fuel leak

DevonCbx · Post by **DevonCbx** » Fri Sep 05, 2008 6:19 pm

I've has a fuel leak that comes and goes. I had replaced the rubber fuel line of the petcock. It had a slight crack in the old rubber. I thought that this had solved the problem. Unfortunetly not. Sometimes when I run the bike, there are no leaks but other times fuel leaks along the front bracket. There is no fuel leaking from the over flow tubes of the float bowls. Last year I did have the carbs seperated. I'm wondering if an o ring might be leaking. Could they leak from time to time by shrinking or expanding from heat or something? Does anybody know all the possible ways that could create a leak in the bank of carbs? I really cannot see where it is coming from.

Thanks

alimey4u2 · Post by **alimey4u2** » Fri Sep 05, 2008 7:54 pm

Any localised wetted areas to pinpoint the source ?? Drops of grease at certain points will show where it may be coming from. The fuel will dissolve the grease....

David Davenport · Post by **David Davenport** » Sun Sep 07, 2008 10:06 pm

Sure sounds like a leaky o ring on a fuel transfer pipe, I had the same symptoms on mine. Took time with the fuel tank removed and a flashlight to pin the leak down (fed the gas through a funnel into the line). Took the carbs off in the end and replaced all the o rings even though only one was leaking, the other rings were very brittle. Just like yours the leak would come and go...it did happen more often as time went on. Hope that gives you one possible area to look at!!!!

Spent many a day cruising around Honnington/Exeter/Cornwall before crossing the pond...a nice part of the country...enjoy it!

David Davenport · Post by **David Davenport** » Sun Sep 07, 2008 10:10 pm

Whooops...just noticed you are located in Canada....thought you were from Devon, England!

EMS · Post by **EMS** » Mon Sep 08, 2008 7:38 am

I must admit, I have never, ever, broken a bank of carbs apart. It would be interesting to have a post by someone who did and tell us what difficulties were encountered putting it together and make it work again

How about it, Dave

cbxtacy · Post by **cbxtacy** » Mon Sep 08, 2008 8:52 am

Oop's, I have three spare sets of carbs. Two are for project bikes. I guess the third set are coming apart. It's been over 10 years since I've had a set apart. I do have fond memories of the last time.

Dave Ditner · Post by **Dave Ditner** » Tue Sep 09, 2008 11:23 pm

EMS wrote:I must admit, I have never, ever, broken a bank of carbs apart. It would be interesting to have a post by someone who did and tell us what difficulties were encountered putting it together and make it work again How about it, Dave

What a royal pain in the ass!!!!!!!! It's clearly not something you want to contemplate lightly, unless of course you're leaking fuel and have to replace all the O rings. Haven't done it in about three years, so let me get a set of carbs here where I can look at them to refresh my memory and I'll have a go at it for you. Give me a day or two.

David Davenport · Post by **David Davenport** » Thu Sep 11, 2008 2:07 am

In regard to the carb fuel/air o ring replacement it was not that difficult... Mike Nixon's 'book' does a great job and the o ring kit from Tims worked fine. Disconnecting the handle bar, 'dropping' the headlight allowed slack in the cables.(the engine is released forward as normal on a jack with all the normal disconnects) The carb's were then slid out with cloth protection underneath to prevent scratching and placed at the side of the bike on a large plastic drum. It was nice not to play around with the cable adjustment later as that has always been a 'pain' for me. If the carb's are out you may as well replace all the rings as you know it will come back to bite you! Some of the carb's you can pull apart a little.... replace the rings and slip them back together without totaly pulling them apart. Heat gun and silicone worked great for popping the carbs back on. Hope that helps anyone out there ....not sure if it's the correct way but it did work...give yourself plenty of time, follow the Honda manual for shaft/plate removal. Don't get too frustrated and try to enjoy the journey. Great website folks for a great bike!!!!!!!!!