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Help Across running lean.

Discussion in 'Suzuki 250cc In-line 4's' started by scottay, Jan 20, 2015.

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  1. scottay

    scottay Active Member

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    So after many many months of messing around with trying to find out why my bike will not rev above 12k rpm i took it to get dynoed and found out its running lean due to the slip on exhaust (straight through). He has made the bike run as rich as it could which helped it get to 13-14k rpm but its not very smooth. So it looks like my only real option is to rejet the bike. I dont really want to spend much money on it because im off my p's in 8 months but it would be nice to ride the bike properly until then.

    How much do new jets cost?
    How hard are they to fit?
    Is there anyone in melbourne who wants to help me do this for cash / beer lol.

    THanks :D
     
    scottay, Jan 20, 2015
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  2. Joker

    Joker See "about me" for contact details. Contributing Member

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    Why not just source an original exhaust?
     
    Joker, Jan 20, 2015
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  3. scottay

    scottay Active Member

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    The exhaust was cut half way down for the slip on. Id have to fit a whole new exhaust from the headers back and ive heard thats a fairly big job
     
    scottay, Jan 20, 2015
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  4. Joker

    Joker See "about me" for contact details. Contributing Member

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    Nah not really mate. 8 bolts at the head and one or two more holding your exhaust to the bike, it's normally a 5 minute job to pull off a whole exhaust - taking the fairings off takes the time.

    Capture.JPG

    There's not really much to it. I think rejetting your bike is going to be a whole lot of mucking around when for a little outlay you could probably source a second hand exhaust.... if you want help fitting/changing it I'm in NW melbourne and I'd be happy to help you out.

    Give the dudes at ringwood a call I'm sure they'd have one, or findapart.com.au

    Should be able to source a system for $100-$150 I'd think. No harm in trying anyway, rejetting/retuning is a lot for the sake of an incorrectly installed slip on.
     
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    Joker, Jan 20, 2015
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  5. scottay

    scottay Active Member

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    Hmmmm. I still have the old muffler. Maybe i could go checkout a exhaust joint and see if they can use the slipon to some how weld it back up with the stock exhaust on there. If not help would be awesome mate thanks heaps :D
     
    scottay, Jan 20, 2015
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  6. kiffsta

    kiffsta Senior Member

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    I have an across exhaust here you can have for $40, problem is I am in Brisbane
     
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    kiffsta, Jan 20, 2015
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  7. Joker

    Joker See "about me" for contact details. Contributing Member

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    I'd keep it simple, get a quote from Kiffsta for freight and buy his one. Shouldn't be much :)

    If not, PM me and drop in sometime we can have a look. A metal fabricator may be able to do a weld around and put the stock one back on.
     
    Joker, Jan 20, 2015
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  8. scottay

    scottay Active Member

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    thanks guys :D kiff ill pm you
     
    scottay, Jan 20, 2015
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  9. scottay

    scottay Active Member

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    So i had a look, trying to courier down the exhaust is going to cost an arm and a leg lol.
    Stu which guys in ringwood were you referring to?
     
    scottay, Jan 21, 2015
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  10. U_B_WARE

    U_B_WARE Well-Known Member

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    try http://www.greyhoundfreight.com.au/ they have some really good prices from depot to depot.

    also, if freight is really expensive, check out ebay and gumtree for bikes being wrecked close to you
     
    U_B_WARE, Jan 21, 2015
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  11. Joker

    Joker See "about me" for contact details. Contributing Member

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    Eastern motorcycle wreckers.

    8 Olive Grove, Ringwood VIC 3134, Australia
    +61 3 9870 9209


    Or throw it on findapart.com.au and let the wreckers contact you with pricing. Usually works a treat for me.
     
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    Joker, Jan 21, 2015
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  12. scottay

    scottay Active Member

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    Thx Stu :)

    Ive found that freight is going to be too much just due to the size and weight of it all.
     
    scottay, Jan 21, 2015
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  13. scottay

    scottay Active Member

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    So ive spoken to a few people who own across's and they are running aftermarket exhausts and are not having the same issue i am which leads me to believe it may be something else. I currently have the bike on the richest needle setting which makes the bike run like a pig down low but gives it a little more top end but it still wont rev out to redline. Since the carbies have been rebuilt with new seals and all that crap it could be the fuelpump dieing and not flowing enough fuel ?

    how can i check?

    Thanks
     
    scottay, Mar 9, 2015
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  14. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Have you set the idle mixtures?
     
    Linkin, Mar 9, 2015
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  15. scottay

    scottay Active Member

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    Yeah mechanic did all of that and balanced.
    Even ran it up on the dyno but couldnt get it rich enough to rev out through the top end. He fit me in short notice and got it running best he could but didnt have time to look into what the actual problem is. He suspected the exhaust was causing it to run too lean but a guy sent me a video of his across running with no exhaust and revving all the way to redline with no issues, which leads me to believe its not that.
     
    scottay, Mar 9, 2015
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  16. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Do you know which spark plugs are in it? They might be too hot.
     
    Linkin, Mar 9, 2015
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  17. scottay

    scottay Active Member

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    I honestly dont remember i changed them about a year ago and just replaced them with the same ones that were in there, they probably need doing again because its running so rich in the bottom end atm, what would you recommend.

    ALso the bike will rev out a bit more going down hill, and seems to run better on warmer days.
     
    scottay, Mar 9, 2015
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  18. Linkin

    Linkin The Mechanic Premium Member Contributing Member Dirty Wheel Club

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    Whatever the service manual says / ie stock. Not sure for the accross but it should be in the resources section
     
    Linkin, Mar 9, 2015
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  19. scottay

    scottay Active Member

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    Yeah i remember i checked and made sure they matched the factory plugs.
     
    scottay, Mar 9, 2015
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  20. scottay

    scottay Active Member

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    Is there a way i can test the fuelpump ?
     
    scottay, Mar 9, 2015
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