Thanks for the info! I'll give it a trya #58 is waaay too big
This is where you should be with jetting (match it to your elevation)
Jetting Guide for Main Jet:(pilot 45) CRF450R/X
One main jet size (up/down) for every 2,000 feet or 25 degrees in temp.
Stock jetting for the 06 450R is
For Starting ..... Turn on the gas , and pull the choke , twist the throttle about 6 times , put your foot on the kickstarter , and slowly push it down all the way , do this several times till you feel when it is on the highest compression , then do it 1 more time , as soon as you get to the spot where the compression is highest , let off the kickstart and let it come all the way up , then give it a full HARD kick from all the way up , like you are trying to kick a Harley , it should start right up , if not do the same procedure again ..... ALL this is pointless if you do not have the jetting and carb settings to what is on the list ........ use a #45 Pilot , the most would be a #48 , but it should run with a #45 Pilot and the fuel screw set to what it is in the picture I posted , which is right out of the 06 450R Honda Owners Manual
Also very important .... If the bike sat for several months with the same gas in it , then most likely it has gone bad ... these bikes like FRESH gas , Premium and preferably Non Ethanol , as Ethanol gums up the crab and cloggs the jets and internal passages , do not spray carb cleaner in the carb with it all together , including the Fuel Screw , it must all be removed (make sure you get the fuel screw , spring , washer , O-ring , all out before spraying any carb cleaner or it will destroy any rubber , this also includes the Floating Valve Plate Seal on the slide (you have to remove the slide to remove or replace the slide plate seal) ......
Report back with results ...
Thank you for the advice. I did find that the accelerator pump is not pushing any fuel into the engine. I did actually use some carb clean and compressed air along with a new accelerator pump kit from Honda. While I did this I also did the zip tie mod. Now it does want to start but wont stay idling and pops out the exhaust.. I have a 45 pj 168mj and on the 4th notch of the NJ.Your large "bug sprayer" jets are covering for a dirty or clogged carb. There isn't a CRF 450 anywhere that won't run with a 45 pilot, fuel screw at 2.0 turns out, and a 162 main. We can fine tune from there, but any of them with any exhaust, any altitude, any compression ratio will start and run.
So...There is probably some goop in the top of the pilot jet channel and fuel screw. Compressed air, a blast of carb cleaner, a metal dental pick gently wiggled up in the top of those passages, more compressed air, I suspect will start clearing things up.
No need to remove the carb. Drain some gas out, and lay the bike down on the right side. Loosen the carb retention clamps, swivel the carb bottom up towards the left side, remove the 17 mm plug, and this can all be done in less than 10 minutes.
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