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post #1 of 12 (permalink) Old 04-19-2019, 03:45 PM Thread Starter
Supersport 600
Main Motorcycle: 1972 T100R Daytona
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Today started really well. I brimmed the tank and covered 88 miles before I needed reserve. Back home for lunch & chores and then to the petrol station for the afternoon ride. Filling the tank again revealed the bike had achieved 62 mpg with mixed riding, I’m happy with that.

The afternoon ride lasted about a float bowl’s worth of fuel before it was obvious that something was very wrong. A slight misfire quickly followed by really heavy pinking and smoke billowing out of the exhausts. I pulled over, catastrophic head gasket failure was my first thought but the smoke smelt odd…I’d filled it with diesel!

I wasn’t far from my local pub and with help from friends we drained the float bowls and fuel tank leaving a small amount of inaccessible diesel still in the tank. I pushed the bike back to the petrol station and filled up with the correct fuel, after many tickles and kicks it started but with lots of smoke. Eventually this died down and after a few test rides it seemed that all was well again.

I can’t believe that I’ve been this stupid, my only excuse is that the premium unleaded and diesel pumps are next to each other and habit took over (I have diesel car). I’ll be out again tomorrow so I’ll see how that goes. I do hope the Triumph Gods are smiling upon me.
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Last edited by Rusty1; 04-19-2019 at 04:08 PM.
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post #2 of 12 (permalink) Old 04-19-2019, 04:10 PM
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Hee hee

I started to do that once, but after about 2 seconds I smelled the diesel and stopped!

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post #3 of 12 (permalink) Old 04-19-2019, 10:45 PM
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proves...Triumphs are not agricultural!!!

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post #4 of 12 (permalink) Old 04-20-2019, 01:26 AM
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Seen it happen more than once!
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post #5 of 12 (permalink) Old 04-21-2019, 04:24 AM
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Rusty,i like your fuel experiments and could you fill with paraffin next to see if that runs well. I used parafin mix with petrol on a scooter in the 70s and it ran fairly well but a bit smokey and hard to start.
I doubt you will make the diesel mistake again.

Now,where did that bit fall off ?
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post #6 of 12 (permalink) Old 04-21-2019, 09:17 AM
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Iíve almost done that a couple of times. I wager itís burned into your brain and you wonít make the same mistake again.
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post #7 of 12 (permalink) Old 04-21-2019, 09:35 AM Thread Starter
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You are both absolutely correct. I was horrified at the pinking & smoke and really thought that my time had come for an engine rebuild. I was both relieved and angry when I realised what Iíd done.

I took it out yesterday for a cautious run and all was good except for traces of smoke from the exhaust and slight pinking pulling up hills. I drained off more fuel and brimmed it again, we couldnít get all the diesel out of the tank. Todayís 50 mile run was much better, no smoke and running as it did before this incident.
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post #8 of 12 (permalink) Old 04-21-2019, 10:15 AM
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I'd call that a senior moment. I've had two in the last two weeks.
First one I was making some beer with a pre-made wort that was expensive but I thought it was worth a try for some better tasting stuff. After pouring this into the fermenter I suddenly realised I'd left the tap on and lost some before getting it closed. So I had to add less water and get a few less bottles on that one. I may have committed this crime before I think.
Second one I was changing the oil and filter on the Diesel Pug, got it all ready , started pouring in the oil and suddenly realised I'd forgotten to put the drain plug back in. Must have lost about 3 litres of new , very expensive synthetic oil. Senior moments Dude. That's the first time I've ever done that trick. I couldn't imagine how many oil changes I've done in my life but it's probably 5 figures.
Just hoping it's not one of those things that goes in threes.
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post #9 of 12 (permalink) Old 04-21-2019, 11:43 AM
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I dumped a couple of second's worth of diesel into a bike once and then went OH NO, WHAT AM I DOING?!!!

Nothing blew up but I always watch what I'm doing at the pump after that one.
Once was enough.
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post #10 of 12 (permalink) Old 04-21-2019, 11:58 AM
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I did that once in a girlfriends father's pickup.... The other way is worse though (petrol into a diesel)...
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