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05-21-2024, 08:55 AM | #1 |
Join Date: Mar 2024
Location: Dothan, Al
Posts: 19
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I just ordered the ebay camshaft and silent roller rockers kit. I bought one with an "upgraded camshaft." It should be in by the end of this month. I plan on documenting the process here with pictures showing the difference between the new and old cams. I will probably do some port cleanup and possibly adjust my squish clearance if there is enough valve to piston clearance. I should gain some power and efficiency there. I'm going to steer clear of any changes to port geometry and just do a 60 grit finish on the intake side and blend any sharp edges I find including the combustion chamber. Oh and if anyone has any torque specs they would like to share or possibly point me to a reliable source that would be awesome! Hopefully this will help someone else decide if they want to try to bend a valve in their engine. I hope the stock springs hold out.
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06-02-2024, 11:04 AM | #3 |
Join Date: Mar 2024
Location: Dothan, Al
Posts: 19
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I installed the cam yesterday. I still have to reinstall the motor and tune the carb. I decided not to remove the base gasket or take the middle layer out of the head gasket to adjust the squish band. It's at about .050" and I'm sure I could have but I want to play it safe for now. Reasons being the piston is already at 0 deck hight and the cam is soooooo much bigger than the old one. I also want to see what the cam will do on its own. The valves seem to clear fine when i rolled the motor over. I should have used some modeling clay and measured the clearance between the piston and valves but it was 11pm at this point and I already sprayed the gasket with copper spray. I didn't have torque specs so I just annealed the copper washers and torqued the bolts to 30ft/lbs. Im pretty sure it was hammered on with an impact from the factory because i had to use a cheater pipe to break the head loose. I set my valves to 0.006" on intake and exhaust. That has been working pretty good for this motor. Maybe next year I will tear it back down and start porting and adjust the squish. I built a flow bench so I can experiment and test results. I will probably do some more research and buy a spare cylinder head before going down that road. I did take the machinist ridge off from around the outside of the valve seats and blended it in to combustion chamber. I previously port matched the intake when I did the nibbi pwk 30 carb swap. I had to cut the flange off the intake and weld on a piece of pipe to adapt the carb and gut the original air box. I would honestly love to put the original air box back on later somehow. I hate pod filters because they are exposed to the rain. That and the adjustable cdi box alone did wonders for this bike. Anyway Im a bit off topic. I can't wait until I get it all tuned up and see what the cam will do.
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06-02-2024, 06:15 PM | #4 |
Join Date: Mar 2024
Location: Dothan, Al
Posts: 19
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Well...It feels like I did a motor swap. Got it reinstalled and did a minor idle adjustment. I hit 80mph! It pulls harder through the whole rpm range. It's still a 223cc bike so dont expect a powerhouse but it is a totally different machine. It is so effortless to ride now and it feels like a bigger motor. A 6 speed would honestly be overkill if that says anything. Money well spent so far but time will tell on reliability.
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06-02-2024, 07:54 PM | #5 | |
Join Date: Aug 2013
Location: Goodyear, Arizona
Posts: 410
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Quote:
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2020 Tao TBR7 9.3:1 PnP head CRF230F exhaust 4 degree advance key 290 degree cam Nibbi PE30 and cone filter Front fork brace |
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06-02-2024, 10:39 PM | #6 |
Join Date: Mar 2024
Location: Dothan, Al
Posts: 19
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The mods would probably be easier too. You could play with different gasket thicknesses or shave the head and not have to correct cam timing like in an ohc. One of these days I want to get a tbr7. I like the way they look and the seat looks comfortable.
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06-03-2024, 02:48 PM | #7 |
Join Date: Aug 2013
Location: Goodyear, Arizona
Posts: 410
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I took .040" off the head already, that's a good cheap mod
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2020 Tao TBR7 9.3:1 PnP head CRF230F exhaust 4 degree advance key 290 degree cam Nibbi PE30 and cone filter Front fork brace |
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06-02-2024, 09:43 PM | #8 | |
Join Date: Jan 2007
Location: Northern Vermont, USA
Posts: 1,247
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Quote:
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First Chinabike: 2006 Roketa RSX200E Current Chinabikes: 2023 Titan DLX & 2022 Lifan KP Mini w/ 210cc BRT kit, 22 RWHP! |
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06-02-2024, 10:08 PM | #9 | |
Join Date: Mar 2024
Location: Dothan, Al
Posts: 19
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