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Post by revelations on Apr 20, 2012 21:29:29 GMT -6
I just cleaned my carbs and I am having what I think is a strange problem. First off the bike was not running before the carb clean and its in pretty shotty condition, but it does run. I also installed Emgo pods on it and ditched the stock airbox, I have yet to rejet it. It currently does not have mufflers installed but does have the stack on it. All this said I start the bike and it almost instantly revs up and idles at about 3000-4000 I have practically no throttle response and it seams like its dumping fuel into the cylinders. I was thinking it might be airflow restriction so I restricted it and nothing same rpms not throttle response (I taped around the pods allowing only minimal space for air to enter into the carbs dont know if this is a proper way to restrict airflow or not... I checked my vacuum lines and there attached and in good condition.
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Post by Jet⚡Black on Apr 21, 2012 11:44:21 GMT -6
Are you allowing your bike to warm up first before getting on the throttle?
High revving bikes need some warm up time. Let the temperature gauge come up first. Get into this practice; to make your bike last a good long time.
Are you sure both vacuum lines are taken care of?
As in: Either capped one carburetor vacuum line and the other carburetor line to petcock, or T-ed both carburetor vacuums and the to the petcock.
Do your throttle cables move smoothly, with a little snap on release?
If not they need to be lubed and adjusted.
If the above questions are a yes and fine; then not having increased jet size with an open exhaust might be the problem because, your exhaust does need some back pressure.
Check these things in order; I put them from easiest to most trouble... Let it warm up, check vacuums, throttle play, exhaust back pressure, jets.
If none of this works for some reason come back and we'll get it figured out.
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Post by revelations on Apr 21, 2012 14:08:19 GMT -6
Sounds like a good list to go through. But the biggest problem is that it idles at 3000rpm with the idle control full out. Im going to hook on the mufflers today and see what happens its way too loud without them anyways I don't want my neighbors to get mad at me.... The bike is in pretty bad shape and I don't have any of the temperature sensors even hooked up yet, I don't even know if they are operational... A for the cables they are complete junk and I have yet to order new ones, but I made sure the throttle was held closed, maybe I should remove them from the carburetors and see if its just the cables holding me back they did seam pretty tight.
Do you all know of any good aftermarket cables out there I need a full set of them or that is have any recommendations
I also need a new jet kit as I am going aftermarket pods and mufflers who makes good kits. I am very new to this game of motorcycles. As an aircraft mechanic I know a lot but man these bikes are finicky compared to airplanes and everything is so small....lol
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Post by Jet⚡Black on Apr 21, 2012 15:39:55 GMT -6
The good news is it runs... ;D After its warmed up, you could try working the throttle by hand on the carburetor, they are linked so try to work the throttle at the carburetor so they both work together. I would just start gathering and working on the build; since it is running. JC whitney, or eBay should have some; if you are going to replace the Handle bars; bear in mind the cable length will change a bit, re-routing can usually deal with ones too long...too short and well you're kinda SOL in most cases. I wouldn't go with jet kits listed as stage 1 ect. they are way over priced, for what they are. Here's a couple cheap suppliers: www.sport-mann.com/eshopprod_cat_7956-37984_product_1303194.KEIHIN_JETS.htmwww.bobscycle.com/browse.cfm/2,16836.html I personally; would see how it operates after it is back together, before getting new jets. Some people have required no jet changes. But as a rule of thumb I use for CV carburetor jet changes; is getting main jets two or three sizes up, and up one pilot jet size...if you have to shim needles; your pilot jet is the wrong size...in a CV carburetor. Although, many people shim them without changing the pilot so that's left to personal choice and what works for you. Needle clips and shims are great for regular carburetors to edge out running rich or lean, but in CV's I have found going up or down one size in the pilot cures that...it also clears up having to restrict the filters and keeps them free flowing as intended. K&N filters I believe have a good write up about jet changing and CV's if I recall. Tiny Asian hands I guess have no issues  Don't let it intimidate you at all; a combustion motor is pretty much all the same: They Need: Oil, Air, spark, and Fuel that's it no matter what motor. If it isn't running it's either friction, or starving for fuel or air or bloated from fuel and air...simple stuff. |
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Post by eaglerider on Apr 21, 2012 15:40:29 GMT -6
sounds like u may not have your cables adjusted properly, and they are holding your throttle open, or they are binding up. Motion Pro makes good cables.
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Post by revelations on Apr 21, 2012 17:26:33 GMT -6
I went out earlier and removed all the cables from the carb and sure enough my throttle pull cable was bound up and holding it open a bit. Now it idles around 1100 but its throwing smoke not bad but some, I don't have the radiator on currently because of nuts and bolts do I don't want to run it more than a min. (don't worry I threw a bit of coolant down the tubes before each start attempt to lube parts. Its also still loud as heck because the exhaust gaskets are on order so its leaking noise from every nook and cranny... This thing sure is a piece of work but I plan to make it shine this coming winter. Should be fun...
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Post by Jet⚡Black on Apr 21, 2012 19:29:14 GMT -6
Cool, glad to hear it got sorted out.
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Post by eaglerider on Apr 21, 2012 20:50:27 GMT -6
 Idle should be 1150 - 1200 RPM. Glad that problem is fixed...good job.
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Post by revelations on Apr 23, 2012 17:04:42 GMT -6
How do you know what size jets you have? Also I have a plug over my pilot jet do you all reccomend replacing that again if I need to change my pilot jet?
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Post by Blaine on Apr 23, 2012 17:19:14 GMT -6
How do you know what size jets you have? Also I have a plug over my pilot jet do you all reccomend replacing that again if I need to change my pilot jet? The size is stamped on the face of the jet.Standard size #125.Leave the plug out of your idle jet so you can make adjustments if needed.Most don't need to change the size of the pilot jet.But it will need to be cleaned or replaced if installing a new kit.   |
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Post by Jet⚡Black on Apr 23, 2012 20:35:37 GMT -6
Since you have the covers still intact it's safe to assume the PO never changed the carbs from stock; so they should still have the stock sizes intact.
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Post by revelations on Apr 25, 2012 11:25:26 GMT -6
I rebuilt the carbs using rebuild kits so I replaced the plugs myself.
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Post by Jet⚡Black on Apr 25, 2012 18:15:40 GMT -6
Gotcha, I wouldn't have put the air/pilot plugs back in myself.
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Post by revelations on Apr 25, 2012 22:08:44 GMT -6
Well when I put them back in, I was thinking that as long as I keep the bike clean and detail every once in a while they are almost pointless... But they are easy to take out so all is good. Its just a little RTV holding them in there.
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Don't let it intimidate you at all; a combustion motor is pretty much all the same: They Need: Oil, Air, spark, and Fuel that's it no matter what motor. If it isn't running it's either friction, or starving for fuel or air or bloated from fuel and air...simple stuff. 
Idle should be 1150 - 1200 RPM. Glad that problem is fixed...good job.
