RB vs FRP carb / head mods
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RB vs FRP carb / head mods
I see that both RB designs and FRP (Freddite) have the carb + head mods on their websites. Is there a difference between the two.
FRP: 148 bucks total
65 - head work
83 - carb work
RB designs: 218 bucks total
50 - head work
168 - carb work
I hear a lot about the RB work ( a whole section of this forum is dedicated) but I do not hear much about the FRP work. Can anyone fill me in as I am planning on doing this, and I am intrigued by the large cost diff.
Ian
FRP: 148 bucks total
65 - head work
83 - carb work
RB designs: 218 bucks total
50 - head work
168 - carb work
I hear a lot about the RB work ( a whole section of this forum is dedicated) but I do not hear much about the FRP work. Can anyone fill me in as I am planning on doing this, and I am intrigued by the large cost diff.
Ian
- Julien D
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Re: RB vs FRP carb / head mods
You can look at the details on both sites and see what is included. FRP bores the carb throat and swaps jets. RB bores, adds divider plate, reworks low speed circuit, modifies jet block, modifies slide, new needle, new jets.
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Re: RB vs FRP carb / head mods
OK. Any idea what or how much better the Rob carb works, is it worth it
- fuzzy
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Re: RB vs FRP carb / head mods
Yes, for a 200 I would never even bother with the FRP mod. For at 220 at least youre getting a 36mm bore job. The RB carbs pull off idle like no other. Can't speak to his head work
'91 KDX 200 Project $300 KDX
'95 KDX 200 Project $600 KDX
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'95 KDX 200 Project $600 KDX
'94 WR 250 Always a project
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Re: RB vs FRP carb / head mods
Cool sounds like Rob is the way to go. Both are actually pretty cheap. Gotta love 2 strokes
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Re: RB vs FRP carb / head mods
I don't know what FRP does to heads. I'm sure it is an improvement, the 220 is pretty de-tuned by design.
I do know the RBD head work was great on my 220. It made a huge difference.
I do know the RBD head work was great on my 220. It made a huge difference.
'08 KTM200xc
'99 CR/KDX Hybrid with that RB stuff done to it
KX100 for the boy
'99 CR/KDX Hybrid with that RB stuff done to it
KX100 for the boy
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Re: RB vs FRP carb / head mods
The FRP head service is milling only, AFAIK. RB mills and reworks the squish band.
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Re: RB vs FRP carb / head mods
Awesome. Really sounds like a 'must-do'. Plus I gotta check if the '04 220r I just bought has the original piston or not....so the head is coming off anyways.
Speaking of which...can I check if the piston is the original or an aftermarket w/o pulling the jug? Any pictures showing stock vs. forged (wiseco) would be helpful
Ian
Speaking of which...can I check if the piston is the original or an aftermarket w/o pulling the jug? Any pictures showing stock vs. forged (wiseco) would be helpful
Ian
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Re: RB vs FRP carb / head mods
You'll have to search around on here. I know I've seen such pictures of the piston tops.
'08 KTM200xc
'99 CR/KDX Hybrid with that RB stuff done to it
KX100 for the boy
'99 CR/KDX Hybrid with that RB stuff done to it
KX100 for the boy
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Re: RB vs FRP carb / head mods
You can take the expansion chamber (exhaust) off, and shine a flash light in the end and have a look at the piston. You may be able to see enough to tell if it's oem or aftermarket that way, and if you can't, well you would have had to take the exhaust off anyway.iswenson wrote:Awesome. Really sounds like a 'must-do'. Plus I gotta check if the '04 220r I just bought has the original piston or not....so the head is coming off anyways.
Speaking of which...can I check if the piston is the original or an aftermarket w/o pulling the jug? Any pictures showing stock vs. forged (wiseco) would be helpful
Ian
Short of that, you do need to take the jug off. Don't take the top cylinder head off or you have to replace the head gasket. So leave the head on, disconnect all coolant lines, top engine mounts, exhaust, carby etc... undo the 4 jug bolts and pop it off.
07' CR450X (Main Bike)
07' KX125 (Completed basket case rebuild, for sale)
88' KDX200 (Not sure yet, runs but with rattly top end)
91' CBR250RR
Old Bikes: 97' KDX200, 00' RM125, 85' XR350, 94' KDX200, 02' CR80, 82' XT250, 98' CT200
07' KX125 (Completed basket case rebuild, for sale)
88' KDX200 (Not sure yet, runs but with rattly top end)
91' CBR250RR
Old Bikes: 97' KDX200, 00' RM125, 85' XR350, 94' KDX200, 02' CR80, 82' XT250, 98' CT200
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RB vs FRP carb / head mods
You might try using a mirror and light to look at the piston top through the spark plug hole. Typically Wiseco pistons will have a multi-letter/number marking on the top of the piston dome, while the Kawi piston will only have a letter.
If there's not too much carbon on the piston dome, you might be able to see the markings without having to take anything more apart.
Good luck.
If there's not too much carbon on the piston dome, you might be able to see the markings without having to take anything more apart.
Good luck.
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RB vs FRP carb / head mods
thanks guys. I was planning on taking the head off anyways to do the RB head mod, so I was thinking about NOT taking the jug off if I knew it was a wiseco.
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RB vs FRP carb / head mods
I thought there was some marking on top of the piston as well as under?
02 KX 200 hybrid: RB head and carb
Sold ☹ DRZ 400 SM
bike build: http://www.kdxrider.net/forums/viewtopi ... ike+stable
bike profile http://www.kdxrider.net/forums/viewtopi ... 0709#30709
newb info: http://www.kdxrider.net/forums/viewtopi ... 57#p117919
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Sold ☹ DRZ 400 SM
bike build: http://www.kdxrider.net/forums/viewtopi ... ike+stable
bike profile http://www.kdxrider.net/forums/viewtopi ... 0709#30709
newb info: http://www.kdxrider.net/forums/viewtopi ... 57#p117919
jetting guide: http://www.kdxrider.net/forums/viewtopi ... 105&t=1156
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Re: RB vs FRP carb / head mods
I just put a Wiseco in my 220 and interestingly while it had the "dot matrix" number etchings on the crown, the "W" on the bottom that I had seen in several pictures on here was not there. So if the piston top is carboned up you may not see the numbers on it and if you are looking for the W on the bottom you might not see that either. The one main identifier that I have seen in pictures to identify the stock piston looks to be the "cross hatch" pattern stamped on both sides by the piston pin.
On another note, anyone else ever use acetone to remove carbon off the head and piston? I had a can laying around and I figured "why not" and tried using it to get the carbon off. Pretty much cleaned it off almost (but not quite) instantly. Did I invent something new or am I late to the party? I never tried it before, I was impressed. Or did I just kill my bike somehow???
On another note, anyone else ever use acetone to remove carbon off the head and piston? I had a can laying around and I figured "why not" and tried using it to get the carbon off. Pretty much cleaned it off almost (but not quite) instantly. Did I invent something new or am I late to the party? I never tried it before, I was impressed. Or did I just kill my bike somehow???
2003 KDX200: Bone stock
2003 KDX 220:
Boyesen reeds
Gnarly Gold Series pipe
Turbine Core 2 silencer
Fat Bars
Super Sport IMS pegs
Cycra Probend hand guards
Tusk dualsport light kit
LED headlamp
Boyesen Factory Racing mag cover
Airbox snorkel removed
Wiesco piston and rings
2003 KDX 220:
Boyesen reeds
Gnarly Gold Series pipe
Turbine Core 2 silencer
Fat Bars
Super Sport IMS pegs
Cycra Probend hand guards
Tusk dualsport light kit
LED headlamp
Boyesen Factory Racing mag cover
Airbox snorkel removed
Wiesco piston and rings