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Discussion Starter · #1 ·
hey guys wondering if you can help, i have a derbi gpr 125 ( derestricted ) with full arrow pipe system and im just wondering if i should still be using the recommended br8es spark plug? or should i go for something else?

i read on another post somewhere that you may need to change sparkplug to something higher afer de restricting it....

thanks guys,

rich
 

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Old post i know but you require a B10ES after the fuse is put in, otherwise the plug runs too hot leading to detonaltion.
We learned this the hard way.

Glyn
wish id bothered reading this far back before i put the fuse in the other day absolutely melted the spark plug, luckily it caused minimal damage was expecting a top engine rebuild!

is this why or is this a coincidence?

cheers!
 

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Bringing back LONG dead threads
haha
i had this original thought...

HOWEVER it would be better than starting a new thread with old information, and i kind of wish id read this before having to fork out to get my bike fixed, if this was even why it happens, it does seem to fit...

but i do agree overall, sorry, ive just read the dates of the post :palm head:
 

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this has got me thinking with the trouble im having with mine... iv got the fuse in & running stock plug. with having the same problems as someone els on here right befor his blew up to...
 

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i had this original thought...

HOWEVER it would be better than starting a new thread with old information, and i kind of wish id read this before having to fork out to get my bike fixed, if this was even why it happens, it does seem to fit...

but i do agree overall, sorry, ive just read the dates of the post :palm head:
Tbh, it's better than starting a new thread then being raped over not using the search function (However sh*te it is)

Well done for finding it though
 

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I'm running the fuse with a BR8ES, no problems.
ahh, good to hear! i imagine you give your bike alot of abuse on the track aswell, so again.. good to hear that.

Awesome picture you have aswell
 

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I have to wonder at least a little about fuel quality. Were you running high octane fuel when the failure occured? I'm running derestricted with an Arrow pipe and standard plug with thousands of miles on the bike with no issues. Lots of us have run our bikes hard with standard plug with nary a problem, but I always use high octane fuel.
 

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I have to wonder at least a little about fuel quality. Were you running high octane fuel when the failure occured? I'm running derestricted with an Arrow pipe and standard plug with thousands of miles on the bike with no issues. Lots of us have run our bikes hard with standard plug with nary a problem, but I always use high octane fuel.
How high is high? Over here we only get 93 and 95. I always try to fill up with 95 but it isn't always available everywhere.
 

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the 98 is perfect for the bike, and good 2 stroke oil
i have br8es has more then 4000Km still works great, no problem startin in the morning use the bike everyday to go to work.
 

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the 98 is perfect for the bike, and good 2 stroke oil
i have br8es has more then 4000Km
Agreed. 98 would probably be a much better choice for you. Over here in the states, we use a different octane rating system than you. I use 93 octane which would be roughly equivalent to 98 for you. And yes, it makes a BIG difference in a 2 smoke. Detonation is the death knell of a 2 smoke and higher octane helps keep it at bay. The cost of a top end rebuild far outweighs the few pence extra you'll pay at the pump.
 

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Agreed. 98 would probably be a much better choice for you. Over here in the states, we use a different octane rating system than you. I use 93 octane which would be roughly equivalent to 98 for you. And yes, it makes a BIG difference in a 2 smoke. Detonation is the death knell of a 2 smoke and higher octane helps keep it at bay. The cost of a top end rebuild far outweighs the few pence extra you'll pay at the pump.
thanks, ill run the tank out and give it a go,

i had sort of dismissed it as petrol companies trying to get more money from me!
 

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Agreed. 98 would probably be a much better choice for you. Over here in the states, we use a different octane rating system than you. I use 93 octane which would be roughly equivalent to 98 for you. And yes, it makes a BIG difference in a 2 smoke. Detonation is the death knell of a 2 smoke and higher octane helps keep it at bay. The cost of a top end rebuild far outweighs the few pence extra you'll pay at the pump.
And 2t's run Ooooooh so much better on the high octane fuels..... I used 95 because I wasn't overly impressed by using high octane fuels on prod engines (I'm a lot more familiar with 4t's). However a friend who eats, sleeps and f*cks 2t's disabused me. I started using 98RON and OMG did it fly !! Lot less smoke as well, cleaner burn.
 

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Back to which plug- A BR10 left me stranded 60 miles from home. I've run the BR8 since with zero problems.
 
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