10-13-2024, 05:54 PM | #16 | |
Join Date: Jan 2018
Location: NC
Posts: 236
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Quote:
As far as power rating/performance specs are concerned, my understanding is that a stock PR250 engine with a 2 valve head delivers @ 19 HP to the back wheel. The reason the numbers may be varying so much in the sources you’re looking at could be because there are not only 2 and 4 valve versions of the 250 version of this engine, but also 2 and 4 valve versions of the PR300. I have the PR300 with a 2 valve head, and I’m probably making @ 24HP. I could get the 4 valve head and push it to 27HP, but I really like the fuel economy the way it is right now and I don’t really need that extra power. |
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10-14-2024, 04:45 AM | #17 |
Join Date: Jun 2023
Location: Big Piney, WY
Posts: 613
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Tell me more about this PR300. Is it air cooled? Where do I get one? Have you swapped a PR300 into a carb'ed Hawk?
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2023 Hawk 250 from XPRO off of Amazon MOUNTAIN MAN RC + MOTO on YouTube "If there were more bloody noses, there would be less wars." - Hagbard Celine John 2:15 So He made a whip out of cords and drove all from the temple area, both sheep and cattle; He scattered the coins of the money changers and overturned their tables. |
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10-17-2024, 10:42 AM | #18 | |
Join Date: Jan 2018
Location: NC
Posts: 236
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Quote:
You can either order a PR300 from China via Alibaba, or do what I did, and order a big bore kit from Aliexpress (the 300cc kit) for the PR250 engine, and order the engine itself from XPro's eBay site. Then install the PR300/big bore kit into the PR250. The counterbalanced, 6 speed PR250 & the PR300 share the same bottom end; i.e., other than the 25cc in difference, they are the same engine. The PR250 engine goes in and out of stock quite frequently on XPro's eBay site, so you may want to set up a notification to let you know when it's in stock if it isn't right now. The engine is air-cooled, but many put an oil cooler on it. I always wanted to get something with a 6th gear and a little more oomph, but with this engine now, I'm totally satisfied. It's still easy to work on, has about 12-13 more wheel HP than a stock, carbed Hawk, and parts are readily available. See my video below for an overview: Last edited by Dusman; 10-18-2024 at 11:16 AM. |
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