Question about 1995 Suzuki DR 650 RS-E

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I just bought a dr650rs that had been sat for 4 years....... it was running right up until i jetted her out with 160 main jet... thumpertalk advised i leave my airbox cover off as the" motor needs to breathe"......... started up and my god what a note!!!!!!!!!!!!!!!!!! response was astonishing off the throttle........ i then put the airbox cover back on and it died. now it will not budge. theres fuel going in, air suctions good but no spark.......... even new plugs wouldnt do it.... what have i done? going from good to dead in a second, what are these machines prone to? thanks anyone who can solve this mystery

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If there is NO spark at all, it is definately electrical. Any chance when fiddling with the airbox cover that the sidestand switch wiring was disconnected? This acts like a kill switch when stand is lowered. If you have spark you may have to live with leaving the cover off. My '90 DR650RS starts sweetly first kick with the seat off, but struggles when seat is on. When it is hot it will not start with seat on...so I drilled several 1/2" holes in the top of the airbox and problem was solved. I run a CZR muffler with stock carby/#160 jet.
Cheers.

Posted on Nov 04, 2010

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3days ago I bought a110cc auto quad. It's sat for over a year, I have cleaned carburetor,has new spark plug fuelfilter &battery,unstuck the clutchandbrakes.runs, is sluggish only ?ofpower.whatsmissing


Hi Jesse, and the usual suspects are:
1. Idle speed improperly adjusted.
2. Inlet system air leak.
3. Damaged or restricted fuel tank venting system.
4. Dirty or damaged air cleaner element.
5. Accelerator pump inoperative.
6. Vacuum piston assembly malfunction.
7. Enrichner valve not seated or leaking.
8. Restricted fuel supply tract.
9. Plugged bowl vent.
10. Loose or plugged fuel and air jets or passages.
11. Improper fuel level.
12. Worn or damaged needle or needle jet.
13. Loose or plugged main jets or passages.
For more information about your issue please visit the websites below. Good luck and have a nice day.
http://canadattatv.com/wpcontent/media/book/110cc%20&%20125cc%20Service%20Manual.pdf

Sep 30, 2015 | Motorcycles

1 Answer

I had the muffler baffles shortened on my 03 C2 to get a better sound but now it backfires badly.Is there some mod to the carbs i can do????


ok u have better fuel flow with the shortened exhaust you will most likely need to go up a main jet size ur running with too much air in ur mixture running hot and the backfires are when u get to top of ur gear range its starveing it of fuel runing too hot the exhaust is geting super heated and the backfires are as u decelerate right ? thats unburnt fuel hiting ur exhaust and going bang u may even notice flames at exhaust tip the new slightly larger main jet shuld fix this you may have to ajust the main needles up or down to compensate for the jet change asumeing they are adjustable the pilot jet shuld be fine no need to touch anything there

ok so as u running now ur fuel cat emission thing eats petrol and vice versa over fuel a lot the cat will be overwelmed and get eaten by the fuel ur at the other end too much air cat wont be effected but as ur running much hoter then needed your basicly eating your engine from the inside out from the aditional air the new main jet will allow more fuel from the start of midrange to top end u shuld find after this fix the bike will run stronger and faster and cooler from 600 rpm up primerily more at top end

the main jet is the fix as far as i see it but like i say ajusting that to allow more fuel means u also effect midrange to have more fuel more so the more u open the accelorator so you may need to make a minor adjustment positioning ur needles prehaps 1 clip up putting the needle its self a bit closer to the jet thus giving less fuel thats if you have ajustable needles if not u cant ajust midrange but to be honest just that pilot jet shuld put u so close to right u may not even need the midrange ajustment try it 1 size up on all main jets its at the least a big step in the right direction if not a total fix

hope this helps

Oct 29, 2012 | 2003 Honda VT 1100 C2 Shadow Sabre

1 Answer

What size are the factory jets in a 2001 Honda Shadow 600?


Hi, Debbie if you have changed your fuel delivery system, air filter size or flow rate, mufflers or exhaust system or a significant change in altitude your carburetors need re-tuning and if your fuel system (gas tank, filters, fuel valve and carburetor) is contaminated with ethanol sludge, varnish, rust, dirt, water etc. or your bike has been sitting for months or years without running these components must be "PROPERLY" cleaned and reassembled "CORRECTLY" before any adjustments can be made. Tuning your carburetor is fairly simple once you understand the basic principals. You engine is a simple airbox sucking air in and blowing it out, it is finely tuned at the factory for maximum performance once you upset that delicate balance by changing air filters, camshafts or exhaust systems your performance may go down the and the engine may run poorly, you need to compensate the air-fuel mixture in the carburetor in order for the engine to run smoothly and at peak performance. If you are running multi carburetors you need to sync them first and make sure your air cleaner element is clean and dry for paper elements or lightly oiled for foam and meshed elements and properly installed. Here is how and where you compensate trouble: "TIP" if your engine "BOGS" your not getting enough fuel.
1. Closed to 1/8 throttle is managed by the air screw and pilot/slow jet.
2. 1/8 to 1/4 throttle is managed by the air-screw, pilot/slow jet, and throttle slide.
3. 1/4 to 1/2 throttle is managed by the throttle slide and jet needle.
4. 1/2 to 3/4 throttle is managed by the jet needle, needle jet, main jet, and air jet.
5. 3/4 to wide open throttle is managed by the main jet and air jet.
6. Wide open throttle is managed by the main jet.
If you are running lean, spark plug electrode color is white, engine runs hot and feels like it is starving for fuel you need to go up on the jet size or move the c-clip down one notch. If you are running rich, spark plug color is black or dark gray, the engine runs cool, and bogs down when accelerating you need to go down on jet size or move the c-clip up one notch. When your carburetor is properly tuned for maximum performance your spark plug electrode will be a light tan color like coffee with cream. If you prefer fuel economy over performance you can go down on main jet sizes until a satisfactory level of lower performance is acceptable versus MPH, your spark plug color will be whiter and your engine will run warmer. These tuning adjustments will only make improvements if your intake and exhaust system have no air leaks or sealing issues and the entire electrical system is in proper working order and you have no mechanical issues.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
VLX 600 Re Jet
Carburator Theory and Tuning
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Jul 23, 2012 | 2001 Honda VT 600 C Shadow

1 Answer

I got a 2010 ktm 65 sx. Can't keep spark plugs in it. Always fouling them.Mixture is 60;1 What factory recomends. Any help wolud be appreaciated.


Thank you for contacting FixYa with your KTM Inquiry.
More than likely you have a jetting problem. My first thought would be to call the dealer service department and ask what jetting they suggest for the local area you are riding. May or may not be able to advise you and want you to bring it in. Check your user manual and see if any jetting suggestions exist. Pretty easy do it your self fix.
Start by cleaning your air cleaner so it's not drawing excessive fuel to air mixture. Replace fuel filter and confirm gas tank vent tube is not pinched or plugged.
Steps:
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  2. Middle - Needle Jet and Tower. If it runs bad at half throttle to 3/4 this may be allowing over fueling. Simple fix is to lower the slide cir-clip holding the slide to a lower notch allowing the needle to project further down in to the pilot and leaning out the mixture bypassing the needle.
  3. Main Jet - Allows for optimum speed when you have the wire tight at high rpms. If it's fat and not running right go down a size on the main jet. Engine should have a smooth scream.
Jet's are comparatively inexpensive so experiment a bit until you get a cocoa brown spark plug color after a good run. As always make sure your float is working correctly and no shellac exists from winter storage with old gas.
Thanks for contacting FixYa,
TF

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1 Answer

Jeting for 4500 foot elevation on 99 cr 250


The jetting needs to leaner (smaller) in higher elevations.Remove the jets from the carb thru the 17mm drain bolt in the bottom of the bowl using a 6mm socket for the main and a #1 flat screwdriver for the pilot jet and identify the sizes stamped on the jets. Get a selection of smaller jets1- 4 sizes down from what you have. Start with the pilot jet-that controls the idle. Once it idles smoothly with the idle air adjustment screw 1-3 turns out it's good. The main jet should be varified by checking the spark plug- a clean plug with proper jetting should be a nice tan color after 5 min. of running 1/2 to full throttle. If it's white, your'e too lean. If it's black, it's too rich. Remember, 2 strokes will run lean very well right up until they burn down so always check the plug.

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1 Answer

I bought a 99 yamaha yz250 that had two tanks of gas through it it wont idle right and when it is idling it surges this bike is brand new 12 year old bike perfect i dont know what the problem is


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1 Answer

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If my bike sounded mad I would shoot it, but that is a different problem.
It just may be circumstancial having no spark and flooding issues. Most likely some debris was set loose when installing new jets and has fouled the float seat. The neutral indicator lead may have also been dislodged from the loom connection when working on the carby. Check for any damage on the float pins and needle tab (small brass flange), Check plastic floats aren't cracked or split. Check wiring connections from leads exiting crankcases. If the dynojet kit is anything like my sigma6 XT600 kit, I was advised to drill several holes in the airbox lid, or remove the snorkel....they need to breathe.
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