Question:
This bike has been off the road and boxed for years.When it last ran it was on leaded petrol. With the unleaded petrol of today do the valves need to be changed or do I need to use a fuel additive or just run it on unleaded. Any advise at this time would be most helpfull as friends seem to have different opinions.Thanking you
Answers:
Take an hacksaw blade and carefully try to cut the valve seat with the hacksaw blade.
If it cuts or scratches, replace the seats, if it does not, wheyhey you are ok.
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Some old valves and seats will last reasonably well on unleaded, some not. It is often the seats which are the problem. Only a marque specialist like LP Williams in Warwick is likely to really know about your particular model and year. If additives do what it says on the tin they are an option. Personally I would replace the items in question during a rebuild. Why risk an extra top end overhaul?here's one for motocross experts...?
It will be a lot easier (and cheaper) to fit hardened valves and seats, whilst you have the engine still out of the bike.where can i get financing/or a loan for a motorcycle?
At least then you can be sure, that even with our lousy modern petrol, your bike will run with no problems.
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Far better to do that now, than to have the valves and seats burn out several months after you've completed the rebuild.
I have an old Tiger 110 and the seats and valves have never been changed. When leaded fuel became scarce I put in a Broquet in the fuel tank and have not have any problems since
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However that said I am also doing up a T140 and as I will have to strip the engine I will have replacement valves and seats fitted
What I feel regarding this is I would not do a strip down to an already perfectly sound engine but one that needed work anyway would get the full treatment
Find a damn good and recommended professional to do this work for you
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The cheapest option is to get a lead additive for the fuel.The best long term option (and dearer) is to get the valve seats replaced with hardened versions.
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my 57 tiger 100 runs on unleaded,it has done for a number of years.when i rebuilt it last winter i checked the valves and springs,all was ok so back it went
its run perfect last year 06
dont worry about it !
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