Burninator Posted July 31, 2007 #1 Posted July 31, 2007 My 86 Venture Royale will not go much above 5500 to 6000 rpm in 4th and 5th gear. It seems to hit a wall and won't go any faster. Can anyone suggest what the cause is and how to fix it. Is it a timing problem or weak valve springs causing the valves to float at high rpm? Otherwise the motor starts right away, runs very smoothly. I am probably not getting the acceleration that I should at the lower range but as this is my first Venture I have nothing to compare it with. At this time, my V-Star 1100 Classic has far more top end. Help!!
tiny84 Posted July 31, 2007 #2 Posted July 31, 2007 its funny i'm having this exact same problem. did your bike sit for any length of time? mine was in pieces for the past 6 years. I just keep running seafoam through it every other tank and my accelleration and top speed seems to steadly get better.
Phaedrus Posted July 31, 2007 #3 Posted July 31, 2007 It sounds like it could be either a spark timing issue, or a fuel restriction. Check your spark timing, then try a new fuel filter after you run the seafoam through it. Check for rust in the tank that may be plugging things up. To check for rust let the bike sit overnight, then drain som fuel into a clear container. Then shake up the tank and do it again. There should be no sediment in the bottom of the container either time. Any sediment at all is a problem.
Cutty Posted July 31, 2007 #5 Posted July 31, 2007 If you tried all of the above, check fuel filter, electric pump pressure, carb slides action and main carb jets. I had this to happen on two bikes, 75 KZ 900 small CLEAR stone in main jet ( looked like gas bubble) and 82 GS1100 GK Suzuki ( to much oil on K&N filter).
tiny84 Posted July 31, 2007 #6 Posted July 31, 2007 i have one slide in the carbs sticks a lil its whats causing my bike to have to rev high to get her movin. didn't think it would be effecting my top speed just sticking a lil when trying to leave a stop. looks like its time to track down a new slide. dont need the rubber diagphram just the plastic tube that it attaches to. anyone got a parts bike they wanna sell one of those slides? lol
BuddyRich Posted July 31, 2007 #7 Posted July 31, 2007 JOIN THE DARK SIDE LUKE, We have now walls on 2nd gens. Just kidding. Check the airfilter box. Those first gens are real particular about holes and such in it.
tiny84 Posted July 31, 2007 #8 Posted July 31, 2007 I dont have an air filter box... I have 4 chrome 48mm air filters. would this cause the issue?
muffinman Posted July 31, 2007 #9 Posted July 31, 2007 First of all good replies to the main question but have any of you thought to do the wide open throttle set up that is in the service manual? if the throttle plates are not opening fully the bike will not reach top speed. Just my suggestion Tiny if you are not getting enough vac on the upper side of the carbs the engine will not perform up to its full potential If the scoots only problem is top end I would not thing that the mini air filters would be the problem unless they are restricting the flow Jeff
Squeeze Posted July 31, 2007 #10 Posted July 31, 2007 I dont have an air filter box... I have 4 chrome 48mm air filters. would this cause the issue? to make a long Answer short .... YES !!!!! Not it can cause, it IS causing Problems, when the Carbs are not rejetted properly to this Setup.
tiny84 Posted July 31, 2007 #11 Posted July 31, 2007 ok i'll throw the stock box back on tonight and see if it corrects the issue. i remember gaining alot of speed once i put em on but i also patched on of the carb diaphrams when i did it so it might have been counter productive.
Burninator Posted July 31, 2007 Author #12 Posted July 31, 2007 I have a new K&N filter. What is seafoam?
GeorgeS Posted August 1, 2007 #13 Posted August 1, 2007 Replace your Diaphrams, Check idle mixture adjust needle valves, ( 2 1/8 turns open ) Replace the Stock Air box. Drain the bowls. Drain the Gas Tank. Replace fuel Filter. Do a Carb Sync. Then go from there:
Rocket Posted August 1, 2007 #14 Posted August 1, 2007 I have a new K&N filter. What is seafoam? Here is one link about it, you can use the search bar to find more threads mentioning it. http://www.venturerider.org/forum/showthread.php?t=9825
KiteSquid Posted August 1, 2007 #15 Posted August 1, 2007 What is seafoam? http://www.seafoamsales.com/images/updates_smallwhite.gif Sea Foam is a motor treatment. Lots of info from the manufacturer is here: http://www.seafoamsales.com/ You can get it at most auto parts stores.
Squeeze Posted August 5, 2007 #16 Posted August 5, 2007 ok i'll throw the stock box back on tonight and see if it corrects the issue. i remember gaining alot of speed once i put em on but i also patched on of the carb diaphrams when i did it so it might have been counter productive. Is there any Update on that Issue ?
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