Any x7 big bore heads? - Pocket Bike Forum - Mini Bikes
 
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post #1 of 16 (permalink) Old 07-05-2016 Thread Starter
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Any x7 big bore heads?

Trying to mod my engine a bit and I think a 70cc big bore would give it some serious power. Any links?
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post #2 of 16 (permalink) Old 07-05-2016
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Re: Any x7 big bore heads?

I think EPR recently got a stihl 60cc head and cylinder with that fit a reed port engine which should fit a piston port. And RCfish put a moped head on a reed port engine which is about 60+cc. Just need to find a cylinder that fits you cases and a piston that fits the crank.

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post #3 of 16 (permalink) Old 07-06-2016
Re: Any x7 big bore heads?

Yes, it has a 52mm bore & piston, compared to a 49cc 44mm bore. I tried the P/P cases but the cyld ports would be sideways and you could no mount a coil over the flywheel and the exhaust port would point to the starter housing.
On the new cag cases its fits better but the 60cc chopsaw has a longer stroke than the 32mm Cag stroke. Its going to be a lot of work, the hole for the Cyld in the cases is 50mm the piston is 52mm, and it goes into the cases. The bottom of the cyld has no skirt, but have to bore the case hole to 53 to 54mm so the piston can clear. Then I have to screw an alum piece 1/4" thick by 1" round to the top of the piston to fill in space to get a decent compression ratio. Also I have four M6 alum Bling screws for body work, go to cut the heads off & thread them in the OEM M6 threaded case holes w/ red tread sealer, make them flush and re-drill new holes to match the 52mm cyld.
Then there is the intake and exhaust ports that are totally weird, have to make the stuff fit some how, lol. But that's the Fun of it, creating something crazy, lol.

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post #4 of 16 (permalink) Old 07-06-2016 Thread Starter
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Found a kit that goes to 53cc. I can port that and install a snake pipe, reed valve, and a massive carbie. All for under $150. Not bad. Going on a bicycle btw.
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post #5 of 16 (permalink) Old 07-06-2016
Re: Any x7 big bore heads?

There is no 53cc pocket bike piston port engine, don't believe everything you see, 96% of the sellers lie like a Rug. MPR claimed my 47cc Cag with maybe 3 horses had 5 1/2 hp, it's a bare face lie. Or, they say there Cag will go 45MPH w/ some mods, yeah, if you spend $1,000 or more dollars on a $169 bike. If it has a 44mm bore its a 49cc engine, I do not care what they did to the cyld. The reed ports and three cyld upper port channels and call it up to 54cc, its the some old 44mm bore. If you have a 44mm bore cyld already, there is no bigger, unless you can make a Stihl cyld fit and piston your cases.
The word B/B big bore kit came form the early 47cc, really 39cc Cags., 40mm bore and 40mm piston w/ 10mm pin. Then they came out with B/B kit a 44mm cyld & 44mm piston with a 10mm rod pin and bearing to fit the stock crank. The factory 49cc Cags w/ 44mm bore & 44mm piston that has a 12mm pin and a HD 12mm crank.

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post #6 of 16 (permalink) Old 07-06-2016 Thread Starter
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Yeah, I need to take mine off to measure and see if it's a 40 or a 44. How hard is it to switch from a 47cc to a 49cc? Can I use the same crank? Also, any crank mods? I heard of a turbo crank mod but it seems bs.
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post #7 of 16 (permalink) Old 07-06-2016 Thread Starter
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Can you refer me to a reed valve and carburetor? Here's mine
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File Type: jpg 20160706_215916_1467857270317.jpg (229.0 KB, 8 views)
File Type: jpg 20160706_215922_1467857311521.jpg (226.4 KB, 7 views)
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post #8 of 16 (permalink) Old 07-07-2016
Re: Any x7 big bore heads?

Most of the Walbro carbs from 11mm to 19mm and beyond have a 31mm bolt spacing. A 19mm Walbro HDA223B has the same 31mm. The bore thru the intake manifold can be enlarged. I just got 2 alum X7 15mm intakes and bored one to 15.88mm to match the 16mm Walbro WT 603, put a brass barbed boost bottle fitting on top, & I put it on my scooter engine. You can bore that plastic one .88mm ( .038" bigger ) and mount a 16mm carb.
If you can grind, drill, sand and Dremel, at davesmotors in Utah you can get a 16mm GSR40 billet alum intake manifold for $16, and a few mods will mount to your cylinder, part# av760. The best 16mm for the piston port engine is, a WT-813 w/ accell pump, #av522 or 19mm HDA223B purge carb, there is a billet manifold for it too.
Attached Images
File Type: jpg Red Head PP and Cag 3rd Bearing1.jpg (316.9 KB, 6 views)
File Type: jpg Red Head PP and Cag 3rd Bearing2.jpg (305.8 KB, 7 views)
File Type: jpg Red Head PP Engine4.jpg (375.7 KB, 7 views)

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Last edited by EPR; 07-07-2016 at 11:23 AM.
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post #9 of 16 (permalink) Old 02-27-2019
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The biggest ya gonna get is the cateye head which is a 44m piston 49cc because a stock x7 is actually a 47cc unless its been changed before u bought it which means its 43mm for piston on the inside of pistons is a number the original x7 49cc is a 43f which is very very hard to find but the fs509 bigger not by much but is enough to absolutely shove out so you can just use ya everyday cag piston arrow pointing in the exhaust direction and put the cateye head but now the exhaust manifold isn't going to line up so what u do is get thin nuts put it behind holes on head put ya screw s through exhaust holes through exhaust manifold line it up get it through to nut screw until its got hold so exhaust is still loose do second hole pit engine back in frame exhaust still loose mount then tighten exhaust as tight as you can get it best to use ratchet n sockets because the holes on the exhaust and its manifold are going to be bigger but the cateye head are ya common size screw so make sure ya use washers bro tighten even use Tarzan grip on ya engine screws I swear by it sounds dodge but ****es over loctite by far hope this is some help sorry for the essay I'm a slow writer on fines lol goodluck mate you fly when you've done that
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Re: Any x7 big bore heads?

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Originally Posted by Chris Jones View Post
The biggest ya gonna get is the cateye head which is a 44m piston 49cc because a stock x7 is actually a 47cc unless its been changed before u bought it which means its 43mm for piston on the inside of pistons is a number the original x7 49cc is a 43f which is very very hard to find but the fs509 bigger not by much but is enough to absolutely shove out so you can just use ya everyday cag piston arrow pointing in the exhaust direction and put the cateye head but now the exhaust manifold isn't going to line up so what u do is get thin nuts put it behind holes on head put ya screw s through exhaust holes through exhaust manifold line it up get it through to nut screw until its got hold so exhaust is still loose do second hole pit engine back in frame exhaust still loose mount then tighten exhaust as tight as you can get it best to use ratchet n sockets because the holes on the exhaust and its manifold are going to be bigger but the cateye head are ya common size screw so make sure ya use washers bro tighten even use Tarzan grip on ya engine screws I swear by it sounds dodge but ****es over loctite by far hope this is some help sorry for the essay I'm a slow writer on fines lol goodluck mate you fly when you've done that
Cateyes and X7's both come stock with a 44mm bore x 34mm stroke which is 49cc....

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Last edited by CAM2; 02-27-2019 at 03:01 PM.
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Depends what maker mine is a arrvi ment to b one of the better makers I took my head and piston in to a pocket rocket shop here in Perth the fellas there rekon that my head is a better quality one and that they've never seen a 43f before they sussed it out n yer mine is stock all its got done to it is air filter and tuned carby but all I know man is since I put the cateye head and 44mm piston bro it ****in insane dude like just when I think I'm Maxin out its like a lil bit more extra fuel squirts through n it kinda feels like a sort of power band in a sense ****in. Awesome lolz I clock between 70 and 80 km/h I'll take photos of my head and piston that was on there n put em up for ya to suss like the intake manifold has 4 screw holes instead of two and the exhaust screws are the really fat hex heads n I've worked on heaps of cunts bikes mainly x7 style 49cc and I've never come across another head or piston that size its beyond me have u got x7 what maker is your one dude
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Re: Any x7 big bore heads?

PPC sold me a 49cc engine, piston port, that only has a 42.7mm piston, so they lied. A lot of these sellers make up stuff, or even lie. Don't believe everything you read like the 54cc Cag B/B kit, its a big lie. The big bore kits were made for the first 47cc engines with a 40mm bore. The they were 44mm bore and had a 10mm rod bearing pin. the later 49ccs have a 44mm cyld and piston with 12mm pin to fit the heavier 49cc crankshaft. Look at my red head alloy head piston port engine above in the post.

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whats funny is the 40mm setup cranked out more RPMs and was faster then the 44mm setup stock

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Last edited by MrKitty; 03-02-2019 at 12:23 PM.
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Re: Any x7 big bore heads?

Quote:
Originally Posted by Chris Jones View Post
Depends what maker mine is a arrvi ment to b one of the better makers I took my head and piston in to a pocket rocket shop here in Perth the fellas there rekon that my head is a better quality one and that they've never seen a 43f before they sussed it out n yer mine is stock all its got done to it is air filter and tuned carby but all I know man is since I put the cateye head and 44mm piston bro it ****in insane dude like just when I think I'm Maxin out its like a lil bit more extra fuel squirts through n it kinda feels like a sort of power band in a sense ****in. Awesome lolz I clock between 70 and 80 km/h I'll take photos of my head and piston that was on there n put em up for ya to suss like the intake manifold has 4 screw holes instead of two and the exhaust screws are the really fat hex heads n I've worked on heaps of cunts bikes mainly x7 style 49cc and I've never come across another head or piston that size its beyond me have u got x7 what maker is your one dude
They stopped making the 2 stroke FS-509 in 2006...The 4 screw intake manifold engine came out around 2009-2010...….

Chances are the engine on your cateye is a replacement engine..

As far as cateyes...Ive had my fair share of them..All had the 2 screw aluminum intake manifold..

They all had the grey fancover shroud too....

Years back my local autoparts store was selling them..A whole bunch of people got hurt riding them on the streets so the County put a ban on sales...They were in the a/p store taking up valuable space so I offered a ridiculously low price for the lot and promised they would all be dismantled and sold as parts only on ebay…I more than tripled my money..LOL





This homebuilt r/c buggy has a 44mm 49cc 2004 Cateye engine..wickedly modified of-course..
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File Type: jpg 021-1.JPG (267.2 KB, 5 views)
File Type: jpg 002-2.JPG (222.5 KB, 5 views)

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Last edited by CAM2; 03-02-2019 at 01:02 PM.
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Re: Any x7 big bore heads?

Here are some mod photos from an old member here.
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File Type: jpg Ported Piston Port Cyld 1.jpg (30.5 KB, 4 views)
File Type: jpg Ported Piston Port Cyld 2.jpg (30.7 KB, 4 views)
File Type: jpg Ported Piston Port Cyld 4.jpg (40.3 KB, 5 views)
File Type: jpg Ported Piston Port Cyld 5.jpg (46.1 KB, 4 views)
File Type: jpg Ported Piston Port Cyld 6.jpg (42.3 KB, 4 views)

Empty Pockets Racing: The difficult we do, the impossible takes longer.....
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