need help!

[2stroke_addict]

i am having problems with my banshee and i need help before i spend a lot of money on repairs so here it goes:

 

2003 banshee with the following mods:

-toomey 6 pipes, including jet kit

-K&N filter

-V-force reeds

-boost bottle

 

the problem:

poor low-end and midrange power then the high-end kicks in fine, not very good response until it hits high-end, funny thing is that a couple of weeks ago it was fine, and yesterday it started doing this.

a few months ago i discovered a very fine layer of sand past the filter but it kept working fine, now, did the sand took this long to take it's toll??

Now my guess it's that it probably needs top-end rebuild, due to loss of compression, altough it has 115 p.s.i in one cilinder and 120 in the other, the mechanics at the dealer say it's fine and yet it feels otherwise.

 

can anyone tell me what causes this powerloss?? thanks

[neilgf]

Has there been any change in air temp?

[svtkid78]

Where are you from. Did the temperature take a big change. Is your filter clean. You have good plugs in there, and what do they look like. Drive it around at the speed its giving you problems at then kill the engine and look at the plugs. Also that thin layer of sand is because you have a K&N. they are good filters for airflow, but are bad dirt stoppers. Go foam.

[RNBRAD]

It could be your compression, those numbers are a little low. Looks like around a 10 to 12% drop in compression which will drop your low to mid power by 10% so you could be feeling a 4 to 5hp loss in that range, this will not be as evident at higher rpm such as you are experiencing. I'm unsure of your elevation with these numbers and your quads state of tune prior to these symptoms which it's always good to have a basleline to look at. Make sure to take initial compression readings so you have something for a comparison for later reference.

[2stroke_addict]

Where are you from. Did the temperature take a big change. Is your filter clean. You have good plugs in there, and what do they look like. Drive it around at the speed its giving you problems at then kill the engine and look at the plugs. Also that thin layer of sand is because you have a K&N. they are good filters for airflow, but are bad dirt stoppers. Go foam.

286354[/snapback]

 

live like 30 miles from glamis, and yes you are correct there have been temperature changes, it's cold but i understand it runs better on cold temp, the plugs are new, the filter is clean, the problem however is in the powerband, it doesn't matter what gear or speed. for instance if i'm in 3rd gear and want to shift to 4th i have to rev the hell out of it to keep the power, otherwise it bogs down and i have to push the gas until it snaps in the high-end rev range again.

[boonman]

Sounds like it's lean. Revving, and no power indicates that. If you have an airbox, try throwing the lid on it. If not, jet richer by one or two sizes. What do the plugs look like? Also, clean the carbs thoroughly...