of air coming into and out of the engine, yes the bike will still "run" if you do not adjust the ECU, as long as you're ok with decel exhaust popping and less than stellar throttle response.  ;D

For me that drives me insane and I hate it. If my bike isn't running perfectly smooth and optimally then it needs to be adjusted, ie having the ECU flashed by a reputable tuner. In the states Ivan out of South Carolina makes the bike run near perfectly. 

1. Fixes all inherent problems with stock ECU which external tuners cannot do.
2. Get's rid of jerky throttle/fuel cut. Makes for much smoother throttle transitions.
3. Complete re-curve of engine timing.
4. Removes stock limiting retarders.
5. Adjust timing for all gears.
6. Raises rev-limiter.

To name just a few. But if you can live with none of these improvements then yes, drill holes in your stock exhaust, put on a aftermarket air intake and then live with all the subtle and not so subtle issues you'll notice when you ride after you do that.
Mine gurgles under decel, but no real popping, I personally really really like that. So wouldnt really want to loose that, (not a fan of popping though)
I am NOT a fan of the very jerky "on off" throttle of the bike though, that would be the main thing from your list that I would love fixed.

The decel popping will likely increase once you've installed an aftermarket air filter that brings more air into the motor.