As some of you remember when I was at 4SW II I ran my bike on the dyno with two different air filter setups ( K&N carb mount and a Uni on the end of an intake tube 2-3/4" ID) Well the K&N carb mount made 4 more HP on top. My intake tube was about 15" long with a 2-3/4" ID opening on the carb side and tapers to a 3-1/2" opening on the filter mount side. I thought maybe it was the Uni so I orderd a TRX250R K&N clamp on filter ( This filter has a 4" opening) for the intake tube and tried it again. I am still losing top end HP[img]i/expressions/face-icon-small-mad.gif[/img]. Could it be I am getting more air and running lean or is the TM-45 made to run with a carb mount setup?Please Help!!!! Thanks..

 

Did you Dyno the 2 set-ups on the same day??




Biggerisbetter.

 

The 2 runs were about 3 mins. apart

 

Is the snorkle intake in the airbox?? or is the filter in the open?? I would think the stock snorkle with an exposed air filter would be just as good if not better than a Carb mount filter.




Biggerisbetter.

 

It is a custom made snorkle (PVC) and the filter is out in the open.

 

Filter schmilter! I'm going to just run with no filter and see how fast I can go before the motor craps out![img]i/expressions/face-icon-small-happy.gif[/img]

Juuuuust kidding..
SD

 

Check your jetting. K&Ns flow way better than foam filters, you are probably lean on top now.

 

BIGBAJA i would like to know why you put your filter on the end of an intake tube,why not directly on the carb,just want to know..

 

Because the seat keeps rubbing holes in my carb mount. Also it helps keep my 45mm carb in place.

 

Why the homemade tube - why not try the stock intake tube, with the airbox lid off and the snorkels removed? i know they collapse a little at high rpm, but you can help prevent that with large hose clamps places between every other rib of the intake tube. I'm just curious if it would make a difference.
You could also put a Uni filter direct on the carb - it wouldn't be hurt by the seat. just put some cloth tape at the rub points of the outerwear to keep from wearing holes in it.