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Old 07-30-2012, 08:05 AM   #5161
mcma111
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Kirbi,

If you want a performance cam get one from Cycle Wizard. About $180.00 but you will also want to get your rocker arms treated at $55.00 each. Your engine will thank you.
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Old 07-30-2012, 09:22 AM   #5162
kirbi69
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ok i wont buy it. ill just remove the decompressor stuff. i just take everything off the cam right? and weld up that little hole on the cam?
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Old 07-30-2012, 09:26 AM   #5163
mcma111
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Why in the world do you want to remove the decom stuff? It's there for a reason.
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91 R100gs

87 Harley FXRS-SP ~ 06 KTM 625 SMC ~ 72 Honda CB750/915cc ~ 92 XR600/654cc ~ 95 XR650l/675cc ~ 03 CRF450r ~ 05 CRF450x ~ 02 XR650l/675cc ~ 86 YZ490 ~ 93 YZ80 ~ 93 XR650l Project
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Old 07-30-2012, 09:56 AM   #5164
kirbi69
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it makes too much noise. and it beat my right exhaust valve all to hell. i heard others say i dont need it. justneed the manual decomp lever
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Old 07-30-2012, 10:09 AM   #5165
elsalvadorklr
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Quote:
Originally Posted by kirbi69 View Post
ok i wont buy it. ill just remove the decompressor stuff. i just take everything off the cam right? and weld up that little hole on the cam?
yup you can do this

I tool it off because I didnt know what mileage my engine had when I bought it

reasons for taking it off are:

redundant
they fail when high mikeage

they actually cause the bike to stall a lot when high mileage, so you really have to keep a high idle

reasone to keep it are:

if you are lazy and want to just kick instead of learning the drill
they are supposed to prevent kickbacks, dont know how it does that really

yes MUST weld up hole or plug it up or you will suffer from oil depravation in the cam area...

what fails is the actual sprag gear or clutch and they start to rattle, the springs inside lose tension too..

lastly

some people take them off because they beleive that less rotational mass will make the cam spin more freely

thats far fetched BUT it is true you will save a couple ounces of rotational mass

if you want details I can send pics if you want

lastly

I do however agree with steve THERE IS NO REASON TO TAKE IT OFF

however they do eventually fail especially on high mileage bikes and you will start getting mad at the bike when it stalls, makes a racket, etc...

there is plenty of info on the nets about this if you want to search for yourself

anywhoo

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Old 07-30-2012, 10:13 AM   #5166
elsalvadorklr
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Quote:
Originally Posted by kirbi69 View Post
it makes too much noise. and it beat my right exhaust valve all to hell. i heard others say i dont need it. justneed the manual decomp lever
exactly YOU have a reason to take it off...you are one of the few but you have evidence

press off sprocket on cam...

weld hole under mechanism for decomp

make sure the weld does not use the cam as a ground in other words tell the welder that you must not get any "arching" on any part of the cam...

you do not want any imperfections anywhere near the lobes!

I had a small imperfection on one of the lobes but it does not make any noises or anything...

then press sprocket back on and your done

the manual decomp works flawlessy

this is a case of honda redundancy in an effort to prevent rider discomfort! jajajajaja
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Old 07-30-2012, 10:44 AM   #5167
kirbi69
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yeah i always use the starting drill. hot or cold. fires up first kick everytime. i really dont think i need the autodecom. christian, didnt you say you took yours off first thing when you got the bike?
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Old 07-30-2012, 11:01 AM   #5168
Alaskajeff
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Quote:
Originally Posted by kirbi69 View Post
yeah i always use the starting drill. hot or cold. fires up first kick everytime. i really dont think i need the autodecom. christian, didnt you say you took yours off first thing when you got the bike?
I've owned my 88 XR600 since last spring. The decomp cable was broken when I got it. Never really needed it, just learned how to start it by finding TDC and never looked back. Removed the lever, and all other associated stuff. Just have the mechicnizm on the top end still attached.
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Old 07-30-2012, 11:02 AM   #5169
elsalvadorklr
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Quote:
Originally Posted by kirbi69 View Post
yeah i always use the starting drill. hot or cold. fires up first kick everytime. i really dont think i need the autodecom. christian, didnt you say you took yours off first thing when you got the bike?
yup i sure did!

since I didnt know the mileage on the bike I took it off just in case

I read a lot about it and found out its a possible failure source so I just took it off

headtrauma among others use no autodecomp too
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Old 07-30-2012, 12:25 PM   #5170
elsalvadorklr
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alright paging techforlife?

can someone tell me the magnet trick used to test the pg is triggering or not?

I have the clutch cover off

everything looks good

the airgap for the pg is about.5mm

sooooo

a weird thing is the gap seems smaller than before

that could mean what? my damn crank is wobbling?

also there is a concave shape to the pulse generator tab or sensore, like if the tab on the crank gear is wearing a pattern on the pg?

anywhoo

I cant rememebr if I noticed this last time

but if anyone know the trick to test the pulse generator can trigger please let me know

I remember brian explained this to us a while back but I CANT seem to find it.

thanks

christian
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Old 07-30-2012, 01:10 PM   #5171
elsalvadorklr
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alright update:

bad news I guess

my gap on the pg to crank tab is .20mm

it should be .7mm

this explains the wearing of the tab on the pg

the pg is magnetised and I can get my meter to register movement..

but if the gap is too close what will this do?

too much voltage?

could I file the tab on the pg or could I try bending the bracket to get more gap?

this might of been caused by my old crank that was wobbly

????????????????????

thoughts?

thanks
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Old 07-30-2012, 01:22 PM   #5172
BSW
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( weld hole under mechanism for decomp ) I removed the autodecomp on both my 96xr to help easier starting and like wise it does not stall any more,i took the info off an old Australian bike mag about xr 600s used in the Aussie Safari Rally .No where did it mention to weld the hole in the cam,will this be a problem for me in future?
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Old 07-30-2012, 01:31 PM   #5173
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yes. much more rapid wear of the cam and rockers.
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Old 07-30-2012, 02:48 PM   #5174
mcma111
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The reason a XR engine may stall with the auto decom is because the idle is set to low. The whole decom thing is really a anti kick back and to assist with low RPM engine starting.
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BMW's
58 R26
79 R100s
91 R100gs

87 Harley FXRS-SP ~ 06 KTM 625 SMC ~ 72 Honda CB750/915cc ~ 92 XR600/654cc ~ 95 XR650l/675cc ~ 03 CRF450r ~ 05 CRF450x ~ 02 XR650l/675cc ~ 86 YZ490 ~ 93 YZ80 ~ 93 XR650l Project
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Old 07-30-2012, 03:20 PM   #5175
elsalvadorklr
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steve any thoughts on my tight air gap on the pg?

it was way tight

should of been .7mm

anywhoo

think a pg is on order...

maybe next week
jajaja
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