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Author Topic: Boyesen Rad Valve Porting.  (Read 905 times)

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Boyesen Rad Valve Porting.
« on: March 18, 2013, 01:27:20 pm »
I took my Rad valve off for better flow. Went back to stock cage with Boyesen replacement reeds on it. I dont think it runs any better now then it did,I think it ran better before. But i have started porting the rad valve out to give it more flow and volume. But here is a couple pic of what ive done so far.
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91 Lt250r Bartlett port and head mod v force 2 Hinson Clutch Basket Cool Head Scp Pipe and silencer ,KN air filter ,EBC clutch, Ohlins  Triple rate Shocks Redone by PEP Shocks,Stock Rear Shock Redone By Pep Shock,  DG nerf Bars , Lonestar axle 2+2,Lonestar Swingarm ,Douglas Red Label rims.

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Re: Boyesen Rad Valve Porting.
« Reply #1 on: March 19, 2013, 05:15:59 am »
You can see how much i took off the right side of it. I finished it up last night. Will get another pic after i polish it. But it is bigger now then the stock boot and about the same volume as the stock cage. So should have a great deal more flow then it did. I know everyone say V force 2 is the way to go, But i had a set on my Nephew Blaster, it ran alright. But when i put the stock cage in with Boyesen replacement reeds.That Blaster ran so much better with the boyesen then the V Force 2 .
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91 Lt250r Bartlett port and head mod v force 2 Hinson Clutch Basket Cool Head Scp Pipe and silencer ,KN air filter ,EBC clutch, Ohlins  Triple rate Shocks Redone by PEP Shocks,Stock Rear Shock Redone By Pep Shock,  DG nerf Bars , Lonestar axle 2+2,Lonestar Swingarm ,Douglas Red Label rims.

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Re: Boyesen Rad Valve Porting.
« Reply #2 on: March 19, 2013, 06:17:50 am »
i have do the same on my boyesen rad , i like it because it bolt right to my 38mm carburetor,
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Re: Boyesen Rad Valve Porting.
« Reply #3 on: March 19, 2013, 06:39:30 am »
I did one a while back for ratterrier, hes been happy with it. I have been going to do another and do some testing to see of it hurts top end. For a low and mid tuned machine I think there good. Just don't have the ree tip area to flowat higher rpms.
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Re: Boyesen Rad Valve Porting.
« Reply #4 on: March 19, 2013, 07:04:13 am »
carl do you need one to test with, i think i have 1 or 2 of them here.
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Re: Boyesen Rad Valve Porting.
« Reply #5 on: March 19, 2013, 12:49:18 pm »
Yea was thinking about open the reed tip up some. atleast make it wider to left and the right sided of the cage. I got it under cut under on the sides  lips. Probably  come make the hole 1/4 inch bigger on both side atleast make them square. For a better high end flow.
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91 Lt250r Bartlett port and head mod v force 2 Hinson Clutch Basket Cool Head Scp Pipe and silencer ,KN air filter ,EBC clutch, Ohlins  Triple rate Shocks Redone by PEP Shocks,Stock Rear Shock Redone By Pep Shock,  DG nerf Bars , Lonestar axle 2+2,Lonestar Swingarm ,Douglas Red Label rims.

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Re: Boyesen Rad Valve Porting.
« Reply #6 on: March 19, 2013, 06:33:10 pm »
Here is a couple more pic after both side are ported. A few of the pics are were i widen out the ports. to make more flow. Then the last pic shows it against a stock boot.
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91 Lt250r Bartlett port and head mod v force 2 Hinson Clutch Basket Cool Head Scp Pipe and silencer ,KN air filter ,EBC clutch, Ohlins  Triple rate Shocks Redone by PEP Shocks,Stock Rear Shock Redone By Pep Shock,  DG nerf Bars , Lonestar axle 2+2,Lonestar Swingarm ,Douglas Red Label rims.

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Re: Boyesen Rad Valve Porting.
« Reply #7 on: March 22, 2013, 11:58:40 am »
Quote from: Iceracer on March 19, 2013, 06:39:30 am
I did one a while back for ratterrier, hes been happy with it. I have been going to do another and do some testing to see of it hurts top end. For a low and mid tuned machine I think there good. Just don't have the ree tip area to flowat higher rpms.

I'm pretty 'HAPPY HAPPY HAPPY' with it. I dont have a V Force cage to compare it to. I went from stock porting, pro circuit pipe, 39PWK and a stock Rad Valve to Barlett Porting, Shearer Pipe, 39PWK and a ported rad Valve and she rips now!! Before it was a GREAT trail quad with all the low n mid I had but I got my tail kicked on the drag strip by everyone....even a couple over weight 440ex thumpers.....the sand dunes call for a screamin setup on a 250 and thats what I have now and I love it!! My buddies with the 400s, 440s and piped 450s.....they dont like it so much tho.  =)
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1992 LT250R - Just a fat chrome pipe   ;)
1991 LT250R - Under a grill cover on the patio
1990 Hybrid - Needs a pip/silencer, kicker, chain....

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Re: Boyesen Rad Valve Porting.
« Reply #8 on: March 22, 2013, 01:40:54 pm »
I havent put it back on yet but it looks good.It ran good with the scp before.But it was weak on the top end. So hopefully this fixes it.
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91 Lt250r Bartlett port and head mod v force 2 Hinson Clutch Basket Cool Head Scp Pipe and silencer ,KN air filter ,EBC clutch, Ohlins  Triple rate Shocks Redone by PEP Shocks,Stock Rear Shock Redone By Pep Shock,  DG nerf Bars , Lonestar axle 2+2,Lonestar Swingarm ,Douglas Red Label rims.

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Re: Boyesen Rad Valve Porting.
« Reply #9 on: March 22, 2013, 07:17:34 pm »
Well i put my stock cage on with 927 castor.It has smoked like heck. Well bought some new pilots jets was going to re jet it. Well i got the Rad valve done and put it back on.Now its not smoking as bad at all, also running alot crisper. Guess their is a big difference in the carbon reeds over the replacement boyesen. Can't wait to run it some tomorrow,
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91 Lt250r Bartlett port and head mod v force 2 Hinson Clutch Basket Cool Head Scp Pipe and silencer ,KN air filter ,EBC clutch, Ohlins  Triple rate Shocks Redone by PEP Shocks,Stock Rear Shock Redone By Pep Shock,  DG nerf Bars , Lonestar axle 2+2,Lonestar Swingarm ,Douglas Red Label rims.

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Re: Boyesen Rad Valve Porting.
« Reply #10 on: March 24, 2013, 02:41:47 am »
I made the reed ports bigger and the reed it self i trimed out as big as my port hole.I didnt get a picture.I took one but the camera messed up and didnt get to load, Now their in my bike.Well it made a big difference on top end. Today was the first time i open it up after the rebuild. Needs some tuning but was a big difference over all.I would recommend who ever has one port it makes a big difference atleast on the butt dyno test.
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91 Lt250r Bartlett port and head mod v force 2 Hinson Clutch Basket Cool Head Scp Pipe and silencer ,KN air filter ,EBC clutch, Ohlins  Triple rate Shocks Redone by PEP Shocks,Stock Rear Shock Redone By Pep Shock,  DG nerf Bars , Lonestar axle 2+2,Lonestar Swingarm ,Douglas Red Label rims.
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