When my 2001 indy 500 idles i have a knock

check where the cable enters housing to see if it is adjustable.

Did a lot of rambling around and cannot find anything on the 500. Found the 400. Since the smaller 400 is a wet clutch, I'm guessing the 500 is also, so your selection of oil needs to be one that supports a wet clutch. The 400 brochure tells you to be sure and not mix additives and odd oils into the system. Lucas makes motorcycle oil compatible with wet clutches (others too, but make sure you check) The 400 used 10 or 20w/40 depending on outside temperature.
I don't think you will be making a serious error following the 400 recommendations.
Here's the link


http://www.bennche.com/uploads/product/17_5.pdf

I take help from online websites that have this service like helping in repair some like reliable-store have instant help.. others are a bit slow which I don't prefer... rest is up to u.. U can also get free manual works fine .

Could be a handful of things; 2 that you could check and let me know what the outcome is will narrow it down -

1. When was the last clutch replacement done on the bike if any? When your clutch starts to go - one of the symptoms is loss of power at take off.

Here's something you can do and I believe the 350 had a basket as well as a centrifugal clutch if you have an adjustment - there should be a nut on a stud on the front cover of the engine. Front Housing is what it's called. You can't miss the stud - it's on the engine cover that faces forward. That's your clutch adjustment. Hold the stud stationary and loosen the nut - should be a 10 or 12mm - once the nut is backed off - loosen the stud - then go counter clockwise slowly until you start to feel resistance - once you feel resistance - go forward about a 1/4 turn.

That's a standard clutch adjustment for multiple makes & models especially the Foreman, etc. I've got a 2000 TRX450 and that's the clutch adjustment*. If this atv has the hondamatic - or no clutch adjustment stud/nut - I'd pull that front cover off and check the tolerance on your centrifugal clutch.

2. - every 6 months or 500 hours they recommend you check and adjust your valves as needed. No one does it and the valves get out of whack. What could possibly be happening - your valves need adjustment - when you start the bike and until it's really warmed up performance will suffer. Once they bike warms up, heat makes everything expand - and if you're on that threshold - you'll run terrible at first/better as the valves warm up. You'll see this play out everytime you get on it and it hasn't been running in 20 hours.

Could be a carb issue as well, your idle and slow jets could be getting clogged up. Or your pilot screw's o-ring is shot and you're drawing too much air at idle/slow speeds and evens out under demand. Once that happens - you'll probably idle okay/nothing great - putting around will be about the same - but when you're on full throttle your carb pulls from a different jet. Each jet has a job - idle jet, slow jet, fast jet, - if you haven't cleaned the inside of that carb out in awhile - now is the time to do it - if nothing else, you'll have a clean carb and you'll have that knocked off your list.

These aren't the only causes by far - there's a flow chart attached/it's from an 04 TRX400 - Same rules apply. I didn't touch on electrical - but if you check on the things above/need any tips going through the flow chart, etc. feel free to shoot me a message. Glad to help if possible.


All The Best, Justin Lee, 17 South Industries, LLC

Hey Anon,
This sounds very serious..Unless you are a VERY GOOD mechanic, you need to take this machine to a qualified professional..it will be best in the long run...

Well Cindy let me ask you was it doing it since you got it ? or it just start doing this ? just so you keep in mind that since you dont have battery in idle can be less power into the bulb filament now when accelerate creating more power meaning more light on bulb...

Sounds like clutch adjustment will see if I can find directions

Buy yourself a factory parts & service manual,
at a dealer that sells those atv's & use the trouble
charts contained
You should have some type of owners manual on
basic checks,such as clutch adjustment ,etc

sounds like you have an air leak on the intake somewhere

Check spark plug, that sounds like it's running little too lean.