05 arctic cat 500 bogg

[joshramsay]

hi

gunna start by saying i got this on trade and was not informed of any mods

this is gunna be a little long but really need help ive been struggling with it alot

i found out for my self a dyno jet kit was installed

ok so atv starts right away idles great when im riding in ANY gear EXCEPT 1st 
if i go to hammer the throttle the atv starts bogging it wont die it will just bogg till i let off the throttle and slowly climb up the rpms again for example...

im driving in 3rd shift to 4th and snap the throttle it bogs but if i shift to 3rd and slowely use throttle it runs fine

the other day i went to go climb a short hill not very steep or long in 3rd gear 
and just when i got to the top almost it stalled i tried again in 2nd stalled again put it in 1st LOW and it climbed right up 

today i went riding in some water (its snorkled and sealed verywell no water is getting in)

and i cannot go through tire high water in anygear other then 1st it will just bogg and almost die in 1st it powers throught the watter BUT i did a water wheelie in 1st and just as i reached the peak of the wheelie it bogged in the water and i couldnt throttle without a bog till i got out oof the water...


my carb is spotless ive cleaned it 10 times jets arenot plugged i can see light through every one diaghram is not pinched or poked 

my PMS screw is 3 turns out as advised and my needle clip is 3rd slot from the top 

battery is fully charged and not over charging i checked..

so im thinking 3 things

1 carb is running out of gas when snapping the throttle or going through mud or water or haveing any type of load ( dosent sound right to me though)

2 main jet to big stock says 138*with pump ..im running a 144

3 maby my clutch is not good any more ? i dont know...


at this point im lost if anyone at all has some info id apreceate it i should be able to have low end power in 2nd 3rd and 4th depending on what im doing but i have no low end power in any gear other then 1st ...

and my top end is suffering while trying to quickly accelerate

 

 

[davefrombc]

My  best guess   would be  to  go  with the stock  jet. In the  good ole days  of  carburetted cars  those symptoms  would  point to  a faulty  acceleration pump.  Sudden  opening  of  the  throttle  causes  a  drop in vacuum  and with it    a momentary starving of  fuel . That's  where  the  accelerator pump  gives  it  a shot  to make  up  for that  momentary   starvation ..  It  could be  with the  larger  than  normal  main  jet  and  air screw opened   up ( most   of them  work  best  around  1  1/2 to 2  turns  out  from  seated ) you are  getting that  vacuum  drop  and  fuel  starvation when  you  suddenly  open  it  up.  By opening the throttle  slowly  you  don't  lose the  vacuum and fuel  delivery.

[spigmef]

Is the choke automatic, they were made very poorly and die very often. It works by letting more fuel into the carb. This will make it bog down. I had this problem on my 400. A new choke is $300, you can disconnect the choke and flip a spring around in the choke to fix it. This will make the choke be stuff off though. 

Edited October 2, 2017 by spigmef

[Admin]

Topic moved to Arctic Cat ATV Forum.