300ex valve adjusting - Honda ATV Forum
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post #1 of 31 (permalink) Old 02-23-2010, 07:50 PM Thread Starter
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300ex valve adjusting

Alright i finally got my jetting correct and everythings good there but now the valves are tapping more than i ever remember them doing before. I thinks its cuz i ran it way lean for just a little bit but refresh my memory what are the specs for adjusting the valves?

07 416ex
Wiseco 87mm piston(fly cut for clearance)
Stg 2 magnum cam
Kibble white +1 valves (high rev springs+titanium retainers)
Crf450 t-chain
Cometic gaskets
Gt thunder hd studs
EBC DRC Clutch
PRM skid
Hmf full pipe
UNI filter + ehs powerlid
45 pilot, 1 3/4 turns, middle clip, 190 main
razr XC tires
Team Alba (bumper,nerfs,beadlocks,+2 lt arms)
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Msr ez pull lever
Oury grips
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post #2 of 31 (permalink) Old 02-23-2010, 08:01 PM
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.004 Is what the 250X are and the 300EX is basically the same, pull the timing plug out rais and support the rearend I usually put mine in 3rd or 4th so I can bump the wheels around by grabbing one and turning it line up the line above the "T" and start adjusting. good luck. oh and when you get it to the "T" you may have to hold the tire in place you can try to get it to neutral without it moving but not likely. an extra set of hands will be a good thing.

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00 TRX400EX aka "MOOSE ROCKET"
91 TRX250X aka "MOOSE WAGON" RETIRED
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
96 Polaris 250 Trail Blazer (daughters)
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post #3 of 31 (permalink) Old 02-24-2010, 04:31 AM Thread Starter
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K Thanks bro. Do u kno if running it lean for a little while could cause my valves to go out of adjustment all of the sudden or could i have another problem internally? Cuz i just had them adjusted professionally and they were only good for a little while?

07 416ex
Wiseco 87mm piston(fly cut for clearance)
Stg 2 magnum cam
Kibble white +1 valves (high rev springs+titanium retainers)
Crf450 t-chain
Cometic gaskets
Gt thunder hd studs
EBC DRC Clutch
PRM skid
Hmf full pipe
UNI filter + ehs powerlid
45 pilot, 1 3/4 turns, middle clip, 190 main
razr XC tires
Team Alba (bumper,nerfs,beadlocks,+2 lt arms)
Mod quad dash
Acerbies handguards
Msr ez pull lever
Oury grips
Fasst Flexx bars
TCS triple rate front shocks
PEP rear shock
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post #4 of 31 (permalink) Old 02-24-2010, 05:41 AM
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running lean will actually burn a piston I'm not sure on the valves I would think it would have a little bearing on their performance.? I dont' think you messed anything up just re-adjust them and try it for a littlewhille

"MOOSE WAGON "
00 TRX400EX aka "MOOSE ROCKET"
91 TRX250X aka "MOOSE WAGON" RETIRED
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
96 Polaris 250 Trail Blazer (daughters)
06 TRX450ER aka === Under construction

Progress and Help
PM FOR MANUAL HELP
JETTING
Service_Manual_Downloads
2000_400EX_Build
400EX_Pivot_Bolt_
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post #5 of 31 (permalink) Old 02-24-2010, 11:46 AM
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Yeah, and make sure you tighten the lock nuts down good. When you had them adjusted, they may not have tightened them good.

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
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post #6 of 31 (permalink) Old 02-24-2010, 12:02 PM
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Quote:
Originally Posted by Helmut View Post
Yeah, and make sure you tighten the lock nuts down good. When you had them adjusted, they may not have tightened them good.
Seen that before...lol not a pretty outcome on a car anyway...lol

"MOOSE WAGON "
00 TRX400EX aka "MOOSE ROCKET"
91 TRX250X aka "MOOSE WAGON" RETIRED
96 Polaris 400L sport (Mrs. Moose Ride)
07 Suzuki LTZ250 (Sons)
96 Polaris 250 Trail Blazer (daughters)
06 TRX450ER aka === Under construction

Progress and Help
PM FOR MANUAL HELP
JETTING
Service_Manual_Downloads
2000_400EX_Build
400EX_Pivot_Bolt_
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post #7 of 31 (permalink) Old 02-24-2010, 12:09 PM
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400EX-300EX Valve Adjustment

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post #8 of 31 (permalink) Old 02-24-2010, 04:15 PM
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just make sure you got the T mark on the compression stroke..and not the ex stroke !!!..or you can kiss that top end goodbye..lol
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post #9 of 31 (permalink) Old 02-24-2010, 05:00 PM Thread Starter
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K i adjusted them 2 spec and they still tap alittle more than i like. I mean a noticable tap tap tap and it gets faster when i ride around.

07 416ex
Wiseco 87mm piston(fly cut for clearance)
Stg 2 magnum cam
Kibble white +1 valves (high rev springs+titanium retainers)
Crf450 t-chain
Cometic gaskets
Gt thunder hd studs
EBC DRC Clutch
PRM skid
Hmf full pipe
UNI filter + ehs powerlid
45 pilot, 1 3/4 turns, middle clip, 190 main
razr XC tires
Team Alba (bumper,nerfs,beadlocks,+2 lt arms)
Mod quad dash
Acerbies handguards
Msr ez pull lever
Oury grips
Fasst Flexx bars
TCS triple rate front shocks
PEP rear shock
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post #10 of 31 (permalink) Old 02-24-2010, 05:03 PM
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Could be a worn bearing then or a worn cam or rockers.

Billy

1991 Trx250X Custom exhaust,K&N jetted,widened 7.5 inches in the back and 8 inches in the frontWarrior rear shock and z400 front shocks with custom brackets.Race cut fenders.+3 swingarm.Way more to come.
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