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Post by oliver on Jun 5, 2024 10:52:13 GMT -5
Hey guys, I just acquired a pretty cool 2002 gp1 with a wc piaggio hiper2. I know they have an intake restrictor plate, but do they have any exhaust restrictions? It does have an expansion chamber type exhaust from the factory and a dummy pipe, but does it have a catalytic inside or anything that needs to be removed? It is an imported model with EPA labels on the exhaust and chassis. So not gray market. Thanks!
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Post by Lucass2T on Jun 6, 2024 3:37:37 GMT -5
Pretty sure the factory exhaust has a cat. My 1994 Yamaha axis had one so a 7y older Euro bike had one from the factory for sure.
They are restricted in the head pipe and in the variator. And the plate under the intake like you mentioned.
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Post by aeroxbud on Jun 6, 2024 4:37:35 GMT -5
Most Piaggio motors also came with a rev limiter as well. It's only limited to 10,000rpm. But it's something to be aware of.
The cat is probably just a pipe off the exhaust going to a canister. Nothing to worry about. Just junk it if you change the exhaust.
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Post by oliver on Jun 6, 2024 10:27:17 GMT -5
Pretty sure the factory exhaust has a cat. My 1994 Yamaha axis had one so a 7y older Euro bike had one from the factory for sure. They are restricted in the head pipe and in the variator. And the plate under the intake like you mentioned. Thanks for the reply, is it worth cutting the factory exhaust apart to remove the restrictions? It looks like it is a good design from the factory. The variator limiter may have been removed as it has a malossi kevlar belt installed from the previous owner. I'll have to pull the cover and check. |
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Post by oliver on Jun 6, 2024 10:28:25 GMT -5
Most Piaggio motors also came with a rev limiter as well. It's only limited to 10,000rpm. But it's something to be aware of. The cat is probably just a pipe off the exhaust going to a canister. Nothing to worry about. Just junk it if you change the exhaust. Limited with the cdi? How would I know if it is or isn't? No, the pipe is a dummy pipe that's about 8 inches long off the head pipe that goes no where. |
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Post by aeroxbud on Jun 6, 2024 14:42:50 GMT -5
You would need a tachometer to really know. For sports level tuning I wouldn't worry about it.
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Post by Lucass2T on Jun 7, 2024 0:34:39 GMT -5
Pretty sure the factory exhaust has a cat. My 1994 Yamaha axis had one so a 7y older Euro bike had one from the factory for sure. They are restricted in the head pipe and in the variator. And the plate under the intake like you mentioned. Thanks for the reply, is it worth cutting the factory exhaust apart to remove the restrictions? It looks like it is a good design from the factory. The variator limiter may have been removed as it has a malossi kevlar belt installed from the previous owner. I'll have to pull the cover and check. No just leave the OEM pipe. There are very good and affordable stock replacement pipes available. They come without a cat and if you derestrict those they will give more power than the OEM ever can. |
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Post by oliver on Jun 7, 2024 1:59:36 GMT -5
Thanks for the reply, is it worth cutting the factory exhaust apart to remove the restrictions? It looks like it is a good design from the factory. The variator limiter may have been removed as it has a malossi kevlar belt installed from the previous owner. I'll have to pull the cover and check. No just leave the OEM pipe. There are very good and affordable stock replacement pipes available. They come without a cat and if you derestrict those they will give more power than the OEM ever can. Will do. The scooter came with a ton of malossi parts in abox including a mhr rep kit, 25mm phbl malossi carb kit, multivar 2000, hit clutch, a racing crank, tons of gaskets and seals. The scooter is stock besides a kevlar belt and a Doppler rear air shock. I'll have to figure out what's a good exhaust to pair with a mhr replica. I wanted to have some fun with the stock engine and do some mods in steps vs. just throwing everything at it. |
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Post by aeroxbud on Jun 7, 2024 5:55:14 GMT -5
The MHR replica kit is a great powerful cylinder. It's about as much as you can do, but still ride it every day.
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Post by oliver on Jun 7, 2024 11:18:51 GMT -5
The MHR replica kit is a great powerful cylinder. It's about as much as you can do, but still ride it every day. What exhaust do you recommend? |
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Post by aeroxbud on Jun 7, 2024 14:53:51 GMT -5
A Yasuni R would be a good match with a wide power band. But if you want maximum performance something like a Yasuni C16.
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Post by Lucass2T on Jun 8, 2024 1:16:53 GMT -5
Like Aeroxbud said, the yasuni R is the single best pipe you can buy for a very fast street setup. With the yasuni R you have plenty of torque down low which makes it very useful and easy to ride for slow speed riding, but it also has the top end for high speed stretches. The R allows for the use of a centre stand where other pipes don't. The R has been made of thick gauge steel and a silencer with a sturdy body and is easily servicable (o-rings, gaskets and dampening wool).
You could go with a Yasuni C16 but they rev out farther and therefore are a dog down low. You really have to rev it up high to get going which can get annoying when you are in traffic or just try to keep noise a bit down. They don't allow for a center stand either. Excellent pipe for high power setups though.
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Post by oliver on Jun 11, 2024 21:27:28 GMT -5
Like Aeroxbud said, the yasuni R is the single best pipe you can buy for a very fast street setup. With the yasuni R you have plenty of torque down low which makes it very useful and easy to ride for slow speed riding, but it also has the top end for high speed stretches. The R allows for the use of a centre stand where other pipes don't. The R has been made of thick gauge steel and a silencer with a sturdy body and is easily servicable (o-rings, gaskets and dampening wool). You could go with a Yasuni C16 but they rev out farther and therefore are a dog down low. You really have to rev it up high to get going which can get annoying when you are in traffic or just try to keep noise a bit down. They don't allow for a center stand either. Excellent pipe for high power setups though. Thanks for the advice! I decided on the yasuni c10. Hoping it allows for the center stand. |
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Post by aeroxbud on Jun 12, 2024 3:27:10 GMT -5
I suppose being right in between the R, and C16. It should work really well.
Don't forget to remove the two restrictions.
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Post by oliver on Jun 12, 2024 9:34:04 GMT -5
I suppose being right in between the R, and C16. It should work really well. Don't forget to remove the two restrictions. I thought all the 'c' exhausts don't have the restrictions. I will check when it comes in. It's a newer exhaust so I don't find a ton of info out there. Next I have to decide if I just rejet my 17.5mm delortto or put the 25mm phbl malossi kit the scooter came with.... I think the mhr rep will work with either. |
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