Start on 705. - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

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  • 1 Post By Steve.k
 
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post #1 of 10 Old 02-07-2020, 08:50 PM Thread Starter
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Start on 705.

Heres what we have on our flow bench so far. We are no where close to klr chris.But noticeable improvement especially in velocity.


Stock .050-53.8, .100-109.4, .150- 154.4, .200-190.5, .250- 222, .300-246.1, .350-262, .400-264. Mod. .050-55.6, .100-108.5, .150-157.9, .200-201.7, .250-238.2, .300-267.5, .350-286.4,.400-294.4. Stocl port velocity @.350 lift 269.6 modified velocity @
350 lift 284.2. So far I can pick up a little more velocity but no flow with filling in. My next move is bigger valves.
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post #2 of 10 Old 02-09-2020, 09:52 AM Thread Starter
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We tried the bigger valve shnitz gave me numbers for. They were ferrea blanks that are 40mm. We cut to 36. Heres result.

New numbers with 39mm valve .060-56.1, .100-109 9, .150-158.1, .200-201.5, .250-238, .300-267.6, .350-281, .400-296.7, .450-300.5, .500-311.2.
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post #3 of 10 Old 02-09-2020, 10:03 AM
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Quote:
Originally Posted by Steve.k View Post
We tried the bigger valve shnitz gave me numbers for. They were ferrea blanks that are 40mm. We cut to 36. Heres result.

New numbers with 39mm valve .060-56.1, .100-109 9, .150-158.1, .200-201.5, .250-238, .300-267.6, .350-281, .400-296.7, .450-300.5, .500-311.2.
Thanks for sharing your data (kudos for using a flow bench and providing quantifiable numbers!).

Some confusion; 40 mm blanks, cut to 36 mm; then tested at 39 mm? Please clarify.

“You better put down that gun. You got two ways to go, put it down or use it. Even if you tie me, you’re gonna be dead.” "John Russell" (Paul Newman), Hombre
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post #4 of 10 Old 02-09-2020, 02:25 PM Thread Starter
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Sorry yes they come blank just over 39. He sets the seat and valve right at 39. The actual seat contacts further in than if on outer edge typically on valves. He has used this trick on race bikes and from the jump in flow you see why. The exh will remain the standard size. Steve
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post #5 of 10 Old 02-09-2020, 05:16 PM
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Quote:
Originally Posted by Steve.k View Post
Heres what we have on our flow bench so far. We are no where close to klr chris.But noticeable improvement especially in velocity.


Stock .050-53.8, .100-109.4, .150- 154.4, .200-190.5, .250- 222, .300-246.1, .350-262, .400-264. Mod. .050-55.6,

.100-108.5, .150-157.9, .200-201.7, .250-238.2, .300-267.5, .350-286.4,.400-294.4.

Stocl port velocity @.350 lift 269.6 modified velocity @
350 lift 284.2. So far I can pick up a little more velocity but no flow with filling in. My next move is bigger valves.
Quote:
Originally Posted by Steve.k View Post
We tried the bigger valve shnitz gave me numbers for. They were ferrea blanks that are 40mm. We cut to 36. Heres result.

New numbers with 39mm valve .060-56.1,

.100-109 9, .150-158.1, .200-201.5, .250-238, .300-267.6, .350-281, .400-296.7,

.450-300.5, .500-311.2.
I really don't see much difference.

pdwestman
Modify at "YOUR OWN RISK"!

Still riding my 1987 KL650-A1. 85,000+ miles & counting
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post #6 of 10 Old 02-09-2020, 05:23 PM Thread Starter
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Not sure what u talking pdwestman. From [email protected] to [email protected] is huge for small head. Especially with increasing velocity. The jump from big valve to small is less but still a increase. Must be a reason Mtech and shnitz both do it.
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post #7 of 10 Old 02-09-2020, 06:10 PM
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Quote:
Originally Posted by Steve.k View Post
Sorry yes they come blank just over 39. He sets the seat and valve right at 39. The actual seat contacts further in than if on outer edge typically on valves. He has used this trick on race bikes and from the jump in flow you see why. The exh will remain the standard size. Steve
Does your statement in post # 2 above, "We cut to 36," mean the valve seat contact area is 36 mm in diameter? Sorry, the significance of the numbers may be obvious to someone skilled in the trade; the numbers, 40, 36, and 39 in your post # 2 confused me.

“You better put down that gun. You got two ways to go, put it down or use it. Even if you tie me, you’re gonna be dead.” "John Russell" (Paul Newman), Hombre

Last edited by Damocles; 02-09-2020 at 06:18 PM.
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post #8 of 10 Old 02-09-2020, 08:01 PM
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I read 294.4 & 296.7 at .400 inches of lift, in those quoted postings. Not 264 @.400 inches. I do read 264cfm at .400 inches of lift for stock ports in first post.

pdwestman
Modify at "YOUR OWN RISK"!

Still riding my 1987 KL650-A1. 85,000+ miles & counting
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post #9 of 10 Old 02-09-2020, 11:10 PM Thread Starter
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I made a mistake in first quote. The factory valve size is 36-37. The aftermarket is just over 39. We cut to 39.
Pdwestman yes we got 296 from 294 wit stock valve. But if you look at upper flow it keeps climbing. Which in porting world is good. Especially if I add bigger cams
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Last edited by Steve.k; 02-09-2020 at 11:44 PM.
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post #10 of 10 Old 02-10-2020, 12:35 PM Thread Starter
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I talked to schnitz racing This morning and they recommend putting the hotcams in to compliment the port work and big bore. He said our flow is typical of what they see. He said the cams do not alter the low end tq but help through the midrange. Makes for a very nice combo he says. Sounds all good to me. Very helpful crew at Schnitz!!
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