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Old 02-29-2024, 06:24 AM   #16
Thumper   Thumper is online now
 
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Join Date: Feb 2021
Location: Kansas City
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Did you order one of those 450s thru Alibaba?

Kamax has a 2 stroke 250 I toyed with ordering. I had problems with AliExpress vendor over a cylinder head and decided that the combination of shipping cost, shipping risk, and potential reimbursement fail was just too much on a crate bike from somewhere in mainland China. AliExpress backs the vendor in a dispute, even with photos. Then removes emails promising shipping credit. It' is Alibaba, but I think it's basically the same thing.
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-2022 5 speed Templar X Orange, OEM 51T rear sprocket, 14T front sprocket
-NOS 2020 KTM 250SX (2-stroke motocross), less than 10 hours on it


 
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Old 03-04-2024, 09:31 PM   #17
BBQKidd   BBQKidd is offline
 
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Quote:
Originally Posted by solidsnake2431 View Post
I have a feeling I might be the only one.. What I did was make the mistake of buying Nibbi PWK 30 Race series carb instead of the PE30 carb that everyone ugrades to. Not knowing the Nibbi PWK is a race carb and a completely different animal. It is MUCH larger both in the outside height of the carb itself but more importantly the diameter of the intake and engine side! The regular upgrade is 30mm engine side and 35 airfilter side.. you can still slide the boots over it..The racing carb is 40mm engine side and 55mm airfilter side!! Yes you read that right it's a MONSTER. So it's IMPOSSIBLE to connect to the boots but fortunately enough the boots on this bike use extra thick boots unlike jap bikes so I was barely able to dremel out the inside of each to accept the oversize carb even then you still have to use a little grease to help stretch.

Anyway I also mated it up with a really nice Bel Parts race series exhaust system that deletes the stock cat converter and also adds a power bomb expansion chamber.

When I got all done I fired her up expecting it to run a little ruff requiring a bit of turning. But it fired up immediately and it actually ran like a MILLION BUCKS! It SREAMS! I don't have much to compair it to other then a Lifan 250 China bike I use to have that was VERY slow and underpowered and review videos I have seen of the new EFI Lifan 6 speed that also seems really slow and underpowered. I also own a new EFI KTM 500 EXC with exhaust and tune. This feels a lot more like a DRZ 400 then it does a 250. Maybe the X Pro is just underrated in power or the mods make a REALLY big
difference idk. But I do think I am the only one. It was extremely difficult to stuff it in there and fit.

I also have a wideband 02 with guage and I am going to put it on very soon and use it to see what AFR I am at and to further tune it to squeeze every drop of power I can.
You can get these intake boots to fit your bigger carb inlet very inexpensively on Temu. FYI.

https://www.temu.com/zsdtrp-35mm-40m...498_c4m9jd99zh


 
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