450r Knocking at low rpm

[mattonln]

hey, I'm new to 4-strokes so I need some help.. I ride at the dunes alot and whenever my 450r is under a load going up dunes at a low rpm, it knocks, or sounds like it... is that normal or am I starting to foul a plug? I have just the HRC spark arrestor tip on... do I need to rejet? will going up 1 on the pilot jet fix this? also whenever I start up my bike and let it run on choke for a couple seconds, it pops..... I think i just need to rejet, but I'm just seeing what other folks say.... any input would be great!

[LazeR]

My 400ex kinda sounds like its knocking if im lugging it to much, when it does that try downshifting. and see if it still does it

[mattonln]

yeah, if i downshift, it goes away immediatly, I guess its just under too much load at too low of rpm..... I was just making sure something wasn't fcked up on my new bike!!! how old are you, lazer? do you know a chick michelle bolduc? she's a junior and used to go to bandon? anyways if you ever come down to the coos bay dunes, hit me up with a pm and I'll get a few friends together and we'll show you some cool places to go.... anyways, thanks man

[TRX450rRoostin]

try goin to a 13t front sprocket....that happend to me...and the 13t help it out a lot

[Jersey450R]

yea i was going to say the same thing. try a 13 tooth up front for the dunes.

these engines dont like to be lugged...you have to rev them hard & go fast

[mattonln]

thanks, the 13 tooth really helped!

[zracerx]

Try a higher octaine fuel.