07-31-2022, 01:09 AM | #1 |
Join Date: Nov 2021
Posts: 31
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Straight pipe valve adjustment
I straight piped my TBR7 until the new exhaust comes in and I was wondering what I should have the valves clearance set too? Some people say it shouldn’t hurt and some say it will. Please help!!
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07-31-2022, 09:52 AM | #2 |
Join Date: Feb 2021
Location: Kansas City
Posts: 2,731
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If you haven't adjusted the valves, definitely adjust them ASAP. No change needed for pipe change. Exhaust gap 0.005 to 0.007", and intake 0.003 to 0.005" is all good (adjust when the engine is cold).
Edit... These gaps are too wide, should be closer to 0.002/0.003 (intake/exhaust), give or take 0.001" Some run these on the narrow side. I have erred on the wide side to be sure that the valves seal, but I know too wide can damage the tappet surface in the long run. Last edited by Thumper; 08-01-2022 at 07:58 AM. |
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07-31-2022, 01:44 PM | #3 |
Join Date: Nov 2021
Posts: 31
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I had just them every 500 miles I just wanted to know if I need to do anything different with a straight pipe
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07-31-2022, 09:34 PM | #4 |
Join Date: Dec 2020
Location: Dayton Pa.
Posts: 953
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Why a straight plpe they are so cheap,would sell you mine for cheap. TOO loud for no more power just removed cat from stock plpe, And very happy , loud and no lmprovement
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08-01-2022, 12:45 AM | #5 |
Join Date: Jan 2022
Location: Gatesville Texas
Posts: 161
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exhaust type doesn't matter.set both about 005 a little loose is better than tight.
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08-01-2022, 05:11 AM | #6 |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,110
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.005 to .007 inches is a lot too big... Were you meaning to say .05 to .07 millimeters instead? I ask because that is the proper sec range to be working in. Technically .05 to .08mm.
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08-01-2022, 07:52 AM | #7 |
Join Date: Feb 2021
Location: Kansas City
Posts: 2,731
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Yes, my valve lash is 2x (or almost 3x) too large. I should bring them down. I have only ~200 miles on the Templar, and wanted to be sure it wasn't too tight during early break in. I guess those are excessively wide gaps. Currently they are at about 0.006" (0.15mm) on both sides. I will tighten up the gaps and change the oil again soon.
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08-01-2022, 10:30 AM | #8 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,110
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Quote:
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08-01-2022, 03:44 PM | #9 |
Join Date: May 2021
Posts: 357
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That’s a good question. Also does it matter if you ride in cool country versus hot? Or does water cooled engines versus air cooled make a difference on one’s choice of valve clearance? Thinking out loud….
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08-01-2022, 05:17 PM | #10 |
Join Date: Feb 2021
Location: Kansas City
Posts: 2,731
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ZS172-FMM-3A 249cc (Templar X):
This is an OHC engine, not pushrod. I set both at about 0.006" It gets hot (this blazing Summer), so I wanted to make sure the valves would close. Excessive, maybe, but I do NOT hear valve tappet noise from this head. I can probably close them up somewhat. High performance recommendations (Henner) are TIGHT (0.002"), but until I have at least 1000 miles on the engine, valves can "seat". And as I said, I don't hear valve noise from the head. Once I observe stable clearance, I will drop the spec accordingly. Keep in mind I am still under 250 miles on the bike! The TBR7 and Storm are both pushrod CG clone (ZS167-FMM 229cc). My son's TBR7 is getting more miles now. I will begin to close the gap on these as well. Neither of them make much valve noise, and it isn't like any of these bikes are operating under rpm conditions that could cause them to float I am more concerned about making sure there is good oil in them and that they are not overheating. All three of them are running great! Power level is close to best possible without head mods, and they start instantly. |
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08-01-2022, 07:19 PM | #11 | |
Join Date: Nov 2021
Posts: 31
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Quote:
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08-02-2022, 03:29 PM | #12 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,110
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Quote:
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08-02-2022, 05:43 PM | #13 |
Join Date: Feb 2021
Location: Kansas City
Posts: 2,731
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I was thinking that the rods are long, and since temperature causes a % deformation, any given % change of a long rod is absent from the OHC design. Both have rockers, no difference really there. Maybe the OHC design has less heat deformation (expansion), can be adjusted closer tolerance (0.002" Henner's recommendation on the 172FMM)
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08-02-2022, 07:05 PM | #14 | |
Join Date: Apr 2017
Location: Omaha, NE
Posts: 8,110
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Quote:
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Tags |
help me, tbr7 250, valve adjustment |
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