Convert 200 to 220 or EG 225 kit

Discussion specific to the 1995 - 2006 KDX200 (H Series) and 1995 - 2005 KDX220R (A Series) models sold in the USA
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C George
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Convert 200 to 220 or EG 225 kit

Post by C George »

Besides the small difference in displacement , whats your thoughts on a slightly modded stk bore " 216 cc "
KDX-220 vs. an Eric Gore 225 kit ?

I still want to convert our 06 / 200 to a larger bore.

I'd want all the bottom end of the 220 , would the 225 low end kit give me that ?

Thanks for any feedback
05 KDX-220R / 06 KDX-225R / Maxima 927 / Millenium Tech / Ron Black / PC , FMF / Many 220 engine mods / 40 + yrs. of riding dirt bikes 🀟🀟
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Convert 200 to 220 or EG 225 kit

Post by kx200 »

I'm sure Eric can set the 225 to have low end but the one I had hit way to hard. It ran more like a KX250. It was ok for the MX track and fast hare scrambles but not good on enduro cross type stuff. It also had a divider plate in the carb. The compression ran at 225 psi.
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Convert 200 to 220 or EG 225 kit

Post by C George »

kx200 wrote:I'm sure Eric can set the 225 to have low end but the one I had hit way to hard. It ran more like a KX250. It was ok for the MX track and fast hare scrambles but not good on enduro cross type stuff. It also had a divider plate in the carb. The compression ran at 225 psi.
Thanks , I definitely don't want it to run like that and I have also heard you have to run race gas. 180 - 200 psi seems about the max needed for these engines.

Maybe the one you had was ported for top end power ??
05 KDX-220R / 06 KDX-225R / Maxima 927 / Millenium Tech / Ron Black / PC , FMF / Many 220 engine mods / 40 + yrs. of riding dirt bikes 🀟🀟
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Re: Convert 200 to 220 or EG 225 kit

Post by B737driver »

my experience was exactly the opposite. My 200 was great on the top end, but lacking on the bottom. I did all the RB mods (head and carb) and was somewhat happy. Then I decided I wanted more.. ...I did the EG 225 kit and it's now a different animal. For me it smoothed out the hit, but makes more power everywhere. Low and mid are now much more usable and the top is better than ever. The EG 225 kit combined with the RB carb is the perfect combo for me. I've got a detailed review on here somewhere.
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Convert 200 to 220 or EG 225 kit

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Re: Convert 200 to 220 or EG 225 kit

Post by C George »

B737driver wrote:my experience was exactly the opposite. My 200 was great on the top end, but lacking on the bottom. I did all the RB mods (head and carb) and was somewhat happy. Then I decided I wanted more.. ...I did the EG 225 kit and it's now a different animal. For me it smoothed out the hit, but makes more power everywhere. Low and mid are now much more usable and the top is better than ever. The EG 225 kit combined with the RB carb is the perfect combo for me. I've got a detailed review on here somewhere.

Do you recall what you asked him for porting ? More everywhere ?

Do you think it runs stronger than a modded 220 ?
05 KDX-220R / 06 KDX-225R / Maxima 927 / Millenium Tech / Ron Black / PC , FMF / Many 220 engine mods / 40 + yrs. of riding dirt bikes 🀟🀟
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Re: Convert 200 to 220 or EG 225 kit

Post by B737driver »

Never ridden a modded out 220. I will just say that I am very happy with what I've got. From what I've heard....I can't imagine a 220 having better low end and definitely not more top end.

I got the MO better everywhere. Couldn't be happier.
Last edited by B737driver on 02:12 pm May 27 2015, edited 1 time in total.
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Re: Convert 200 to 220 or EG 225 kit

Post by C George »

If RB says you can't use a 200 head on a 220 because it's too thin to machine ,

Then how is EG making it work on a 1mm larger bore than a stock 220 ?

200 cylinder heads are available anywhere, not so much with the 220.
05 KDX-220R / 06 KDX-225R / Maxima 927 / Millenium Tech / Ron Black / PC , FMF / Many 220 engine mods / 40 + yrs. of riding dirt bikes 🀟🀟
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Re: Convert 200 to 220 or EG 225 kit

Post by B737driver »

Purely speculation, but other than cylinder size it's possible that the ports are different on the cylinder as well as the head On a 220 vs 200. I would guess that they are. ....

Really not sure....what I do know is that I was really happy with all the RB mods on my bike. Then I got to a point where I wanted a little more. I purchased a cylinder and head from another member and sent it off to EG. Not wanting to mess up what I had, I saved the cylinder and RB modded head in case I wasn't happy with the performace of the EG 225 kit.......I was pleasantly surprised. Imagine really close to 250 mx bike power without the really hard hit. For me the EG 225 kit with the RB modded carb is the perfect combination for a woods bike. Now I want to try out a desert pipe, just to see the difference. I hear that combo is even better.

My advice would be when you need a replate....spend a few $ more and try out the EG 225 kit. FWIW
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Convert 200 to 220 or EG 225 kit

Post by C George »

Without turning this into a pipe debate , I'm very happy with overall power of my 220 with a PC plat 2 pipe.

Yes , RB does excellent work and has incredible customer service.

If he wasn't so busy , I'm sure he could do a 225 kit.
05 KDX-220R / 06 KDX-225R / Maxima 927 / Millenium Tech / Ron Black / PC , FMF / Many 220 engine mods / 40 + yrs. of riding dirt bikes 🀟🀟
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Convert 200 to 220 or EG 225 kit

Post by osobad »

if you use 200 jug you need 200 head and vise versa. Even if you have 200 bored to 220 or 225 you need 200 head. Porting on the 200 is supposed to be better than 220. having had both modded 220 and EG 225 I would pick EG225, but it is close. Both are far better for me than 200. If I had 200 I would go with EG 225 ported for over all. If I had 220 I would do RB mods and port . Either make the bike a different animal
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Re: Convert 200 to 220 or EG 225 kit

Post by C George »

Do you know if the 225 psi compression was with a pump or race gas request ?
05 KDX-220R / 06 KDX-225R / Maxima 927 / Millenium Tech / Ron Black / PC , FMF / Many 220 engine mods / 40 + yrs. of riding dirt bikes 🀟🀟
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Convert 200 to 220 or EG 225 kit

Post by osobad »

pump
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Convert 200 to 220 or EG 225 kit

Post by C George »

osobad wrote:if you use 200 jug you need 200 head and vise versa. Even if you have 200 bored to 220 or 225 you need 200 head. Porting on the 200 is supposed to be better than 220. having had both modded 220 and EG 225 I would pick EG225, but it is close. Both are far better for me than 200. If I had 200 I would go with EG 225 ported for over all. If I had 220 I would do RB mods and port . Either make the bike a different animal

That last sentence is what I'm after as my son is so much better rider " in the woods " on my 220 vs his 200.

I could just ride his bike and save a bunch of money but what fun is that. :cool:
05 KDX-220R / 06 KDX-225R / Maxima 927 / Millenium Tech / Ron Black / PC , FMF / Many 220 engine mods / 40 + yrs. of riding dirt bikes 🀟🀟
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Re: Convert 200 to 220 or EG 225 kit

Post by C George »

Just got a good deal on a 220 top end , things you do for your kids :supz:
05 KDX-220R / 06 KDX-225R / Maxima 927 / Millenium Tech / Ron Black / PC , FMF / Many 220 engine mods / 40 + yrs. of riding dirt bikes 🀟🀟
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Convert 200 to 220 or EG 225 kit

Post by C George »

Slowly putting the 2nd 220 together .

Got the Cylinder and head on today.

Man , is this going to be SO worth it : )
05 KDX-220R / 06 KDX-225R / Maxima 927 / Millenium Tech / Ron Black / PC , FMF / Many 220 engine mods / 40 + yrs. of riding dirt bikes 🀟🀟
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Convert 200 to 220 or EG 225 kit

Post by C George »

Finished it up this afternoon and all I can say is Wow , what a difference over the 200.

This cylinder is much tighter spec'd than mine and you can feel the difference.

I'll have to get my cylinder replated this winter and get it back within spec.

Torque , Torque , Torque , to the degree you forget what gear your in. :supz:

Thanks Ron , one great " experimental " head you made me !

Image
Last edited by C George on 05:30 pm Jul 05 2015, edited 1 time in total.
05 KDX-220R / 06 KDX-225R / Maxima 927 / Millenium Tech / Ron Black / PC , FMF / Many 220 engine mods / 40 + yrs. of riding dirt bikes 🀟🀟
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Convert 200 to 220 or EG 225 kit

Post by C George »

osobad wrote:if you use 200 jug you need 200 head and vise versa. Even if you have 200 bored to 220 or 225 you need 200 head. Porting on the 200 is supposed to be better than 220. having had both modded 220 and EG 225 I would pick EG225, but it is close. Both are far better for me than 200. If I had 200 I would go with EG 225 ported for over all. If I had 220 I would do RB mods and port . Either make the bike a different animal

The 220 porting isn't really that much different , a little more restricted on the intake and boost port but that can
be modded easy enough.

I'm sure the EG kit makes a great bike , just didn't have the $600 to get it done.
05 KDX-220R / 06 KDX-225R / Maxima 927 / Millenium Tech / Ron Black / PC , FMF / Many 220 engine mods / 40 + yrs. of riding dirt bikes 🀟🀟
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Convert 200 to 220 or EG 225 kit

Post by C George »

To Guarantee your 225 kit will run off pump gas , then MHO is you really need to use a 220 head.

If you really don't NEED the screaming top end of a 200 cylinder , then a modded 220 is much more budget
oriented but again " Thats just my opinion ".
Last edited by C George on 09:28 am Sep 21 2015, edited 3 times in total.
05 KDX-220R / 06 KDX-225R / Maxima 927 / Millenium Tech / Ron Black / PC , FMF / Many 220 engine mods / 40 + yrs. of riding dirt bikes 🀟🀟
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Convert 200 to 220 or EG 225 kit

Post by B737driver »

C George wrote:To Guarantee your 225 kit will run off pump gas , then you really NEED to use a 220 head.

Punch your cylinder out to 70mm with replate and pick up a 220 head, :)



:shock:
False.........I don't know why it's so hard to believe that someone had a good experience with the EG 225 kit on a 200, but this statement is misleading. Maybe technology or procedures in machining improved since 2004 when this review was done....or maybe the RB carb jetted correctly prevents detonation.....or maybe I really am just sitting on a ticking time bomb about to blow.

One thing is for certain, as I've said before, I have had great success with the 225 kit. It transformed my KDX into the exact power output and distribution that I was looking for. It's has dramatically better low end, better mid, and the revs just keep going on the top.

Combined with the RB'd carb, it is the best $600 that I've spent on a bike I purchased new in 2004 and plan on keeping until I can't ride anymore.
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