Question about Harley Davidson XL 1200 C Sportster Custom Motorcycles

1 Answer

Sportster bogs off idle

Hi My sportster is fitted with a dynojet thunder slide kit, had a #45 pilot jet which I changed to a #42. Fuel screw 2.5 turn out and still bog off idle when warmed up and blipping the throttle. If I close the fuel screw all the way(clock wise) there is very little change in engine speed. Any ideas please. Thank You.

Posted by Anonymous on

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1 Answer

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  • Harley Davidson Master
  • 48,024 Answers

Hi Anonymous, give the nice folks at dynojet a call. Have nice day.

Posted on Jun 01, 2015

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6 Suggested Answers

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Posted on Jan 02, 2017

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flh1
  • 36 Answers

SOURCE: acceleration problem

If you are not running an open or free flowing exhaust go back to the stock size jets but use the DynoJet parts instead of the stock.
DJ jets tend to run bigger than oem jets

Posted on Jan 29, 2009

  • 3567 Answers

SOURCE: bogs down at 25 30 mph 1st gear 45 in 2nd gear

  • Check to see that the choke is not partially on.
  • Drain the carbs and clean them with B12 chemtool or any other good carb cleaner. The main jets in the carbs are probably gummed up. To clean the carbs properly they will need to be removed from the bike. Be sure to balance and synchronize the carbs when reinstalling.
  • Remove and clean the petcock water trap and clean the trap of water and rust etc. If a filter screen is present clean it as well.
  • Set idle speed to factory specs. Do not use gas with Ethanol.
This should fix the bog problem.

Posted on Mar 17, 2009

  • 1 Answer

SOURCE: bogging 1994 Suzuki RM 125

i have the same problem on the exact same bike

Posted on Jul 02, 2009

voodoomox
  • 1689 Answers

SOURCE: what is a good carb set up on a 2005 yz125 with

this will depend on what gas oil mixture you have

check this topic out.

http://www.dirtrider.net/forums3/showthread.php?threadid=117838

http://forums.dirtrider.com/70/7640379/yamaha-dirt-bikes/yz125-carb-settings/index.html

regards,

voodoo

Posted on Jul 08, 2009

  • 331 Answers

SOURCE: 1985 yamaha moto 4 200 power surges

Check the carbs if all jets are well placed, needles all at same height, float levels equal, collars between carbs and cil head all tight, rubbers not punctured or broken...

Posted on Aug 22, 2009

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1 Answer

Put a new Yoshi pipe on my 05 WR450. Re-jet it but still bogs down in the low end and idles like it wants to die. issue with the needle valve? i cant figure out if it has too much air and not enough fuel...


try it with the choke on, if this helps it is lean
Try again with the hot start lever, if this helps it is rich
dynojet sell a good jet kit with pilots, mains and 2 needles(not needle valves)
sounds rich at idle

May 09, 2011 | 2005 Yamaha WR 450 F

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What size dynojet main jets are required for honda cbr 600 91-94 in the UK bike fitted with K n N filter and viper end can , and how many turns out on fuel mixture screw. ( lost my instructions) thanks,...


HI A DYNOJET KIT INCLUDES MORE THAN JUST MAIN JETS, AIR CORRECTORS, SLIDE NEEDLES, AND IN SOME CASES NEW SLIDE SPRINGS ARE INCLUDED, SLIDE LIFT HOLES ARE ALSO DRILLED OUT TO GIVE QUICKER THROTTLE RESPONSE, AS DAFT AS IT MAY SEEM YOU NEW MAIN JETS IN MOST CASES WILL BE SMALLER THAN THE ORIGINAL JETS, IF YOU ARE THINKING YOUR BIKE HAS BEEN DYNOJETED BUT ARE NOT SURE CONTACK DYNOJET UK FOR HELP, HOPE THIS IS OF USE FOR YOU,
http://www.dynojet.co.uk/jetkits/index.htm

Oct 27, 2010 | Honda Cb 400 F Motorcycles

1 Answer

Hi,just got a dynojet stage 1/3 kit for my 1980 honda cb650, it's on standard air box, but 4 into 1 exhaust, I take it I should use the stage one kit. Also I have no instructions can you help...


Intended for motorcycles with a stock engine using the stock airbox, air filter and stock pipe. Stage 1 kits are fully adjustable to allow the use of a well designed aftermarket pipes and stock replacement air filters like K&N. Stage 1 kits are designed to improve throttle response and driveability and in most cases power increases of approximately 5% throughout the entire power range can be achieved.


STAGE ONE INSTRUCTIONS
1. Remove the vacuum slide from the carbs. Remove the stock needles & spacers, noting the order of
assembly. Locate the slide lift holes (Fig. A), with the slide drill DD# 14 supplied, enlarge your slide lift
holes. The picture may not show your slide exactly, enlarge your slide lift hole or holes depending on your
model. Do not drill any new lift holes. Do not drill the needle hole.
2. Install Dynojet needles on groove #4, using all stock spacers. Install the Dynojet washers (2 per
needle) above the E-clip.
3. Remove the stock main jets and replace with the Dynojet main jets provided. If you are running with
stock exhaust, use the DJ110 main jets. With an aftermarket header or slip-on with high flowing baffles,
use the DJ116 main jets. Be sure that the jets you are changing are the main jets.
4. Locate the fuel mixture plug (Fig. B), if you see a screw head, proceed to adjusting procedure. With the
DD #5/32 drill bit provided, carefully drill thru the plugs. Note: the mixture screw is directly underneath this
plug, be ready to pull back on the drill the instant you break thru. Use screw provided to secure and
remove the plug. Carefully turn mixture screws clockwise until they seat, turn out 3 turns.


For further info on this, visit: http://www.dynojet.com/jetkits/motorcycle/honda.aspx

You can find the manual for the model you are searching for. Follow the 1st column "CC" to find 650cc models and you can find your specific model after that.

Thanks for asking.
Regards,
Arvind S Iyer

Oct 15, 2010 | Dynojet Cycling

1 Answer

1985 Yamaha Virago 1000 (not XJ 900 F) Put stage 1 kit in about 3 years ago and have made about 30 adjustments with no luck. Motors idles fine. Upon acceleration between Off idle and 2500 rpm motor...


Hi, Rdrudolph1 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.
ViragoTechForum com Yamaha Virago XV Forums That Rock
Carburator Theory and Tuning
Yamaha 1986 XV1000 Service Manual
OEM parts for Yamaha
Yamaha 1989 XV1000 Owner Manual

Aug 07, 2010 | Yamaha XJ 900 F Motorcycles

1 Answer

Have a 03 vmax 1200 has ufo 4-2 exhaust and holeshot stage one jet kit- ran good all last year and month this year since winter. doesnt want to idle well and when i role the throttle it bogs right down- no...


Sounds like you PILOT jets are gummed up. try to run it with the choke on and see if it runs better. what happens is, when the pilot jets are clogged they dont let enough fuel through to allow it to idle. also, when you roll the throttle on then the venturi lets more air through and the jets aren't allowing enough fuel to accomodate the increase in air flow causing the bog down.

Apr 30, 2010 | 2003 Yamaha V-Max

3 Answers

My Sabre has Cobra pipes and a Jet Kit, but I can not get the bike to stop popping when I let off the throttle-Any Help?


its likley to be running a bit to week,, try opening up the fule mix screw just a bit to let in more fule

Apr 03, 2010 | 2001 Honda VT 1100 C2 Shadow Sabre

1 Answer

Kx 85 04,bike had a slight bog when throttle was gassed then i cleaned the carb,now it really bogs and running very rich.i also messed with the air & idle screws hoping i could fix the problem &...


Start with setting the air and throttle screws. Turn each one inward until it GENTLY seats. Back each one out one and one half turns. Clean the air filter and starter plunger. The plunger may need to be rebuilt or replaced. Check the pilot and main jet sizes. There will be a number stamped on the side of the jets. The pilot jet should be #45, the main jet should be #140.

Aug 01, 2009 | 2004 kawasaki KX 125

1 Answer

How to remove idle jet? I need to check the size of my idle jet and if necessary change it as bike stalls when rolling on throttle from idle, adjusted idle speed and idle mix but stalling and carb spit...


The idle jet is located in the bottom of the car. it's the recessed one in the bottom of the body. Remove your air cleaner assembly. remove the four screws. Be careful because it will be full of gas. ( well vented area.) You'll have one jet sticking out. That's your main. right next to it is a recessed jet . That is your idle. you'll have to use a small flathead screw driver to get it out. Make sure you have god pressure on the jet to break it loose. The jet itself is brass, and you don't want to mess it up. You should probably have a 45 jet with your combo. if you've been messing with the mixture screw it should be set around 1 & 1/2 turns out from lightly seated.

Jun 26, 2009 | 2006 Harley Davidson XL 1200 C Sportster...

1 Answer

Hesitates on take off and sometimes during low speed in town traffic


If it's a carb model, try increasing the size of the pilot (low speed) jet to a 42 or 45. And pull the sheet metal plug out of the idle mix screw well so you can adjust the idle mixture. Start at about 2 turns out from all the way in. A Yost power tube or similar kit will have all the instructions and parts you need. If it's a fuel injected model...good luck. Harley has problems with their FI. You can get the dealership to re-map the ignition and fuel parameters, but it's kinda hit or miss.

Jun 09, 2009 | 2000 Harley Davidson FLHTCUI Electra Glide...

1 Answer

Acceleration problem


If you are not running an open or free flowing exhaust go back to the stock size jets but use the DynoJet parts instead of the stock.
DJ jets tend to run bigger than oem jets

Jan 28, 2009 | 2005 Harley Davidson XL 1200 C Sportster...

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