removing auto decompression

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removing auto decompression

Postby azr » Sat Jan 09, 2016 5:56 pm

Hey all. My 86' DR600 is a bugger to start cold (yes I've done the valves, rebuilt the carb, new boots and o-rings and anything else that is considered good maintenance) but she fires on the 2nd kick when I disconnect the auto decompression. I think the issue is that it's very hard to tell when I'm at TDC with the auto decompression, it never builds any resistance on the kicker so I can't tell when I'm at TDC. But of course with the auto decomp disconnected I can sure tell! :D Is it ok to just disconnect the auto cable and that's that? or am I going to do damage running the bike like that?
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Re: removing auto decompression

Postby BigBob » Sat Jan 09, 2016 10:01 pm

At 6ft 6 and over 17 stone I found it almost impossible to kick over my 600 without the decompressor. You must be Geoff Capes :crazy:
iirc there were two decomp cables on my 600 and one worked off the kickstart and was well known to cause trouble, often resulting in bent valves.
The received wisdom was that this cable should be removed and just leave the one on the handlebar which gave no trouble.
Why Suzuki designed it with two decomp cables is beyond me as it certainly didn`t need both.
Of course, it is possible your cable is not adjusted correctly as there should be considerable resistance at TDC, and if you don`t have that then there is certainly a problem with either your cable or your decomp shaft being incorrectly aligned.
As the effort needed to kick over the 600 was extreme, the advice I was given was "to kick it like you were kicking a rapist off your mother" so no resistance means something is very wrong.
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Re: removing auto decompression

Postby azr » Sun Jan 10, 2016 4:49 am

I am only wanting to remove the auto decompression, not the manual one. Good to know that even with the auto decompression connected I should still be feeling quite a bit of compression when trying to to find TDC, I currently don't find any resistance. The auto decompression is adjusted correctly, I've followed the shop manual instructions to the letter and when the bike is running I can move the auto lever the correct 2 mm and it start to hit. I've never had the cam cover off since I've owned the bike, I wonder if something is indeed wrong with the auto decompression lever internally. But just so I know, if I disconnect the cable from the auto decompression it isn't going to bother anything engine wise? I wasn't sure if I had to remove the actual shaft internally as well or not.
azr
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Re: removing auto decompression

Postby azr » Fri Jan 15, 2016 7:50 am

Problem solved. Turns out that the auto decompression kicks in within the first 1/4 of the kickstarter range only, as long as I only use the lower 1/2 - 2/3 of the range I can easily feel the resistance of TDC.
azr
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