how to set timming - Honda TRX Forums: Honda TRX 450R Forum
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post #1 of 17 (permalink) Old 08-07-2009, 11:09 PM Thread Starter
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i have a 2005 trx450.i just replaced the head.the timming mark on the right side is corect and the cam marks are correct.what should the flywheel be at t or f?
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post #2 of 17 (permalink) Old 08-07-2009, 11:14 PM
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Not sure what mark u use on the flywheel side.U can pop the spark plug out and use somthing to put on top of the
piston to see when its all the way up.Then set ur marks i use a bottle rocket and stick the wood end down the hole.

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post #3 of 17 (permalink) Old 08-07-2009, 11:14 PM
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i have a 2005 trx450.i just replaced the head.the timming mark on the right side is corect and the cam marks are correct.what should the flywheel be at t or f?[/b]
set it at "T"

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post #4 of 17 (permalink) Old 08-07-2009, 11:15 PM
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dont worry about the flywheel. just set it from the right side.

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post #5 of 17 (permalink) Old 08-07-2009, 11:26 PM
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Not sure what mark u use on the flywheel side.U can pop the spark plug out and use somthing to put on top of the
piston to see when its all the way up.Then set ur marks i use a bottle rocket and stick the wood end down the hole.[/b]
altho that will work to a certain extent, The TDC (T) mark is very close to the FIRE (F) mark... so its a possibility to have it a tooth off... how ever I would try to stay away from shoving anything down in your spark plug hole, I pull the flywheel peep hole cover off, the crank bolt cover off, and adjust the timing accordingly with the cam

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post #6 of 17 (permalink) Old 08-07-2009, 11:32 PM Thread Starter
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Not sure what mark u use on the flywheel side.U can pop the spark plug out and use somthing to put on top of the
piston to see when its all the way up.Then set ur marks i use a bottle rocket and stick the wood end down the hole.[/b]
altho that will work to a certain extent, The TDC (T) mark is very close to the FIRE (F) mark... so its a possibility to have it a tooth off... how ever I would try to stay away from shoving anything down in your spark plug hole, I pull the flywheel peep hole cover off, the crank bolt cover off, and adjust the timing accordingly with the cam
[/b]
your saying to use both the t mark and the mark on the right side.it seems if you were to use just the mark on the right side you can have the timming 180 out?
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post #7 of 17 (permalink) Old 08-07-2009, 11:44 PM
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Not sure what mark u use on the flywheel side.U can pop the spark plug out and use somthing to put on top of the
piston to see when its all the way up.Then set ur marks i use a bottle rocket and stick the wood end down the hole.[/b]
altho that will work to a certain extent, The TDC (T) mark is very close to the FIRE (F) mark... so its a possibility to have it a tooth off... how ever I would try to stay away from shoving anything down in your spark plug hole, I pull the flywheel peep hole cover off, the crank bolt cover off, and adjust the timing accordingly with the cam
[/b]
your saying to use both the t mark and the mark on the right side.it seems if you were to use just the mark on the right side you can have the timming 180 out?
[/b]
cam lobes back... if the cam lobes are facing the front of the bike..... then you are 180 out

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post #8 of 17 (permalink) Old 08-08-2009, 12:43 AM
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No such thing as 180 out on a one cylinder four stroke wasted spark engine !!

I never use the right side to time a 450r ! I always use the flywheel "T" mark ! Easy as pie and never an issue.
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post #9 of 17 (permalink) Old 08-08-2009, 12:47 AM
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Quote:
No such thing as 180 out on a one cylinder four stroke wasted spark engine !!

I never use the right side to time a 450r ! I always use the flywheel "T" mark ! Easy as pie and never an issue.[/b]
you CAN have your cam 180 out.... which is what im talking about..... notice i said cam lobes

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post #10 of 17 (permalink) Old 08-08-2009, 07:48 PM
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Quote:
Quote:
No such thing as 180 out on a one cylinder four stroke wasted spark engine !!

I never use the right side to time a 450r ! I always use the flywheel "T" mark ! Easy as pie and never an issue.[/b]
you CAN have your cam 180 out.... which is what im talking about..... notice i said cam lobes
[/b]
X2, you can most deffinitly have your cam 180 out.... i found this out the hard way. Couldn't find a reason why my quad wouldn't start, took 2 hours to finally figure out the cam was off 180, after i felt like a dumbass, but now she runs n cant complain

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post #11 of 17 (permalink) Old 08-08-2009, 09:31 PM
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NEGATIVE...

you cannot have this machine 180* off on the valve timing...

reason? the spark fires at both the POWER STROKE.....and the EXHAUST STROKE...

hence the term "wasted spark engine"....

the spark fires each and every time the piston reaches TDC..... therefore it can NOT be 180* off....or 360* off depending on how you look at it....


HOWEVER....on a side note... it is nearly impossible to align the timing marks and complete this process when the lobes are facing forward/down on the bumpstick.... reason being.... you are now pressing on the valve springs... which makes it EXTREMELY difficult to rotate the engine to get at a TRUE TDC....

like Mccune said....the easiest / best method is to use the flywheel 'T' mark.... (the 'F' mark is the timing advance mark)..... however, the flywheel 'can' become misaligned due to a half moon key issue...... so I tend to use the crank gear TDC mark....

to each their own.....

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post #12 of 17 (permalink) Old 08-08-2009, 09:39 PM
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Quote:
Quote:
No such thing as 180 out on a one cylinder four stroke wasted spark engine !!

I never use the right side to time a 450r ! I always use the flywheel "T" mark ! Easy as pie and never an issue.[/b]
you CAN have your cam 180 out.... which is what im talking about..... notice i said cam lobes
[/b]
X2, you can most deffinitly have your cam 180 out.... i found this out the hard way. Couldn't find a reason why my quad wouldn't start, took 2 hours to finally figure out the cam was off 180, after i felt like a dumbass, but now she runs n cant complain
[/b]

LMAO X100 !!
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post #13 of 17 (permalink) Old 08-09-2009, 12:13 PM
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Quote:
NEGATIVE...

you cannot have this machine 180* off on the valve timing...

reason? the spark fires at both the POWER STROKE.....and the EXHAUST STROKE...

hence the term "wasted spark engine"....

the spark fires each and every time the piston reaches TDC..... therefore it can NOT be 180* off....or 360* off depending on how you look at it....


HOWEVER....on a side note... it is nearly impossible to align the timing marks and complete this process when the lobes are facing forward/down on the bumpstick.... reason being.... you are now pressing on the valve springs... which makes it EXTREMELY difficult to rotate the engine to get at a TRUE TDC....

like Mccune said....the easiest / best method is to use the flywheel 'T' mark.... (the 'F' mark is the timing advance mark)..... however, the flywheel 'can' become misaligned due to a half moon key issue...... so I tend to use the crank gear TDC mark....

to each their own.....[/b]

wow, now i even feel more like a dumbass

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post #14 of 17 (permalink) Old 08-09-2009, 09:02 PM
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nah....

you were probably just a tooth off if your lobes were facing fwd/down... cuzz of the extreme pressure the valve springs puts on the engine...it is VERY difficult to time correctly this way....

once you put the piston at TDC...and the cam lobes are facing back/up.....you are no longer under any spring pressure and much much easier to time correctly...


jmho...Greg

**06 450ER**... #3 (Dale lives on)

86TRX250R (mostly stock 66mm bore x 72mm stroke) **for sale**
86TRX250R (ESR310 72.5mm bore x 72mm stroke '298cc' fully modded) **SOLD**
88TRX250R (ESR330 77.5mm bore x 74mm stroker '345cc' fully modded)

HRC kit (all but gone)
Hot Cams stage III
Okie porting w/ATP CV4 springs (36mm Ti/31mm)
Venom/KBR N2O Porting w/KW springs (37mm/31mm)
Venom/KBR 487 100mm 14.25:1 piston
Cold Fusion Nitrous**
Venom 'QP' pipe
ESR Pro Series pipe
ESR modded intake w/RAT stack
42mm Taper-Bored FCR
Direct Drive clutch lockout, CR500 springs
GT Thunder-Link w/Durablue Lowering Link
Durablue Anti-Sway Bar
Modded shock mounts
Rage Modded Tranny

Jetting/Carb: #168, #45slow, NGPR needle 3rd clip, #55 Leakjet, Pilot 2 turns out.
Jetting/N2O: 22N/21F (22hp)

*STU Comp Cut 21x12x8 (6) paddle 'Padla Brats' on Douglas Blue label 8x8.....

Thanx to: Venom/KBR (Mixxer/Kam), Rage ATV (Dee), Sredum (Chris), and many ORG members
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post #15 of 17 (permalink) Old 01-22-2012, 09:13 PM
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what exactly do you "adjust" if everything doesnt line up? All ive seen people talk about is lining up notches but not what to do if they dont line up lol. And what about using a timing light..
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