Decompressor Question - Honda TRX Forums: Honda TRX 450R Forum

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Old 07-30-2010, 08:35 PM   #1 (permalink)
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Default Decompressor Question

Hey guys i had a question about the decompressor. I have been noticeing a noise from my 2005 450r and i havent had it too long so i figured the valves were out of adjustment. So i took it to get the valves adjusted and told them about the noise i have been hearing when they tore into it they told me that there was something wrong with the decompressor so they took it out. They told me that the only way to fix it is buy a new cam. Has anyone else had this happen and if so what did you do to fix it cuz this think will break your leg trying to kick it over now with no decompresor. Any help would be appreciated.
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Old 07-31-2010, 09:00 AM   #2 (permalink)
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the only control the camshaft has over the decompressor is the PIN location....or 'timing' for the decomp to operate...... although this can be designed wrong from the factory (long story)... chances of a cam that was working Ok going 'bad' over time is on the RIDICULOUS side of the scale..... ask the dealer to describe exactly WHAT is wrong with the cam and/or decomp mech...... it's worth a few laughs at least... lol

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Old 07-31-2010, 10:06 AM   #3 (permalink)
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Like ^^ he said..let us know what they say.....this should be good!
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Old 07-31-2010, 03:49 PM   #4 (permalink)
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He told me that the pin was siezed up and it wasnt working right so he took it out. I dont know how that would happen but it is a s.o.b. to kick start now so i need to get a new decompressor and fix it.
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Old 07-31-2010, 04:18 PM   #5 (permalink)
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Get the part back and look at it yourself. There really is no pin on it that can seize up. There is a spring and a weight system to it and a bolt that holds the assembly in, but not pin that would lock up keeping it from operating properly. If you get it back take a pic of it and post it.
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Old 07-31-2010, 04:20 PM   #6 (permalink)
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Only Possible problem I See Would Lie In The DECOMPRESSION ASSY Some Where Seprate From The Cam
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Old 07-31-2010, 10:37 PM   #7 (permalink)
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He said something in it was siezed up possibly in the decompressor assembly i dont know for sure just what he explained to me over the phone i will try to get it from him and take a picture of it but it is killing my foot trying to start this thing with out it. These motors have a ton of compression i weigh 200 and all my weight will barely turn it over fast enough to start it.
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Old 08-01-2010, 01:10 AM   #8 (permalink)
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Quote:
Originally Posted by cbgauthier View Post
He said something in it was siezed up possibly in the decompressor assembly i dont know for sure just what he explained to me over the phone i will try to get it from him and take a picture of it but it is killing my foot trying to start this thing with out it. These motors have a ton of compression i weigh 200 and all my weight will barely turn it over fast enough to start it.
Yep Its' possible it's Going To Kick Back Soon Kill Your Foot Kick Starter Lever Break Some Cases
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Old 08-01-2010, 07:24 PM   #9 (permalink)
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so can you still use the decompressor with a aftermarket cam like a hotcam? I would possibly buy a new cam if i can put the decompressor back in it.
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Old 08-01-2010, 11:50 PM   #10 (permalink)
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Quote:
Originally Posted by cbgauthier View Post
so can you still use the decompressor with a aftermarket cam like a hotcam? I would possibly buy a new cam if i can put the decompressor back in it.


YepEr
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Old 08-02-2010, 09:12 AM   #11 (permalink)
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that is not the issue.... you posted that the dealer said the ONLY way to solve this issue is with a new CAM.... then the dealer tells you the DECOMP MECH is seized up.... not likely, but possible... so HOW does a defective Decomp Mechanism require a new CAM? that is my question for the dealer.....

better yet.... get the decomp back from the dealer and lets FIX IT.... and dont waste your money on a new cam when this particular dealer sounds like their mech's are about as bright as a broken bulb with no power going to it....
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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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Old 08-02-2010, 11:07 AM   #12 (permalink)
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^^ Agreed with Greg. There isn't really a whole lot to seize up on the decomp. I'll try and remember to take a pic of my decomp tonight to post up.

Really the only moving part on it is the weighted arm which opens up at a certain RPM, and the spring which helps bring it back to its rested position at really low RPMs.

Buying a new cam should have nothing to do with the decomp, as it is removable so all parts can be replaced, and a decomp should be cheaper then a new cam I would think. So if anything you could buy a new decomp, or the part that is bad.
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Old 08-02-2010, 03:34 PM   #13 (permalink)
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Ok so i went and got the decomp back form him and nothing is broke on it or seized up. The problem lies in the weight that is in the cam that comes out to engage the decompressor. It is stuck about half way out so when it was running the weight was slaping the decompressor arm and partially engaging it all the time it was running which is where my ticking noise was coming from and was causing it to not idle cuz the decomp was constantly working. He says the only fix is a new cam cuz it will have the weight already in it. So does that sound right to everyone or not?
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Old 08-02-2010, 04:50 PM   #14 (permalink)
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Quote:
Originally Posted by cbgauthier View Post
He says the only fix is a new cam cuz it will have the weight already in it. So does that sound right to everyone or not?
If You But A Complete Decomp Assy Not A Valve Cam That Does Not Come With A DeComp Assy They Are Separate parts

My Question What Is Keeping The Thing From Working See Whats Binding

Unless They Have Done Away With It All Parts Are Available Separately If On 04-05 Assy Well The DeComp Weight Goes Trough The Decomp Assy And Does Not Realy Have Anything To Do With The Valve Cam. The Decomp Assy Is Separate Of Cam And It's Own Mechanism That Is Timed With And Driven By The Cam But Are Separate After That They Changed To A Rod That Goes Through The Cam That Moves A Pin And Those pins Break And Could Get Debris Scaring The inside of Cam Not Allowing The Actuator Rod To Work. Now Could You Have A Newer Style One Take A Picture Lets See What it looks like Or Show us One
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Old 08-02-2010, 05:29 PM   #15 (permalink)
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Another Thought What Ever Is Causing The Binding Could It Be Fixed By What Ever means Ploshing Removing A Burr Etc But if Something is Bent Replace it
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