pulse adrenaline 150cc big bore kit fitted

[offtheclockuk]

Hi offtheclockuk.
I'm thinking of doing this to my Apache 2010 plate. It needs some TLC so I'm thinking of doing all this too.
Could you help me out in terms of which one you ordered (link if you could please!) And any advice or do's/donts. And from what I've read there doesn't seem to be any top end speed increase at all?
Basically, is it worth doing? Thanks in advance buddy.

hi bud,

not much to add over what spencer2004 said, the low end and midrange torque is up, head flow is restrictive at high rpms, 65-70 mph is about top.

to be fair with the change of sprockets i had done, the top speed is up on standard as the bike was rediculously short geared when i got it, 9000rpm at 55mph,
now i can cruise along at 55 at around 1/2 to 3/4 throttle at about 6000rpm, i dont think im even going to bother trying to recover the last few rpms ive lost at the top end because of the bigger piston on the standard rod, probably not good for the engine to keep revving high anyway.

well worth the conversion if youre a big lad like me and act like an air brake perched on top of the bike, the grunt is welcome, great not fishing for lower gears on hills and into the wind

james

[theconister]

it there a bigger kit for these bikes than the 150cc kit ? can you just get the 150 head kit and just bore that head even bigger ? or can i just get my 125 head bored bigger ? whats best to do i want kit bigger than a 150 and if there is one what do i have to do to the engine for it to cope i e new cam shaft and con rod much help need thanks iv done a thred be nice to answer questions on that rathere than this thred thanks thred name is 125 motorcross engine performance or some thing long them lines

[MJH]

I do not know Conner I have a 200cc so the topic never interested me that much, I just noticed that one member on the forum bored his out his 125 to 150cc.

You seemed to have found the thread…

[spencer2004]

Here is a 188cc big bore kit http://item.taobao.com/item.htm?spm=...id=14901325189

The cylinder head is only designed for a 125cc cylinder so it will create a bottleneck which will limit the maximum revs so in other words the top end will be terrible. The seller reccommends a different camshaft to increace air flow but he only sells a cam for the EN125 engines whereas yours is a GS125, the en cam looks like it will fit but I don't know how well it will perform. A cylinder head with bigger valves will also help with that problem but that is kind of an untouched subject on this forum.

[humanbeing]

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[Faria]

hi what the expected power with that 150cc big bore?

[theconister]

yes thanks mate so that 188cc bore where can i get a camshaft and con rod to fit ? and that 188cc bore has he just bored out his standard 125 head ? i do mechanics at college you see and i can get all engine work and stuff done for free ie boreing skim head polish and porting exc just wondering if i can just get my standard 125 head bored bigger than a 150cc then ?

[spencer2004]

It would probably be less hassle to just buy the whole kit, my 150cc kit cost about £70 - £80 delivered. If you bore it out your self you would still need the bigger piston, piston rings and gaskets to go with it which you would have to get from china anyway.

[Biker1234]

Hi nice thread,im looking to buy a 150cc big bore kit for my Superbyke RMR 125 and i've found this one on Ebay 130949704487 eBay item number would this fit my bike and if so what type of piston will it need the seller has flat top pistons and raised?

[spencer2004]

Yes that one will fit your bike, you need to ask for a flat piston.