Question about 1994 Yamaha XV 535 Virago DX

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Virago loses power on higher speed ? - 1994 Yamaha XV 535 Virago DX

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I think the boots that is the rubber pipe going on to the engine from the carburettor

ay have a hole or not be sitting quite right , on the side of the engine ,you can test this quite easy ,turn on the bike idle it as normal ,then spray carb cleaner on and around the boots it will make the bike race slightly this means there's a hole and air is been drawn in so mix ratio is wrong so loss of power ,do this to both boots hope this helps

Posted on Apr 23, 2014

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Posted on Jan 02, 2017

messstat
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SOURCE: 83 Yamaha XJ550 hesitating and losing power at higher speed

I had a 1981 XJ650 and I can tell you carburetion is a nightmare on these bikes! While every manufacturer on the planet used Kehnin carbs Yamaha decided to contract with a company that NEVER made carbs before - Hitachi...
Because of the year, it could be several different things, let's start with the easiest/common.
#1. Grab a STRONG flashlight, open the tank and look inside...if you see ANY rust, I recommend removing the tank and Kreme it. #2. Remove the carbs, if you can...take a good look at the carbs "boots" the black manifold(s) between the carbs and back of the engine. If done carefully, it's not too difficult and shouldn't take more than 2hrs. Check the boots for cracks or damage that allows air too leak into the engine during operation...if they are damaged, you'll have to Google carb-parts for Yamaha's? #3. The easiest way to clean the carbs is to go to Advance Auto Parts and buy a can of "SeaFoam" and add it to a tank of gas per instructions (more is NOT better).
Good Luck

Posted on Jun 21, 2009

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Hi, Ramberry and the usual suspects are:
1. Idle speed improperly adjusted.
2. Air fuel mixture screws not properly adjusted.
3. Inlet system air leak.
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I answered this question once but the answer has disappeared into cyberspace. FixYa has a problem with that occasionally. A “very helpful” rating for this answer? Thanks!

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