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/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Noob jet question /cgi-bin/YaBB.pl?num=1491689031 Message started by tinkleFury on 04/08/17 at 15:03:50 |
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Title: Noob jet question Post by tinkleFury on 04/08/17 at 15:03:50 You guys helped out a lot last summer with what turned out to be a leaky float value. I replaced it (finally) and and added 1/4 turn shut-off to use instead of the shady petcock. While monkeying with the carb, i thought I'd see what jets were in there. Took a picture and didn't think much of it. On reading some of the applicable threads, I'm wondering if this explains some of the plug fouling I've found I'm getting (in between completely filling the crank case with fuel). Could I seriously have a 230 as my main jet? Or does the identifier on it mean something else? Bike's got a cone air filter, straight pipe exhaust, and absolutely terrible milage (would that explain it?). Though it seems to operate quite nice! |
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Title: Re: Noob jet question Post by verslagen1 on 04/08/17 at 15:35:40 EU jet sizes are different than USA for the same size jet. And so are Dynajets. Are you in the EU? |
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Title: Re: Noob jet question Post by tinkleFury on 04/08/17 at 15:49:10 Ah, didn't know that! Thanks! I'm in Ontario Canada, though this bike's a 95 and I think has been around the block as far a previous owners. I'll read some more on it and, barring all else, get a proper hole gauge to check what it is. |
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Title: Re: Noob jet question Post by batman on 04/08/17 at 16:06:20 Vercy,I think he's in Canada.I don't know about you but I hope that jet isn't a really a 230,but he did say his mileage was bad,and he had plug fouling,with a 230( his plug should look like a coal mine)I'd think he might be better off starting with a 155-160 with his bike (cone filter/straight pipe). |
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Title: Re: Noob jet question Post by tinkleFury on 04/08/17 at 17:19:41 Yah, I suppose 'coal mine' puts not too fine a point on it. I've had trouble with poor starting on occasion of the last 2 summers owning the bike and chalked it up to an ignition problem (only seemed to be troublesome starting when below ~18C (65 american)). Had to trailer the bike home from work last fall cause I couldn't get it started, even with jumpers to my truck. Finally got around to checking for spark last week (has been in the garage all winter) and found a lively arc. Happy it wasn't that, but miffed at what else it might be, I pulled the plug (which might have had 50 miles on it) and thought. "Oohhhhhhh". For some reason I had got to thinking plug fouling was the kind of thing you'd get in a lawn mower sized engine. Not considering they're fundamentally the same. This lead to learning a rich mixture could do this, (as probably did my leaky float valve (http://suzukisavage.com/cgi-bin/YaBB.pl?num=1468379165/25#25)), and starting to learn about jets. |
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Title: Re: Noob jet question Post by LANCER on 04/09/17 at 02:05:46 Did you pull that #230 jet for the top of the carb or from the bottom ? |
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Title: Re: Noob jet question Post by tinkleFury on 04/09/17 at 03:36:13 From the bottom, if I understand your meaning. Consistent with this diagram from serowbot's thread, where it says 'main'. Maybe I'm not even talking about the right thing? |
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Title: Re: Noob jet question Post by batman on 04/09/17 at 15:12:08 You've got the right place,but the wrong size jet,the largest stock jet used in any 650 is a 155 used in 86-87 ,later bikes used 145 .That was why I said you might start with the 155, jet sizes go up from their to 157.5,160, 162.5 etc. The230 you have in there now is HUGE ! You're mileage should be at least 40+ if using the correct jet ,and the plug fouling is because your running so rich ,half the fuel isn't burning,It's turning into carbon on your plug and piston crown ,and washing the oil of your cylinder walls (could score them as well as causing high piston ring wear)moving past the rings on its way into your oil.I would obtain a jet in the 155-160 range and change your oil and filter as soon as you can so as to not ruin your motor!After that read in the technical section about how to fine tune your carb. Jets should only cost +/- $8.00. |
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Title: Re: Noob jet question Post by Kris01 on 04/09/17 at 20:11:54 That little "square in a square" logo on the jet is Mikuni's logo. That looks like a stock jet but I really doubt Mikuni put it there. Must've been a previous owner not knowing what they were doing. |
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Title: Re: Noob jet question Post by batman on 04/09/17 at 22:26:16 Kris is correct ,that size jet should be in a carb of say 45-48 mm, the carb on our bikes is 40 mm.Which means the 230 jet is for a carb 1/3 bigger than ours.(in a 48mm carb.that jet could feed a 1000cc Harley). |
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Title: Re: Noob jet question Post by justin_o_guy2 on 04/09/17 at 22:30:43 4142574E424D171B230 wrote:
Which means the 230 jet is for a carb 50% larger or 1/3 bigger than ours. should be in a carb of say 45-48 mm, the carb on our bikes is 40 I so Teautillee don't get your math. |
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Title: Re: Noob jet question Post by verslagen1 on 04/09/17 at 22:43:39 2D3234332E2918281820323E75470 wrote:
That's the math he uses with his girl friend. |
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Title: Re: Noob jet question Post by batman on 04/09/17 at 22:45:00 area of a circle-A=3.14xr squared, 40mm(20x20 x3.14=1256)48mm(24x24x3.14=1888) (1256/1888= approx. 1/3larger) that was my late night math above sorry ,tired. but the 230 jet does put out about 50% more fuel into the mix. |
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Title: Re: Noob jet question Post by LANCER on 04/10/17 at 05:06:49 http://https://s26.postimg.org/w5hsq9m3d/Carb_Parts_07.jpg I'm not sure you can see it in this photo but the larger jet on the left is a #230; this is from the top of the carb. Someone just put the jet from the top in place of the main jet on the bottom by mistake. |
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Title: Re: Noob jet question Post by batman on 04/10/17 at 06:35:50 SO what's in the top a 145? |
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Title: Re: Noob jet question Post by norm92de on 04/10/17 at 14:55:31 That is one of the joys of buying a used bike. A highly skilled PO. ;D |
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Title: Re: Noob jet question Post by Kris01 on 04/10/17 at 18:56:05 Lancer, are you saying the 230 is stock, just in the wrong place? |
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Title: Re: Noob jet question Post by batman on 04/11/17 at 20:44:23 Lancer , nice catch ! I guess none of us has ever bothered to look at what size the jets were under the diaphragm. |
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Title: Re: Noob jet question Post by Kenny G on 04/11/17 at 21:18:12 Would there be any reason to change the jets under the diaphragm? Does any one actually know what the above mentioned jets do? Kenny G :-/ |
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Title: Re: Noob jet question Post by Dave on 04/12/17 at 02:15:09 2B050E2312011308600 wrote:
There is no reason to change the jets under the diaphragm....you can do any adjustment you need with the jets in the float bowl. The jets up top are the air jets....they control the amount of air that mixes with the fuel that goes through the pilot jet, the choke and the TEV. |
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Title: Re: Noob jet question Post by tinkleFury on 04/13/17 at 17:51:50 Well, I had the local bike shop order me a 155 and picked it up. Pulled the carb and popped it in. I had hesitated before to pull the diaphragm. It felt like I'd tear it. But on popping by the top off this time the funny integrated o-ring thingy unseated itself and looked robust enough to peel out. The 2 jets in there were a 145 and a 45. Not sure what that means! Was just getting ready to try and fire her up when plans changed. Am now sitting in a hospital possibly about to see our 3rd child born! Hopefully it's false labor and they send us home. |
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Title: Re: Noob jet question Post by Kris01 on 04/13/17 at 18:41:08 Those are stock jets and CONGRATULATIONS!!!!!!!!!! ;) |
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Title: Re: Noob jet question Post by verslagen1 on 04/13/17 at 18:43:47 How rude, tell her to hold it, you're working on a mystery. ;D 155 is probably too big, 150, but I don't know what else you got. |
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Title: Re: Noob jet question Post by Kris01 on 04/13/17 at 18:43:51 http://suzukisavage.com/cgi-bin/YaBB.pl?board=tech;action=display;num=1098869040 http://suzukisavage.com/images/uploaded/CarbSpecs01web.jpg |
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Title: Re: Noob jet question Post by Dave on 04/14/17 at 03:43:59 79777C7979706161150 wrote:
What that most likely means....and Lancer was the one who "supposed it"....somebody goofed and switched the #230 which is supposed to be on the top.......with the #145 main jet which is supposed to be on the bottom. Put the #230 up to where it belongs......when you get done with your childbirth chores. |
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Title: Re: Noob jet question Post by batman on 04/14/17 at 07:24:01 Yes 230 in the top, and I'd go with the 155 for the main (may be a little to big, but the 145 will be way to small because of your cone filter and straight pipe).You may need to do the spacer mod. on the needle jet if you have surging at steady speeds. |
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Title: Re: Noob jet question Post by tinkleFury on 04/14/17 at 16:36:01 Ok! so no baby for a bit (we hope). I should have read the whole thread over again before popping n the 155. I pulled the carb out again and put that 230 jet in where it belongs (on top, where the 145 was hiding). Got things back together and took it for a spin. Am excited to think this will help with the plug fouling and milage issues. Mostly excited about being able to start it reliably (clean plug). While I was mystified why someone would put so weird a main jet in, I get how they could get mixed up if not careful or aware. Going to leave the 155 in for now and see how it does. Has to be better than the 230 right? Happy to be in the right ball park for that. Will muck about with the pilot setting next. Thanks, all of you, for your advice. Think we're ready for some summer! When I was done I caught her looking at me through an old mirror I need to put away... Think she winked too. |
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Title: Re: Noob jet question Post by IslandRoad on 04/14/17 at 20:21:54 Not sure if it's been mentioned, but there's a brass washer that goes in with the main jet ... it's important. |
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