How many turns out on fuel screws 99 srx?

YAMAHIZAL700

YAMAHIZAL700

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I've been struggling to get my sled going right. I got all three pipes nice and hot after fumbling around with cleaning carbs a bunch of times and replacing one needle and seat. On stand it ran real nice but after I put airbox back in and thought I was gonna go for a rip the f-ing thing bogs out and has no power! It's now smoking like the oil pump is stuck full boar. When fooling with carbs I removed and cleaned the fuel screws. I've never really messed with them before. I counted turns in. 1 was almost 4 turns out and and the other 2 were like 2-1/4. Really frustrated at this point. Only thing I did different was messed with the fuel screws. Help. I don't know what's going on. It is almost like I'm dealing with the same problem I started with. Any thoughts appreciated.
 

This can't be my main problem with the bog since where they were set this way previously and sled always ran strong but always a little on the smoky side. Any ideas?
 
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plus the oil injetion cabil isn't pulled apart at the joint after putting carbs backin.this will cause a bad riching.
 
I'm a little nervous about messing with my fuel screws but whats the worse that can happen if they are not spot on and how do u no when they r perfect? I set 2 of of my carbs at 1.5 out and the mag side to 1~7/8 out. The reason I went different on that one is because my compression is a bit higher on that cylinder. They are 125 on clutch and center and 140 on mag or muffler side. Is that logical?
 
YAMAHIZAL700 said:
I'm a little nervous about messing with my fuel screws but whats the worse that can happen if they are not spot on and how do u no when they r perfect? I set 2 of of my carbs at 1.5 out and the mag side to 1~7/8 out. The reason I went different on that one is because my compression is a bit higher on that cylinder. They are 125 on clutch and center and 140 on mag or muffler side. Is that logical?
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I would be checking with a second gauge.....140 is rather high for a stock sled. My opinion...no thats not logical.
 
Devilin AblueDress! said:
I would be checking with a second gauge.....140 is rather high for a stock sled. My opinion...no thats not logical.
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buddy has a stock 98 zr 600 that has 145 lbs on each cyl, wouldnt say thats totally abnormal
 
Srx's should be even across the board for a healthy engine. 145 does sound high though for an srx. 120-135 seems to be the norm. Depends on the elevation too!


Just checked mine today and I have 140 psi on all three, throttle open. Maybe we just have good ones. ;)!
 
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bADa$$ SRX said:
buddy has a stock 98 zr 600 that has 145 lbs on each cyl, wouldnt say thats totally abnormal
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Sorry, I will clarify.If at any point I do a compression test on any of my stock srx's and numbers come back 125/125/140 I will be checking with a second gauge before I tear into engine to figure out.....WHY? When I said stock sled I didnt mean a twin made by another manufacturer.
 
Well when I bought the sled I had to rebuild the motor and I think when I did I only had to replace center and clutch side cylinder heads. What would make that one cylinder have more compression? Will porting do it or is it the head maybe shaved. I have ridden the sled this way for countless miles but my question is was turning the fuel screw out a little more on that cylinder the right idea being that it has the higher compression number than the other two? Is 15 psi more really that much?
 
it sounds like it might have had shaved heads and when you replaced the other 2 you brought those back to stock. If you're interested check the squish on that cyl vs the other. I've got some stock 98-99 heads here. I could swap one with you if it turns out that head was shaved.
 
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