[1999 Yamaha Royal Star venture running rough]

Sounds like a vacuum leak to me. When you get it running at idle without the choke on (pulled out), spray wd40 around all 4 rubber intake manifolds from the carbs to the engine. If the idle changes at all, there is an air leak somewhere. Simple test and well worth a try.

 

Now that makes sense - went out to the garage and examined the rubber intake manifolds - checked two of them had cracks in the sides of the rubber housing - that might be the problem. This is starting to make sense - now that secret is how big of a pain in the ass this is going to be to replace them ?? I will do the test tomorrow !

[1999 Yamaha Royal Star venture running rough]

How much Seafoam per tank? If the carbs are plugged then a whole can in successive tanks would be called for.

Why only 2 plugs? ah go ahead and do all 4, the two ou didn't do are feeling left out now!

Carb sync might help, but if you can make sure the carbs are clean first, that is better.

 

Don't be afraid to ask for explanations, often times we assume tooo much.

 

Two of the plugs were easy to get too - the other two were hard to get two - probably do it tomorrow !

[1999 Yamaha Royal Star venture running rough]

How long did it sit before running it this time? What "carb cleaner" did you use? Some of that stuff might damage the rubber parts. I use Gumout with PEA and put a whole bottle in a tank when my carbs get plugged bad. After running it a while over several days, it usually clears up.

for a few months used Seafoam also B-12 carb cleaner. Before I added the carb cleaner it would not idle without the choke full on - after replacing the fuel filter and two spark plugs - started running

better - would idle with out choke on - but it still pops when I let off on the gas - and runs rough !

[1999 Yamaha Royal Star venture running rough]

I have a 1999 Royal Star venture Trike with 26,500 miles on it. - it's running rough - would not idle without the choke pulled out -even after it was warm. I changed the fuel filter and two sparks plugs. It never has

ethanol gas in it - It is running rough ,after the carb cleaner was poured in ? it started running a little better but not the way it should. Now what ? Can't seem to find a mic mechanic around where I live -so either I find out what the problems are-

I'm stuck without a mechanic. Any ideas ?

[1999 Royal Star Venture has a problem with choke]

I have a 1999 Royal Star Venture - it has a problem that when I start it I pull the choke out - but I have to keep it out while riding - if I stop the Motorcycle dies - pull out choke restart

runs fine with the choke out - the engine dies when I stop and the choke is pushed in ??