just bought a gs125 engine for my adrenaline, need help with servicing

**impulsive** · 08-17-2013, 03:09 PM

just bought a gs125 engine for my pulse adrenaline £50

engine.jpg

just wondering if you guys can give me some tips on what i would need for a good service(tools and parts), i got new spark plug and gasket set(no valve seals) and im not really looking for more power yet(unless it dont cost much!) i have never serviced a bike engine but am keen to give it a go!

**humanbeing** · 08-18-2013, 07:53 AM

Which model (F4??) ?
http://www.motorfans.com.cn/bbs/view...uthorid=217223 difference btw the old & new type
-
Rebuild a fu**ed Hyosung
http://www.motoyes.net/bbs/forum.php...=1&authorid=27

**impulsive** · 08-18-2013, 09:46 AM

Originally Posted by humanbeing

Which model (F4??) ?
http://www.motorfans.com.cn/bbs/view...uthorid=217223 difference btw the old & new type
-
Rebuild a fu**ed Hyosung
http://www.motoyes.net/bbs/forum.php...=1&authorid=27

thanks for reply yes f4 engine but i dont understand that link its all in chinese

**impulsive** · 08-19-2013, 10:53 AM

Originally Posted by hossman

Hey guys,hope someone can help...my bike turns on OK,and chain spins but gears wont engage...engine revs and chain stops when in neutral.can shift throught out gears just wont engage

this is my thread go and make your own :P

**spencer2004** · 08-19-2013, 08:12 PM

If you plan on fitting new gaskets it wouldn't hurt to fit new piston rings too. Depending on the mileage of the engine it might also be a good time to replace the clutch plates too. Apart from that just check each part for signs of damage or extreme wear and tear and replace them if necessary. Obviously change the oil and oil filter too.

If you want to go a little bit deeper you could grind the valves so that they make a better seal, you would need some valve grinding compound, a valve grinding stick and a valve spring compressor so unless if the valve seats are especially work it's probably not worth it. During your top end rebuild you could do some intake and exhaust porting and polishing if you want a bit of free performance and if you have a dermal handy.

Moving away from the engine for a bit more performance on the cheap you could get a 38mm cone filter and a 105 main jet for your crab.