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Mechanic put 117.5 jets on my bike. K&N time?

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  • #1

    Mechanic put 117.5 jets on my bike. K&N time?

    Hey Katriders,

    Like the title says, I'm pretty sure my mechanic (likely former mechanic now) put 117.5 main jets on my 2001 Kat 750 two weeks ago. I got the bike last month, got a 2 bros slip on for it. It was running like crap (wouldn't idle, surging, etc) when I bought it and I read on yelp this mechanic is "an artist" with carbs so I took my slip on and bike over to him. When I dropped it off I metnioned that these forums recommended a 114 main jet with a slip on but when I picked it up he said "uuuh I put a 120... no wait... a 117.5 on there. It was one size bigger than what it had already..."

    /sigh

    So she seems to be running really rich now. Its not terrible, and she really pulls when wide open but has poor throttle response at low RPM and idles rough when cold. I'm also worried about damaging the engine with unburned fuel washing away the oil now.

    Last night my buddy and I wer talking about it and he had an idea, lets see what happens with lots of air ... We pulled the air box out completely and started her up to see how she ran. Surpisingly to me (not to him as it was his idea), low RPM throttle response was way way way better. Up high she seemed starved for fuel (based on my limited experience with VM Beetle and my Honda Nighthawk) but I assume that would be assuaged with some sort of air filer on there providing some resistence.

    Long story short, do you guys think it's worth trying a K&N air filte ron my bike? It seems a lot easier than re-jetting again.

    Thanks in advance!

    -SDGuero
    Tags: None
  • #2
    It's supposed to have 117.5 jets.
    [ame="http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=190740761885&ssPageNam e=STRK:MESE:IT"]carburetors carbs Suzuki GSX750F Katana 750 98-06[/ame]
    Putting a K&N air filter on your bike isn't going to "fix" a damn thing. It'll make whatever running issues you have far worse.
    Who the hell said you should get 114 mains jets? That's a Dynojet main jet number. The 117.5 is a Mikuni main jet number. Unless you have a Dynojet jet kit, you shouldn't use a Dynojet main jet. If you do have a Dynojet jet kit, you shouldn't use a Mikuni main jet. Until you clarify what you have, you have a giant bag of fail.
    Last edited by arsenic; 06-04-2013, 06:05 PM.

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    • #3
      Originally posted by arsenic View Post
      It's supposed to have 117.5 jets.
      carburetors carbs Suzuki GSX750F Katana 750 98-06
      Putting a K&N air filter on your bike isn't going to "fix" a damn thing. It'll make whatever running issues you have far worse.
      Who the hell said you should get 114 mains jets? That's a Dynojet main jet number. The 117.5 is a Mikuni main jet number. Unless you have a Dynojet jet kit, you shouldn't use a Dynojet main jet. If you do have a Dynojet jet kit, you shouldn't use a Mikuni main jet. Until you clarify what you have, you have a giant bag of fail.
      Chris knows his shit. Listen to him.
      sigpicLife throws you curves......enjoy the ones you get when riding.
      ------------------------------------------
      89 GSX750F(sold....sob)
      96 YZF 1000R

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      • #4
        Can we just have a banner on the front page saying not to put K&N filters on these bikes? Seems like every other post is about them.
        2005 Gsx600f- My baby
        1989 Gsx600f - My hell raiser
        Some times I take off one side of the fairings and ride around pretending I'm two face

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        • #5
          It won't help any. I'm not "an artist" with carbs. I'm THE artist with carbs. So your former "mechanic" can fuck right off. BTW, after "an artist" with carbs worked on your carbs, did they look like that set I posted? Cause every set I build look just like that.
          Last edited by arsenic; 06-04-2013, 10:28 PM.

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          • #6
            Originally posted by arsenic View Post
            It's supposed to have 117.5 jets.
            carburetors carbs Suzuki GSX750F Katana 750 98-06
            Putting a K&N air filter on your bike isn't going to "fix" a damn thing. It'll make whatever running issues you have far worse.
            Who the hell said you should get 114 mains jets? That's a Dynojet main jet number. The 117.5 is a Mikuni main jet number. Unless you have a Dynojet jet kit, you shouldn't use a Dynojet main jet. If you do have a Dynojet jet kit, you shouldn't use a Mikuni main jet. Until you clarify what you have, you have a giant bag of fail.
            Thanks for the clarification. I ahd been looking at the dynojet website and assumed the jet kits used the same sizing... My bad.

            117.5 makes a lot more sense now assuming he installed a Mikuni jet kit. I just wish I had worked on it myself so I knew exactly what was in there.

            I have been busy with work, selling my other bike, and working on my truck he last 2 months so the Kat has just been carrying on with some light commuting duty.

            I never ordered the K&N filter and clearly that isn't the way to go. I still feel like my bike is running rich at idle but under power she runs like a dream and gets decent MPGs so I'm not too worried about it.

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            • #7
              Take the bike back to your "artist" and describe the symptoms to them. If you paid them to "make it run right" then they're not finished with the job and should be given the chance to make it right.

              The main jets don't affect idle. That's the idle circuit. Your trouble is either dirty idle passages, dirty (or wrong sized) idle jets. maladjusted Air/Fuel mixture screws (A/F screws should be set at 2.5 turns out, not the stock 1.75 turns.) or the carbs just weren't synced properly.
              Wherever you go... There you are!

              17 Inch Wheel Conversion
              HID Projector Retrofit

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