Pinging/Knocking On Boom 125-10

johncstll17 · 11-09-2020, 11:23 PM

I installed a big bore kit from Tbolt taking the bike to 141cc
but for some reason now i have a loud ticking/pinging/knocking sound.

It does this at idle and through the rpm band, it does not sound like pinging, but it defiantly has a metallic sound to it, Im running 91 octane 20 pilot jet and 105 main jet. Plug is a hair rich.

Looking for ideas and if anyone has experienced this with a big bore kit.

**JerryHawk250** · 11-10-2020, 05:39 AM

Check valve clearance. Sounds like too big of a gap or could be you timing chain is off one tooth when you did the installation.

franque · 11-10-2020, 09:35 AM

I would check to see if you have any mounts that are loose, then I would check the valves. It's unlikely that timing would do that.

johncstll17 · 11-10-2020, 02:08 PM

Valve lash is set to .005 exhaust and .003 intake. I marked the chain before taking apart and put back as it was. if the timing chain was off i would expect valve impact on the piston head, i removed the head to verify that and found no evidence of the piston coming into contact with the valves

11-09-2020, 11:23 PM	#1
johncstll17 Join Date: Nov 2020 Location: Fresno, CA Posts: 2	Pinging/Knocking On Boom 125-10 I installed a big bore kit from Tbolt taking the bike to 141cc but for some reason now i have a loud ticking/pinging/knocking sound. It does this at idle and through the rpm band, it does not sound like pinging, but it defiantly has a metallic sound to it, Im running 91 octane 20 pilot jet and 105 main jet. Plug is a hair rich. Looking for ideas and if anyone has experienced this with a big bore kit.
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11-10-2020, 05:39 AM	#2
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,574	Check valve clearance. Sounds like too big of a gap or could be you timing chain is off one tooth when you did the installation. __________________ 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
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11-10-2020, 02:08 PM	#4
johncstll17 Join Date: Nov 2020 Location: Fresno, CA Posts: 2	Valve lash is set to .005 exhaust and .003 intake. I marked the chain before taking apart and put back as it was. if the timing chain was off i would expect valve impact on the piston head, i removed the head to verify that and found no evidence of the piston coming into contact with the valves Last edited by johncstll17; 11-10-2020 at 06:08 PM.
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11-10-2020, 09:35 AM	#3
franque Join Date: Nov 2017 Location: Marseille, France -> Conakry, Guinea Posts: 1,481	I would check to see if you have any mounts that are loose, then I would check the valves. It's unlikely that timing would do that.
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