Question about 2003 Yamaha V-Max

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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 power- dont think could be main jet issue cause run good fuel and just installed the jet kit july 2009 anyone run into this before?

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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.

Posted on Apr 30, 2010

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1 Answer

I took off air box added airpods with stock exhaust on a 1981 suzuki gs 650 what size main jets should i replace with


Richard, I would suggest you go with a stage 3 jet kit for improved air flow. Ebay has them for a great deal. I'll post a link. Good luck. ^^
Dynojet Stage 3 Jet Kit For Suzuki GS650 GS 650 1981 1982
25827945-ug2cc0zr24d5nrk3krvdzvs0-1-0.jpg

Aug 18, 2015 | Suzuki Motorcycles

1 Answer

Harley davidson schematics


That's a wide open answer. Is it totally stock with the crossover pipe in the exhaust ( 95)? Do you have two into one racing pipes ( 110)? Do you have drag pipes ( do you want it to idle or run good wide open throttle?)(125) ? Do you have stock air filter? Stock ignition? Dynojet kit?
The correct answer is to tune it. That means: put it together and ride it for 30 miles ( unless its obviously way off) and check the plugs and adjust and ride it for 30 miles again and check the plugs. Once you get it close you can adjust with idle air screw but my limit is 2 and 1/2 turns out. You get past that you need a bigger jet.

Aug 27, 2014 | Motorcycles

1 Answer

My 1990 VMax 1200 is overheating even with the fan on


Hi, Anonymous and the usual suspects are:
1. Engine oil level and SAE weight are too low or not circulating.
2. Insufficient or blocked air flow over the engine.
3. Heavy combustion chamber carbon deposits.
4. Ignition timing retarded due to faulty MAP, CKP, or CMP sensor.
5. Carburetor jetted too lean.
6. Leaking intake or exhaust valve.
7. Water coolant old or low change every two years.
8. Water pump failure.
9. Radiator clogged, cap loose or malfunctioning.
10. Radiator fans not coming on.
11. Clutch slipping, brakes dragging, heavy load, towing a trailer etc.
12. Idling too long without moving.
13. For constant hot weather temperatures, mountain, or desert riding conditions consider adding an oil cooler and or cylinder head cooler.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
overheating VMaxForum net
http://www.starvmax.com/kunena/12-general-vmax-discussion/31217-vmax-overheating
http://www.vmaxoutlaw.com/tech/VMX12-Service-Manual.pdf
OEM parts for Yamaha
http://www.vmaxoutlaw.com/tech/owners_manual.pdf

Oct 25, 2013 | 2000 Yamaha V-Max

1 Answer

I have a yamaha xj650 maxim which was a project of mine and it will not idle below 2500 rpms. There have been many add ons though 4 to 1 exhaust free flow air filters clean carbs added stage 3 dyno jet kit...


I would recommend adjusting the idle screw on the carb. If it is not the idle adjustment, then check the choke as it may be sticking and that will cause the engine to idle at that rate.

Feb 28, 2011 | 1982 Yamaha XJ 650

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

No problem would like more power. told too put on vmax carbs and intakes. what do u think? have all ready changed the cams and springs.


Ideally you could have taken the engine out of Vmax. Then you would have the high performance cams,carbs, and the ever important counter balancer shaft (in the Vmax and the original Venture,but not in the Royal Star even though it is machined for it.) The only other thing you need is a more free flowing exhaust. As for the carbs you may be able to just put in a performance jet kit.

Sep 02, 2010 | 1996 Yamaha Royal Star XVZ 1300 A

1 Answer

Can you comment on how to increase horsepower on a 1998 1300 Tour Cruiser, at a reasonable cost.


This is a question asked about a decade too late, unfortunately. The 1996-1998 Standards, Tour Classics, and Tour Deluxes benefited greatly from Yamahas' decision NOT to offer the VMax in Europe and Asia with V-Boost - leaving non-US customers some 50+ horsepower down. The VMax had the look BUT they were being blown away by any literbike on the market, and, worse yet, couldn't compete with the Honda V65 Magna, a bike similarly styled and engineered, introduced four years earlier, and thoroughly "shaken out".

Aftermarket to the rescue! Big Air kits, cams, titanium lifter buckets, four-into-four low restriction exhausts, high-capacity water, oil and fuel pumps, tunable ignition systems, oversize front and rear shocks and springs - the best part for Royal Star riders was that many of the accessories were available for their bikes, because of the similarities between the 1200cc VMax and 1300cc Royal Star engines and suspensions.

Now, however, the older VMaxes are historic footnotes, and the Royal Stars haven't received anything but cosmetic upgrades since 1999. The market for Royal Star performance parts in the U.S. is mostly nonexistent; the bikes are usually bought for touring or cruising duties, not stoplight-to-stoplight bashes; reliability, comfort and appearance are the Royal Star's strengths.

I owned a 1998 Tour Deluxe, and searched the Internet for the parts I had used to personalize it. The two survivors of the last decade seem to be: Baron Stealth Big Air Kit - $249.95 (http://www.baroncustom.com/), and Dynatek Dyna 3000 digital ignition $289.99 http://www.dynaonline.com/). Competition Cams dropped their cams, springs, and lifters, and both Bub and Cobra dropped their 4-into-4 and 4-into-2 exhausts. Some of the exhausts are still available for 99- Royal Stars, but that's no help for you.

Jan 31, 2010 | 1998 Yamaha Royal Star XVZ 1300 A

2 Answers

1998 Sportster XLH 1200 seems too smoky. Carb, including jets were checked - ok. Not visible smoke, but just gives rider that exhaust smell even after short trips. 14 k miles and recently serviced. Is this...


Is this a recent development? Or has it always left that smell? I had an older Sporty, that I ran too rich for years, it left lots of black soot on the inside of the exhaust tips, and a very pungent exhaust smell on your person. When I went down a couple jet sizes, it got much nicer, and ran a little better as well.

Jul 27, 2009 | 2000 Harley Davidson XL 1200 S Sportster...

2 Answers

I got a 1990 Suzuki GSX750F Katana, the problem is that when I pull the choke out and start it up it will idle, now if I take right off it rides great, but when I come to a stop or hold the clutch long...


It still sounds like it still running rich. If it doesn't have any performance mods like aftermarket exhaust it wont like the stage 3 kit. The stage 3 kit should be install if it has high performance exhaust and k&n pods instead of an airbox and filter. Or the floats may be stuck or improperly adjusted.

Jun 21, 2009 | 1997 BMW R 80 R

1 Answer

Have an 06 Suzuki Katana 750. when I start it with full choke it runs fine, then when I go to ride (choke off) it has a low idle and stalls out. I have to go full choke for it to warm up for over 30 min....


Not for sure but u might try to re jet the bike.i own a 98 suzuki bandit 600s and it also is really cold hearted. those bikes are unfortunately known for that problem.not that it was much help but u might try contacting Dales Holeshot Performance he specializes those types of bikes he also sells the jet kits.
i would also try to adjust the idle slightly higher hope this at least helps

Dec 29, 2008 | 2006 Suzuki GSX 750 F (Katana)

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