Re: Bike won't rev properly..

Posted by Re-run on Mar 09, 2012; 2:24pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Bike-won-t-rev-properly-tp3812078p3812791.html

Did the bike sit for a while, possibly for a year of more without starting? It seems fuel related so if you can, maybe dump some seafoam into the gas, probably half a can or so and a few gallons of gas.
Before doing that, pull out the spark plugs and see what they look like. Look at the insulator tip.

It seems like the bike is running pretty lean and if the insulator is really white, then that would be your indicator. I am guessing your dad never opened the carbs up before so I an betting they are dirty from old fuel.
If it still does this after a few good miles, then a deep cleaning is probably in order. When doing this, check all rubber parts for any splits or cracks. Those carbs have an air cutof valve if I remember correctly and if it has cracks in it, it can cause popping.

Check any fuel filters too to make sure they are in working order.

It is hard to tell from the vid but it also sounds like some metal contact but it could just be the audio.
When was the last oil change? Might be time for that too. if you can, drop your oil pan when you do the change and just check it for metal debris. Just in case.

We should have the manual here to download, so do that too.