barrytr4 Posted June 4, 2021 Report Share Posted June 4, 2021 Hi Chums I also have vintages motorbikes as well as my Tr4, They have all been i running fine on 95 for years,, if a tad sooty exhausts ,,,,,I had just run a full tank over 2 days about 300K ? in my 1962 500cc Velocette Venom clubman it ran fine to whole time , but two day ago filled up w/ Caltex (Chevron?) 95 , It didn't run good from the start and got progressively worse as the run of 70ks went on , the last 5 ks it was really bad, I was thinking I wasn't going to make it, it was like the choke was 1/2 on, when I got back it wouldn't start again, I striped the carby no prob' and points all good, but the plug was very sooty, I put a next step up hotter one in and dropped the fuel Jet needle a notch then drained the Caltex and put some Vibe 91 petrol ( which the Tr4 didn't like) and now running fine again, any comments on this would be welcome, I have a feeling ?? the cheaper petrol may have less additives in it that would make better for vintage vehicle?? only a feeling--Barry Quote Link to post Share on other sites
Ralph Whitaker Posted June 4, 2021 Report Share Posted June 4, 2021 Hi Barry, I cannot comment on the relative merits of the fuel you are using, but are they adding Ethanol to your fuels down there, and in what quantities? I understand it burns hotter and your symptoms do sound like plugs overheating. Ralph Quote Link to post Share on other sites
Harbottle Posted June 4, 2021 Report Share Posted June 4, 2021 I believe it burns not only hotter but faster like you have got a petrol leak! Paul Quote Link to post Share on other sites
Hamish Posted June 4, 2021 Report Share Posted June 4, 2021 sounds like a duff tank of fuel. the cheaper stuff may be "fresher" as the station has a quicker turn around with more customers.thus works. i must admit i only use shell v-power (the premium stuff) typically from a busy petrol station. H Quote Link to post Share on other sites
barrytr4 Posted June 4, 2021 Author Report Share Posted June 4, 2021 Hi Mates thanks the replies so far, the plug to me looked like it was too cold ,thats why I put the hotter plug in, thinking more heat less soot, the s/ station I used was really expensive, looked like the dearest in Aust', so you might have something there Hamish, just come back from a test run, it ran very well, but , it seemed a bit harder to start, on 91 now--Barry Quote Link to post Share on other sites
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