Main Motorcycle: 2018 Street Triple R
Join Date: May 2014
Location: Hutchinson, Kansas
Help on a '68 Bonneville T120R sound after rebuilding carbs
Hello. I recently purchased a 1968 Triumph Bonneville T120R. It had been sitting for about 2 years before I got it, but the previous owner took great care of it. Over the past month or so, I have been able to get it started, but it would die when given throttle. Yesterday, I rebuilt the Amal 930 carbs and gave them a good cleaning. After reassembly, I started the bike and after a few minutes of kicking it started up. I made the adjustments to the pilot air screws and idle screws and got it running pretty smoothly. I took it down the street and it ran perfectly...for about 2 minutes. I then started hearing a whooshing sound from the left side. I immediately turned it off and coasted home. Now when I attempt to kick it over, I get a loud whooshing sound like I am pushing air. I know that is pretty vague, but before I tear the engine apart diagnosing, I was hoping someone could help me diagnose the problem if they too have experienced the same thing.
One thing I did notice is that the gasket between the head and carbs was much thicker than the replacement in the kit. Another thing is when I was tickling the right carb, it appeared gas was coming out right above the float bowl as well as out of the tickler like normal. Doubt that is what caused the issue, but just thought I would provide the info.
Thanks so much for any help you can give!