Suzuki VL 250 air intake

[1 Free Man]

Question????????
My VL has rubber tubes on the air intake side of the Filters. The tubes feed into what I will call an airbox. The diameter of the tubes is 16mm. The tubes have a grommet type fittng on them that goes into a 32mm hole in the end of the air box. I appears to me that the design of these tubes is choking the air supply. Surely the better the engine can breath the better it will perform.
If I remove the tubes, which is real easy ya just have to pull the grommet part out of the hole, It appears that the motor performs much better.
The question is" Will it have any detrimental effect on the motor???"
The effect so far appears to be a positive one.
All Ideas and input appreciated.:niceone:

[MSTRS]

An airbox has 2 functions...
1. Somewhere to put a filter
2. It creates an area of neutral air. Means the engine draws an equal amount through each carby and also even pressure (no turbulence) within the throats of those carbs.
Engines will usually run the best when the mixture is lean, but not quite lean enough to cause overheating issues. Sounds like, by removing a restriction to the airbox, you have created gearter airflow, therefore leaning out the mixture the engine gets. If you have no heat issues, then leave it as it now is.

[slimjim]

also lad.......... the stage you start alterating these rudders ,could allow dust sand size grit into thoart tube of carbs... humm want more air flow change airfilter to a k/nfilter ...

[MSTRS]

If you are happy with it now, and it doesn't overheat or otherwise cause 'issues', then leave it alone. Further dicking with it will mean that you will be getting into jet-changing territory. It's not worth it.

[1 Free Man]

An airbox has 2 functions...
1. Somewhere to put a filter
2. It creates an area of neutral air. Means the engine draws an equal amount through each carby and also even pressure (no turbulence) within the throats of those carbs.
Engines will usually run the best when the mixture is lean, but not quite lean enough to cause overheating issues. Sounds like, by removing a restriction to the airbox, you have created gearter airflow, therefore leaning out the mixture the engine gets. If you have no heat issues, then leave it as it now is.
Thank for your feedback. being somewhat "Challenged" when it comes to Motorbike stuff I am going to ask some dumb questions.
Because the tubes are on the outward side of the air filters will the air filters not even out any turbulence?
Now here's the real stupid question.
How will I tell if I have an over heating problem.
With the motor being air cooled of course and with on temp gauge to refer to what should I be on the lookout for??



also lad.......... the stage you start alterating these rudders ,could allow dust sand size grit into thoart tube of carbs... humm want more air flow change airfilter to a k/nfilter ...
Point taken. The rubber tubes are on the out side of the filters so the grit issue is taken care of by the filters. K&N filter. Yes I'd love to be able to get them for the VL. Had one on my last cage and I swear by them.


If you are happy with it now, and it doesn't overheat or otherwise cause 'issues', then leave it alone. Further dicking with it will mean that you will be getting into jet-changing territory. It's not worth it.
With you on this one. Last thing I want to do is get into Rejetting and all that shit.
Re over heating questions as per you first post.
Yes I am happy with it with the tubes removed. It appears to have a bit more PEP which can be felt for sure, but I will put them back on if I am going to do the motor any harm.
It's my first bike and I want to be able to trade it soon but i don't want to have it shite it's self in the mean time or get that hot that it blues up the pipes or stuff like that.

[MSTRS]

Allowing slightly less restricted flow into the airbox is unlikely to cause great heating issues. Especially since you are leaving the filter in situ. Being an aircooled engine, you just wouldn't want to work it too hard for long periods, on a hot summer's day.

[1 Free Man]

Just an update on taking these tubes out.
I have clocked the bike at 270km reserve to reserve on two different occasions. First tank was a mix of around town and a little open road.
The second tank was mostly open road and a little round town. I got an extra 20kms per tank.
More than happy to stretch the dollar a little further.
Bikes running sweet No apparent problems so far.:niceone: