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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 12-25-2012, 12:37 AM   #1 (permalink)
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Gas fumes

I put a Monza cap on by bike and now I smell gas fumes much stronger. Also, when I took the tank off and tilted it toward the cap, it leaked. Is this normal? Or did I not get it tight enough?


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Old 12-25-2012, 09:36 AM   #2 (permalink)
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Also, could this be what suddenly caused me to drop fuel mileage? Right after I put this cap on I went from 42 to about 35 mpg. Doesn't seem likely but I can't think of anything else.


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Old 12-25-2012, 01:03 PM   #3 (permalink)
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Some possible reasons for the smell of gas are dealt with on the thread below. The increased consumption however, is a mystery.

Did you reconnect the breather hose to the tank after removal?:

http://www.triumphrat.net/twins-tech...and-fumes.html

Last edited by Forchetto; 12-25-2012 at 01:16 PM.
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Old 12-25-2012, 05:16 PM   #4 (permalink)
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Quote:
Originally Posted by TX1911fan View Post
Also, could this be what suddenly caused me to drop fuel mileage? Right after I put this cap on I went from 42 to about 35 mpg. Doesn't seem likely but I can't think of anything else.


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If you've had the tank off, I'll take a bet that you haven't connected the quick connect fuel hose under the tank properly. It is a bit difficult to get at and still see what you are doing. This would account for both fumes and high mpg.

Push the quick connect hose on until you feel or hear it 'click', then make sure that the orange locking clip is slid back into place.
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Old 12-25-2012, 06:49 PM   #5 (permalink)
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I'm pretty sure the hose is correct. This is the third time I've had the tank off. I heard the click but I'll check.

Edit: Breather hose on. Fuel line secure. One thing I notice is I fill t a little more full now. Maybe it's sloshing out?

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Last edited by TX1911fan; 12-25-2012 at 11:07 PM.
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Old 12-25-2012, 11:57 PM   #6 (permalink)
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Yep - same problem. I agonized over the cost, finally pulled the trigger, only to be totally disappointed by an obvious defect. The smell of fumes pretty much ruined the experience for me. Finally called it quits and purchase the upgraded Triumph cap with the scalloped edge. Problem fixed but the combination cost me big time. Glad to sell the useless Mozna for cheap to any non-smoker!
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Old 12-25-2012, 11:57 PM   #7 (permalink)
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Quote:
Originally Posted by TX1911fan View Post
One thing I notice is I fill t a little more full now. Maybe it's sloshing out?
The handbook tells you not to fill beyond the bottom of the filler neck. This is because overfilling coupled with expansion due to heat causes some fuel to overflow out of the breather hose.

Although the hose plugs in at the bottom of the tank it terminates in an opening just below the filler cap where it acts as a breather and also an overflow.
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Old 12-26-2012, 05:03 PM   #8 (permalink)
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I had the same problem at first after fitting the Monza gas cap years ago, excess fumes and reduced MPG.

soon realised I had not fitted the breather hose beneath the tank correctly and was also overfilling the tank. changed my refueling habit to just fill to the bottom of the filler tank, as Forchetto's post eliminates most of the fumes and excess fuel use

also by design the cap is vented to allow excess pressure out and air into the tank

did you fit the cork gasket and washers correctly? also instructions are available to fit the cap so it does not vent in order to allow the tank to breathe through the charcoal cannister if fitted

I love my Monza cap. its a thing of beauty and really enhances the look of the bike
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Old 12-27-2012, 12:09 AM   #9 (permalink)
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Pretty sure it was fitted correctly. I think the fact that I use a windscreen allowed a small amount of fumes to fill the quiet air right behind the screen - and right below my nose.

I agree it was a thing of beauty, but the constant smell of fumes was much more than I bargained for.
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Old 12-28-2012, 11:55 AM   #10 (permalink)
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I'm going to try putting a little less fuel in. I think that is the cause of most of the fumes. We'll see if it is also the cause of the lower mpg. I don't mind burning up the fuel with my right hand , but I don't want to just waste it.


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