Best upgrade Motor

[general]

I see all these motors GPX, OGM, Lifan.... wanted to know which is easiest to install.... looking for around 140~160cc and i just want motor, if i geta motor a that size i should be ding 60+ w/o anymore upgrades besides bigger exhaust cause of bigger motor...

[Blitz$M.Inc.$]

personally, im going 150 or 160 gpx for my next motor
you might have an easier time with the 150 ogm, it has standard intake and exhaust angles
ill just get whatever i need to make the motor work, ive got a gpx 125 and its a nice motor

[general]

personally, im going 150 or 160 gpx for my next motor
you might have an easier time with the 150 ogm, it has standard intake and exhaust angles
ill just get whatever i need to make the motor work, ive got a gpx 125 and its a nice motor

Why, gpx 150-160 is it cuz you got the custom exhaust already?

[Blitz$M.Inc.$]

no cuz i like the gpx brand and dont mind going all out, i would need a klx exhaust or get an adapter thats all

[Holeshotz Performance]

You should also take this into consideration

http://holeshotzperformance.com/product-info.php?pid124.html

It is a almost identical copy of this if that tells you anything

http://holeshotzperformance.com/product-info.php?pid126.html

[general]

You should also take this into consideration

http://holeshotzperformance.com/product-info.php?pid124.html

It is a almost identical copy of this if that tells you anything

http://holeshotzperformance.com/product-info.php?pid126.html

Holes i shot you guys a PM, email @ Sales@HoleshotzPerformance.com and left Voicemail...bout your x19 in stock

[X7rocks]

a built GPX 125 definatly runs insane
thats if ur going under 150cc
anything over theres gonna be alote more cash to deal with

[general]

na 130~150 is good with me aslong as i can do 60~70mph w/o WOT like 95% of it dont want to run the motor in to the ground to do 70mph...
so with 150cc good exhaust, might add IRK, Spark Plug, i should b fine

[general]

K, got email...hole

[Holeshotz Performance]

Holes i shot you guys a PM, email @ Sales@HoleshotzPerformance.com and left Voicemail...bout your x19 in stock

Just so you know, we close at 5 PM. I checked the voice mail this morning and saw that you called at around 6:30. I will be around until 12 or 1 today if you want to call.

As far as the motor, unless you are on a really tight budget or need to meet a displacement requirement, don't waste your time with anything under 150cc's.

[X7rocks]

na 130~150 is good with me aslong as i can do 60~70mph w/o WOT like 95% of it dont want to run the motor in to the ground to do 70mph...
so with 150cc good exhaust, might add IRK, Spark Plug, i should b fine

yeah thats the thing though a slightly modified 140 or 125 motor runs better then a stock 150
the 125's and such do have a bit more rpms to work with and not sure if anyone will agree with this on me but i just find the 150 motors to be more suited for dirtbike use since all the torgue is just used on them to get up the jumps guicker

dont get me wrong i wouldnt mind getting a gpx 160 strokeing it then try to make it to 200cc just for a drag bike
but thats only if i save up for a few years bluelaugh

[general]

yeah thats the thing though a slightly modified 140 or 125 motor runs better then a stock 150
the 125's and such do have a bit more rpms to work with and not sure if anyone will agree with this on me but i just find the 150 motors to be more suited for dirtbike use since all the torgue is just used on them to get up the jumps guicker

dont get me wrong i wouldnt mind getting a gpx 160 strokeing it then try to make it to 200cc just for a drag bike
but thats only if i save up for a few years bluelaugh

Yeah but cost wise, a tune 125 140 will cost as much or more 150.. so why not pass all theextra parts and timeto put it 2gether

[The Nutty Professor]

It all in the pudding. If you lighten the internals of a 150cc so it spins up faster the torque advantage goes away but the displacement doesn't and the 125cc and the 140cc lose. I'm not talking about a lot of go-fast on the 150cc I just mean lighten the crank weight and IRK it and all the others are toasted pop-tarts. Throw in the ability later on of going medival on the KLX topend that some of the 150cc are sportin' and it ain't a fair fight no matter how you look at it.

[general]

It all in the pudding. If you lighten the internals of a 150cc so it spins up faster the torque advantage goes away but the displacement doesn't and the 125cc and the 140cc lose. I'm not talking about a lot of go-fast on the 150cc I just mean lighten the crank weight and IRK it and all the others are toasted pop-tarts. Throw in the ability later on of going medival on the KLX topend that some of the 150cc are sportin' and it ain't a fair fight no matter how you look at it.

:confused: Huh? what? You lost me from I'm not talking about...and to the end..if i pu a IRK in the150cc i will smoke all, i think thats what im reading:confused:

[general]

Also, i cam across this website was tring to pick a motor...for x19

http://tboltusa.com/store/index.php?cPath=21&osCsid=bf627c7e0fa3cf0726af002d44465d56

[X7rocks]

there are lots of sites like planetminis selling built 146 motors for cheaper then new 150s and they will flat out be good enough for what your asking
plus if your rdeing your bike realizeing your doing over 60 isnt a joke so instead of looking for a powerfull motor try looking for a way to make the bike more stable

[Blitz$M.Inc.$]

i hit 73 with a low compression 125cc gpx and 17/28 gearing
didnt even feel fast, i was ready for more
wouldnt be here if i wrecked it tho, you be dunskees

[general]

k, thx alot guys :)

[X7rocks]

It all in the pudding. If you lighten the internals of a 150cc so it spins up faster the torque advantage goes away but the displacement doesn't and the 125cc and the 140cc lose. I'm not talking about a lot of go-fast on the 150cc I just mean lighten the crank weight and IRK it and all the others are toasted pop-tarts. Throw in the ability later on of going medival on the KLX topend that some of the 150cc are sportin' and it ain't a fair fight no matter how you look at it.

from the work doug did to my motor it seems to rev a bit faster then normal

[xxlarge420]

i have a modified OGM 140cc with lots of mods to both the engine and bike itself and as of right now my bike is faster top speed and in accelleration than my friends bike, (i think its an X19), that has a stock 150cc engine. im not sure if its the GPX or the OGM 150, but it is the one that doesnt come with the IRK stock so he can use his electronics. granted i do have a little more money invested and alot more mods done to my OGM 140 engine than my buddy has in his 150 engine. but with almost the exact same sprockets on both bikes my bike, the 140, is faster in accelleration and top speed than the bike with the 150 and i weigh 15lbs more than my friend does. so depending on how your cash flo is remember that u can always do some mods later to make a 140 or a 125 engine very fast. but like the old saying goes "there is no replacement for displacement". like when i bought my 140, a while ago, it was the most powerful engine and was the largest displacement engine available at the time for sale. if i was going to purchase a new engine now i would probably buy the GPX 160cc w KLX hybrid head and just modify a few parts a little to get everything to fit nicely. that engine should fly even stock.

[general]

http://holeshotzperformance.com/product-info.php?pid125.html


Is this the motor everyones talking bout gpx with klk or something like that

[The Nutty Professor]

Yes. It's a CRF, KLX hybrid. The bottom end is CRF and the topend is KLX. That's what I have except in 150cc. All the guys (experts) who seem to know what they're talking about say the Lifan is way better out of the box but when it comes to later modifications the OMG and the GPX will type hybrid will blow it into the weeds. The next part I have to say is only what I've read I have no direct experience with it. The 150cc without the IRK seem to be coming apart or at least the cranks do and they just seem to be having all kinds of problems with the 160cc and 165cc motors no matter who makes them. Is that the truth dunno I'm just repeating what I've read on more than one occasion. Oh and sorry about that general sometimes I write with only half the info in a sentence because I think everyone knows what the hell I'm talking about already. It's a hard habit to break.

[Holeshotz Performance]

Yes. It's a CRF, KLX hybrid. The bottom end is CRF and the topend is KLX. That's what I have except in 150cc. All the guys (experts) who seem to know what they're talking about say the Lifan is way better out of the box but when it comes to later modifications the OMG and the GPX will type hybrid will blow it into the weeds. The next part I have to say is only what I've read I have no direct experience with it. The 150cc without the IRK seem to be coming apart or at least the cranks do and they just seem to be having all kinds of problems with the 160cc and 165cc motors no matter who makes them. Is that the truth dunno I'm just repeating what I've read on more than one occasion. Oh and sorry about that general sometimes I write with only half the info in a sentence because I think everyone knows what the hell I'm talking about already. It's a hard habit to break.

Based on my experience, I would have to agree as far as the Lifan's being better out of the box however again like you said you are really limited as far as bolt on modifications for the Lifan 140 & 150 motors due to the awkward cylinder size on the 140 and limits with the head unless you want to get into custom machine work which is very costly.

The KLX hybrids are nice becasue of all the bolt on's available such as the TB BBK and roller rocker head that has 30/24.5 valves in comparison to the Lifan's 23/27.

I personally have not had any issues with the KLX hybrid motors as far as crank failures or anything like that but then again I have not really had a chance to push any of them too hard either.

I am going to try and do a Takegawa 178 build using the GPX 160 bottom end and this package:

http://holeshotzperformance.com/product-info.php?pid127.html

sometime in the following weeks. With a IRK and good carb + exhaust setup it should be good for over 20 HP.