rjg1985 Posted June 28, 2011 #1 Posted June 28, 2011 I have not started to look for the problem yet, but here are the symptoms. First off I have an 1985 royale with an 87 engine. Did the swap 4th of July weekend 2010 and the bike has run great. Now it starts and runs fine for cruising but when I get the rpms over 4500 it has no power. I used the carbs from the 1200 engine but with larger jets (same as the 1300 carbs would have). It has been running like this since I took it out this spring last year it ran fine. It seems like the timing is not advancing. Any suggestions would be great.
Yammer Dan Posted June 29, 2011 #2 Posted June 29, 2011 Problems after sitting? Have you Sea-Foamed it??
rjg1985 Posted June 29, 2011 Author #3 Posted June 29, 2011 I just did tonight and have not riden yet. Filled the tank at noon today and used it to go see a customer. Cruised down the interstate at 75 mph no problem. Twist it wide open and it does not want to take off like it should. Hopfully the seafoam will help. I would like to find a set of carbs for a 1300 engine. I think my mileage would improve. I only get about 33 mpg the the 1200 carbs.
MasterGuns Posted June 29, 2011 #4 Posted June 29, 2011 Have you checked the vacuum boost sensor? Sounds like it could not be holding a vacuum and therefore not advancing the timing AT ALL.
rjg1985 Posted June 29, 2011 Author #5 Posted June 29, 2011 If the problem persists I will be checking the carb sync and all vacuum lines plus clean the electrical connections this weekend.
GaryZ Posted June 29, 2011 #6 Posted June 29, 2011 My guess: Bad Boost Sensor or maybe bad carb diaphragms
GaryZ Posted June 29, 2011 #8 Posted June 29, 2011 Diaphrams are new Can you see the sliders moving equally?
Marcarl Posted June 29, 2011 #9 Posted June 29, 2011 Just keep it under 4500, these engines work great below 45 although they are amazing around 6000. And oh, don't be cheap with the seafoam,,, pour the whole can in and try to use the tank full over a couple of days so that it has time to clean.
rjg1985 Posted June 29, 2011 Author #10 Posted June 29, 2011 I added seafoam last night and noticed an improvement on the ride to work this morning. I usually put seafoam in the fuel before storage but never got to it last fall.
DavidGrant Posted June 29, 2011 #11 Posted June 29, 2011 I SeaFoam-ed mine and was having the same symptoms you describe. I changed out the plugs and problem gone!
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