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TOPIC: What petrol to use................

Re:What petrol to use................ 9 years 2 months ago #16411

  • Groenie
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Dick wrote:
Maw ek gaan dalk een of ander tyd valves moet vervang? Scoot het 56 000 km op unleaded gedoen!!! Wat kos so operasie rofweg Groenie?

Jy kyk na so R1200 vir nuwe valves, seats, guides en seals. Dan moet jy ook die gaskets vervang (head gasket ~ R250) Check die lengtes van die balancer en cam chains ook terwyl die engine oop is. Hulle is so R2500 stuk, maar op 56K behoort hulle nog fine te wees. Ek gaan myne binnekort ook moet doen, maar ek wil GROOT gaan, sommer 705 grooot.
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What petrol to use................ 2 years 4 months ago #109066

  • DENTON
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Hi all, did some searching and found this info about fuel types. My question is about LRP that is getting more and more scarce. If I change to unleaded, should I add some sort of additive?
I have a 1991 fugly and just went over 100k km. Any help appreciated.
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What petrol to use................ 2 years 4 months ago #109067

  • capeklr
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Japan where the KLR comes from has unleaded fuel since the 1960's.
The KLR is designed for unleaded.
You should only put unleaded into your KLR.
"The world is a book and those who do not travel read only one page."
St Augustine
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What petrol to use................ 2 years 4 months ago #109072

  • DENTON
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Thanks Jorg, but what about the lead in the fuel that is apparently good for the valves as reported earlier in this post? It is very confusing information. I have been using LRP for the last 5 years with no issues. Can I just change? Do i wait until it is nearly empty and then fill with unleaded? :unsure:
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What petrol to use................ 2 years 4 months ago #109077

  • Piet
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DENTON wrote:
Thanks Jorg, but what about the lead in the fuel that is apparently good for the valves as reported earlier in this post? It is very confusing information. I have been using LRP for the last 5 years with no issues. Can I just change? Do i wait until it is nearly empty and then fill with unleaded? :unsure:
You see, that is the thing about forums - you are getting unreviewed opinions and not (necessarily) facts! :whistle: :laugh:

My opinion is that you should not encounter any issue if you just switch to unleaded. Whether on an empty or half-full tank.
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What petrol to use................ 2 years 4 months ago #109121

  • Kalahari Pete
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Interesting topic.

I was at Rand burg Motorcycles to get oil for regular oil change before the Naboom bash. Got talking to owner Danie and as I understand it they had had a training clinic from the Motul boys (also my choice of oil but let's not go there).

Apparently - the guys explained to them about the effects of unleaded fuels on valves (just as mentioned by doc) and that the best thing to do - in fact it is their recommendation - is to add 2ml of full synthetic 2 stroke oil per litre of petrol.

So on an empty KLR tank - around 40ml. You will have to wing it depending on how full your tank is when you top up.

This apparently protects the valves, bike runs smoother - my guess is it may assist rust in the tank but it's only my afterthought guess

Suckered or not - I did it. Motul Full Synthetic 2T is expensive but it will last me a long long time.

I don't know if it was my imagination but the bike ran sweet on the trip to Naboom and back and if anything the concept makes sense. Google'd it and it seems it is not witch doctor theory.

The 2T does what the lead did with some added benefits.

Danie said the guys suggested full synthetic as it does not leave the deposits the dinosaur 2T will.

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What petrol to use................ 2 years 4 months ago #109129

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Kalahari Pete wrote:
Interesting topic.

I was at Rand burg Motorcycles to get oil for regular oil change before the Naboom bash. Got talking to owner Danie and as I understand it they had had a training clinic from the Motul boys (also my choice of oil but let's not go there).

Apparently - the guys explained to them about the effects of unleaded fuels on valves (just as mentioned by doc) and that the best thing to do - in fact it is their recommendation - is to add 2ml of full synthetic 2 stroke oil per litre of petrol.

So on an empty KLR tank - around 40ml. You will have to wing it depending on how full your tank is when you top up.

This apparently protects the valves, bike runs smoother - my guess is it may assist rust in the tank but it's only my afterthought guess

Suckered or not - I did it. Motul Full Synthetic 2T is expensive but it will last me a long long time.

I don't know if it was my imagination but the bike ran sweet on the trip to Naboom and back and if anything the concept makes sense. Google'd it and it seems it is not witch doctor theory.

The 2T does what the lead did with some added benefits.

Danie said the guys suggested full synthetic as it does not leave the deposits the dinosaur 2T will.

Cheers
Very interesting, thanks Pete. I don't know who else is on the 4x4 Community, but they have a NUMBER of 100+ page wars going on about adding 2T ("2SO" as they call it) to diesel for modern vehicles!

I guess we can prepare ourselves for a thread like that! ;) :laugh: :laugh:
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What petrol to use................ 2 years 4 months ago #109131

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DENTON wrote:
Thanks Jorg, but what about the lead in the fuel that is apparently good for the valves as reported earlier in this post? It is very confusing information. I have been using LRP for the last 5 years with no issues. Can I just change? Do i wait until it is nearly empty and then fill with unleaded? :unsure:

Doesn't matter it will mix.
"The world is a book and those who do not travel read only one page."
St Augustine
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What petrol to use................ 2 years 4 months ago #109134

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Okay a bit of technical info.
Lead was added to fuel in the past to prevent denotation in engines, commonly known as pinging.
A bit of pinging at low speeds for a short time won't do any damage, but a engine that ping severely
and at high speed, high load will get damaged. Very often a hole in the piston or worse.
In the 1960's in California and Japan they started to do away with leaded fuels because of traffic congestion and the resultant pollution.
It was only on cars at the time, but they got complex system to give of less poisonous gases and the first catalytic converters where fitted as well.
If a vehicle is fitted with a catalytic converter, even half a tank of leaded fuel will damage the catalyst and destroy it making it useless. It can then also get blocked up.
More modern vehicles also have Lamda Sensors in the exhaust system which measure the burnt gasses and adjust the fuel mixture accordingly. These sensors will also be destroyed by leaded fuel very quickly.
Many older cars had cast iron cylinder heads, I don't know of any bikes that had these.
These engines with cast iron heads did not have separate valve seats, they desperately need leaded fuel or LRP to lubricate the valves and seats.
If using unleaded fuel in these engines due to the lack of lubrication on the seat the valves will actually weld themselves shut when they close and the next time the cam forces it open the weld will be broken causing a rough surface which will leak. Burnt valves will result very quickly.
Popular cars are the 3.0L Ford V6, older Ford Escort, 1,6 engines and so on.
Cars and bikes with aluminium cylinder heads always have separate valve seats. so depending on what material these seats are made of they are fine to run unleaded.
"The world is a book and those who do not travel read only one page."
St Augustine
Last Edit: 2 years 4 months ago by capeklr.
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What petrol to use................ 2 years 4 months ago #109139

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Thanks Jorg, feeling a lot easier now about the change :)
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