bought 06 YZ450F


22 replies to this topic
  • asg5265

Posted August 09, 2010 - 06:37 PM

#1

So I bought this bike for 2100 bucks.
here some stuff that came with it
JD jet kit
two bros full exhaust
excel wheels???Were these stock that year?
full iron man sprockets and regina chain
some zeta levers
Other than that is has OEM plastics and all that cool stuff.
So first thing I did was start it up, it actually started! I rode it around a little. it was poppin on decel and doing all kinds of evil stuff. So I know what to do and I check the valves and timing, one valve was way off on the intake .35! .15 is max spec!!! So i shimmed that one, the rest were fine. The timing was OFF THE EFFING WALL!!!! I set the flywheel to TDC, looked at the cams and each were off at least 8-10 teeth! couldnt believe it even started let alone ran. So I fixed those. Just thought I would tell the story. lol Do I need triple trees for this bike? Anything else to know? Also this one has the Ti shock spring??

  • twomancrew

Posted August 09, 2010 - 08:23 PM

#2

Cannot believe it was off 8-10 teeth and did not contact valves. Very lucky. If timing was off get a new timing chain and maybe a new tensioner. Steering stem bearings usually need attention. Are you track or trail? Excel was stock.

  • sacfelix

Posted August 09, 2010 - 08:38 PM

#3

It does come stock with a ti rear spring.

  • Steel Panther

Posted August 09, 2010 - 11:02 PM

#4

Id change that timing chain and tessioner asap as I dont think its possible to assemble the bike with the timing that far off. How did it run after you changed the timing and shimmed the valve?
Its a great bike, I think these years turn just fine however, many people swear by the 22mm offset clamps.

  • asg5265

Posted August 10, 2010 - 06:33 AM

#5

The tensioner and chain seemed good, the bike doesnt have many hours on it, I can tell by checking all the bash and smash points on the thing. Anyway, I checked how far out the tensioner was and it wasnt out far, around half way. I havent gotten to start it because I dont have an airfilter, I will go get one temporarily while Im waiting for my order from RMATVMC. With the timing fixed and valve adjusted, this bike should be a champ. thanks for the responses and tips guys. I just wanna test it tonite on an MX track for like 20-30 mins.

  • STROKEDIESEL

Posted August 10, 2010 - 06:42 AM

#6

are you positive the valves and timing was that far off? did you use a manual? have you started it yet since you made the adjustments?

  • asg5265

Posted August 10, 2010 - 06:56 AM

#7

dude I am absolutely sure they were off that far. this is not my first rodeo here doing valves. I have done them before and have never had a problem. I brought the piston to tdc, then checked marks, simple. They were off so I fixed them then checked the valves. only one was off, really off, the others were fine. The thing accelerated well though, I couldnt believe it when I saw how far off the ccams were. like I said it was popping backfiring doing all kinds of terrible stuff on decel. I tried the fuel screw and that didnt help at all, so in my head I was like timing! it was also very chatty and loud when idling, so I was like the cams valves need attention.

  • asg5265

Posted August 10, 2010 - 06:56 AM

#8

I followed the manual step for step. no start since, dont have an airfilter yet.

  • STROKEDIESEL

Posted August 10, 2010 - 09:29 AM

#9

i'd replace the chain and tensioner before it jumps again on your next ride. i understand the not your first rodeo thing but it ran before and now it doesnt. there are several marks through the hole. hope you get it sorted out.

edit:maybe you havent tried to start it yet since you dont have an airfilter yet. hope it runs great but i'd still replace the chain and tensioner.

  • Luigic81

Posted August 10, 2010 - 09:58 AM

#10

my '06 needed the shift stopper part update, steering bearings, and fork seals (all common for these bikes) I went ahead and replaced the cam chain too as some had instances on slipping time (like yours) For $25 you really should replace that cam chain

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • Mr. Neutron

Posted August 10, 2010 - 10:41 AM

#11

my '06 needed the shift stopper part update



Hey, Luigic81!!!

Is this shift stopper that little spring loaded arm that has a roller bearing that sorta indexes the shift drum? :banana:

My ridin' buddy has an '03 or '04 (steel frame) YZ250 2-stroker. That part I attempted to describe above had the roller bearing come apart, and went all through his tranny, wreaking much havoc..... ;) It took out several gears, a shift fork, & such..... It scares me to think of what it could do to one of our bikes...... :eek: This is the first I've read of such deal on the big thumpers..... Would anyone have a part number for the updated part?

Jimmie

  • asg5265

Posted August 10, 2010 - 11:34 AM

#12

i'd replace the chain and tensioner before it jumps again on your next ride. i understand the not your first rodeo thing but it ran before and now it doesnt. there are several marks through the hole. hope you get it sorted out.

edit:maybe you havent tried to start it yet since you dont have an airfilter yet. hope it runs great but i'd still replace the chain and tensioner.


I got my RM250 air filter on the thing. it fit right on there!!! the cages are almost identical except the dumb screen. I started it and low and behold it spit out a lot of oil out one of the cavities for the oil filter. So I took out the damaged oring and put in 2 good ones. So I have to start it since because its that time of day when ppl in the community are out. So later like 1 or 130 ill restart and see whats up. other than it started, ran I just didnt get to ride it

  • Luigic81

Posted August 10, 2010 - 12:11 PM

#13

Hey, Luigic81!!!

Is this shift stopper that little spring loaded arm that has a roller bearing that sorta indexes the shift drum? :banana:

My ridin' buddy has an '03 or '04 (steel frame) YZ250 2-stroker. That part I attempted to describe above had the roller bearing come apart, and went all through his tranny, wreaking much havoc..... ;) It took out several gears, a shift fork, & such..... It scares me to think of what it could do to one of our bikes...... :eek: This is the first I've read of such deal on the big thumpers..... Would anyone have a part number for the updated part?

Jimmie


new part # 2S2-18140-10-00

  • Mr. Neutron

Posted August 10, 2010 - 12:27 PM

#14

Thanks, Luigic81!!! ;) :banana:

Sorry about the thread hijack, asg5265! :lol: Glad you got your bike to run, and it's nice to know about the RM filter fitting..... :eek:

Jimmie

  • asg5265

Posted August 10, 2010 - 12:46 PM

#15

so now its popping and not responding to idle adjustments barely. OH JEEZ! I want to think its jetting because the motor does not like to wind down and has a hanging idle. Im thinking spark plug, fuel screw that has no oring, or a loose jet the pilot that is. I will investigate after I get fresh gas and a new fuel screw.

  • sacfelix

Posted August 10, 2010 - 07:46 PM

#16

Whats the current jetting?

  • Wiz636

Posted August 11, 2010 - 07:55 AM

#17

...and it's nice to know about the RM filter fitting..... :banana:

Jimmie


At one point I had an '02 YZ426, '02 YZ250, '03 RM250, and an '06 YZ450 and they all used the same air filters. Just one of those little things that makes life just a little bit more simple. :eek:

The chain guides were all interchangeable also if I recall correctly.

  • Luigic81

Posted August 11, 2010 - 07:55 AM

#18

Good question, these bikes are also notorioiusly lean from the factory. I'm at sea level and its been about 80-85 degrees here, I'm running 165 main, 48 pilot, stock needle position, FS about 1.5 turns out, ap timing screw is wired, also had to turn it CCW about 3/4 of a turn to get rid of bog, stock leak jet

  • asg5265

Posted August 11, 2010 - 08:16 AM

#19

42 pilot, cant remember the main, I think its 168, my 250f just started making another noise last night...Im almost done doing the work myself

  • Luigic81

Posted August 11, 2010 - 09:50 AM

#20

42 pilot, cant remember the main, I think its 168, my 250f just started making another noise last night...Im almost done doing the work myself


put a 48 pilot in, and start around 1.5-2 turns out on the fuel screw, your popping problem should be fixed.





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