A forum for owners of Yamaha TTR250 trail and enduro bikes!

JuJu · Veteran Member

What type of fuel do you run?

Cubber · Super Guru

In UK we only have a choice between ordinary and super leaded, unless you can source the expensive un-leaded supplies which are few and very far between.

I usually re-fill with the cheapest available. biggrin

If your bike was running well on 91 octain and now doesn't run very well on 95 octane then, as long as you have changed nothing else, your suspicion has to be on the petrol.

I have read that with the 5% ethanol additive currently being supplied the petrol has a shelf life of just a few weeks before it seems to lose its volatility. It also dissolves certain plastics, fibres and metals in an alarming way. bleh

My old BSA petrol tank is away for refurbishment having been attacked. The Petseal coating has been dissolved by the modern UK petrol and the tank started leaking again. hmm

Martyn

djkitchen · Member

Cubber wrote:

I have read that with the 5% ethanol additive currently being supplied the petrol has a shelf life of just a few weeks before it seems to lose its volatility. It also dissolves certain plastics, fibres and metals in an alarming way.
My old BSA petrol tank is away for refurbishment having been attacked. The Petseal coating has been dissolved by the modern UK petrol and the tank started leaking again.
Martyn

I had this problem on a tank that was rusted inside, I selaed it and 6 months later had a big lump of goo in my tank!

On the original question, The standard unleaded in the uk is 95, and the expensive posh stuff is between 97 and 99 depending on the supplier, I use the cheapest availble in trail bikes!

JuJu · Veteran Member

In Australia we have 3 types 91, 95 and less common 98, all Unleaded.

No Leaded fuel is available.

For 10 litres of fuel the the difference between the higher RON equates to less than $2,

Our ATM fees in Oz cost more than that!

-- Edited by JuJu on Thursday 17th of May 2012 11:44:16 AM

JuJu · Veteran Member

Cubber wrote:
If your bike was running well on 91 octain and now doesn't run very well on 95 octane then, as long as you have changed nothing else, your suspicion has to be on the petrol.

It's the other way round, the old girl runs better on the higher Octane but is harder to start when cold, having said this the bloody thing fired straight away tonight disbelief

BM Steve · Guru

I just run Standard Unleaded here, if I run the higher octains I get popping etc... doesen't seem to make any difference to the starting though, first push everytime smile

Steve

TTRfan · Super Guru

I user Super Unleaded on the 325 and ordinary in the other TTR250s.

Brian

JuJu · Veteran Member

BM Steve wrote:
I just run Standard Unleaded here, if I run the higher octains I get popping etc... doesen't seem to make any difference to the starting though, first push everytime
Steve

Went out for a spin last night and noticed the popping you are talking about. The starting issue has sorted itself out, now fires up instantly. I can't help but thinking that since I have owned the bike I have burnt out a heap of residue throughout the engine. It runs better each time I ride it

-- Edited by JuJu on Saturday 19th of May 2012 01:15:29 AM

truslack · Veteran Member

Cubber wrote:
In UK we only have a choice between ordinary and super leaded, unless you can source the expensive un-leaded supplies which are few and very far between.

You've got it the wrong way round there Martyn, we're on unleaded it's leaded that's hard to come by.

wobbly · Veteran Member

I run the cheap standard stuff and all is very well, starts first time and runs spot on.

Cubber · Super Guru

Correct, Truslack.

I blame my "senior moments" which occur with more regularity nowadays.

Sometimes they meld into a whole day, I think! confuse

Martyn