Posts
1306
Joined
8/17/2011
Location
805, CA
US
Edited Date/Time
1/26/2012 10:11am
so ive been riding an 02 yz 125 for the last couple months after getting back into riding after a 5year break...
been having so much fun on that bike...but i could definitely use a little more power on the bottom..bike is currently bone stock motor wise. im a bigger guy at 180-190lbs and ride tracks thats are pretty deep and loamy with big hills/ uphill jumps and as one of the only 2strokes on the track most of the lines are formed up from 450s so it makes it hard to stay on the pipe when all the ruts are really squared off with decent sized jumps after them..
im gonna go with the eric gorr 144 kit in the near future..
my question/ what im unsure of is how i want the power delivery... im looking for some input from people who have ridden these motors...
im gonna run pumpgas
im leaning towards the wider powerband. My only concern is that im going to lose that midrange hit that makes the bike so fun to ride..
I feel like if i go with the more mid/top power its not going to give me what im looking for... the hit now is plenty of power i just want it to come on sooner...there is one stepup on the track with a righthander into a single with a short runup to the stepup...3rd tapped wont get over it but i cant stay on the pipe in 4th due to the short uphill runup and the fact that i have to hit the turn before in 2nd
if i get it ported for broader power am i going to lose that hit in the midrange or does it still retain the hit and just give u more power everywhere else?
when i get the bigbore is the stock pipe still ok? Would u guys recommend running vforce reeds and cage? Have a baby coming in a couple months so if i can get away with the stock pipe/reeds saving the xtra $ would be ideal
any input would be appreciated..
been having so much fun on that bike...but i could definitely use a little more power on the bottom..bike is currently bone stock motor wise. im a bigger guy at 180-190lbs and ride tracks thats are pretty deep and loamy with big hills/ uphill jumps and as one of the only 2strokes on the track most of the lines are formed up from 450s so it makes it hard to stay on the pipe when all the ruts are really squared off with decent sized jumps after them..
im gonna go with the eric gorr 144 kit in the near future..
my question/ what im unsure of is how i want the power delivery... im looking for some input from people who have ridden these motors...
im gonna run pumpgas
im leaning towards the wider powerband. My only concern is that im going to lose that midrange hit that makes the bike so fun to ride..
I feel like if i go with the more mid/top power its not going to give me what im looking for... the hit now is plenty of power i just want it to come on sooner...there is one stepup on the track with a righthander into a single with a short runup to the stepup...3rd tapped wont get over it but i cant stay on the pipe in 4th due to the short uphill runup and the fact that i have to hit the turn before in 2nd
if i get it ported for broader power am i going to lose that hit in the midrange or does it still retain the hit and just give u more power everywhere else?
when i get the bigbore is the stock pipe still ok? Would u guys recommend running vforce reeds and cage? Have a baby coming in a couple months so if i can get away with the stock pipe/reeds saving the xtra $ would be ideal
any input would be appreciated..
It's a blast to ride. He also included a 14 tooth counter sprocket because it will easily pull it....
I spent a weekend at Cycle Ranch last month, which is very hilly by Texas standards, and I had no problem with the hills and was easily jumping the double step up the entire time. Plenty of guys won't jump it on bigger bikes.....
In my experience, the trick to reaching him by phone is the CALL EARLY before he starts working in the shop.
The Shop
Free shipping: VITALMX
DeCal Works Huge Plastic Inventory of UFO and Polisport kits.
Luxon 4-Post Bar Mounts
$189.95 - $239.95
Have you altered the gearing at all??
Sell it and buy a barely used 250,
the 02-04 yams were great bikes, only thing you can fault them on is the 5 speed box! i gear mine down to 12-51 as you can sometimes feel you are inbetween gears (most of the tracks I ride are fairly slow compared to the tracks in the states)
i've got a 2003 yz 125, and absolutely love it!! Even as standard the motor was great, as long as you keep it on the pipe. The 5 speed box isnt as good performance wise as the 99 and 05 onwards yam 6 speed boxes are, but they are pretty much bulletproof!
I tend to use it mainly for hardpack riding- I'm 6ft 1 and around 210ibs, so decided to have eric bore and port the motor, and send me a stroker crank (to make it 155). Should be finishing putting it together today- will put some pics and video's up and a review when its done. I've already had eric work on my rm 250 motor (to make it a 300) - went for the mo better powerband and high comp head to run on race fuel on that one, but gone for top end power and high comp head to run on race fuel on this one! I think it will be a blast to ride, cant wait to test it on my new track next week!!
One of the last things that caught my eye was his discounts he has listed on his order form. He offers a 10% discount to Active and retired military, police, fireman and emts. I appreciate the fact that he is giving back to those who give to all of us. Luckily I can be a recipient of the discount as a recent military retiree. For that support alone he will earn my business. I thank him for thanking those who give willingly everyday to make our lives safer...
As far as the eric gorr kit vs the athena- I'd go with gorr every time. If you're doing gncc's then go for the mo better tuning and high comp head, itll give the power a much more useable spread for the tight woods type riding. Thats the powerband i went with for the rm 300- makes it much easier to roll on the power in the tight stuff, but will still rev through and hasnt lost its 2 stroke characteristics.
Pit Row
I looked at his 4-stroke motor packages and was wondering if anyone has used him for their thumpers?
He says on his site that after he rebuilds them it almost doubles the life span
Using a tuner like Eric Gorr will let you decide the type of power you want the motor to make, then after the cylinder is bored out to the selected size, the proper port timing can be set to allow the motor to make proper use of the extra cc's.
Hope this helps, good luck!
Eric says going as far as 167 makes the bike alot slower revving (so it loses its 125 characteristics)- he recommended the 155 kit to me, saying its the best one to go for. We've had it ported for top end power (so you still have to ride it like a 125) and its got a high comp head (to run on race fuel)
The 300 kit we got for my rm 250 we had ported for smoother, broader power- it still revs like a 2 stroke, but has much more useable bottom end power, and no savage mid range hit. On Erics custom wiseco pistons theres a window that you can drill out if you want the mid range hit back- but doing this loses some over rev. Again, we went for the high comp head. Absolutely love the bike as it is!
Alot of big bore kits are renowned for having flat spots in the power, thats normally due to incorrect porting, or incorrect squish. When eric does big bore kits he ports it to where you want the power (bottom end torqe for enduro, smoother broader power with no mid range hit or more over rev) and then you decide what fuel you want to use which will determine how high compression you can run (you can run higher omp with rae fuel, or REALLY high comp with bioethanol)
give eric a call- he's very helpful and certainly knows what he's doing! HE's hand ported thousands of motors, and been doing it for decades! you wont be disappointed!
Was a awesome piece of kit.
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