CSC TT250 - Spark knock (detonation)???

Sclark1013 · 06-21-2018, 11:13 PM

Being new to enduro's and Chinese bikes, I'm looking for some input. I think I'm hearing spark knock under moderate load, 4,500 RPM + on my new TT250 with 55 miles. I filled up with 91 octane, but it didn't seem to make a difference. Is this characteristic? Also, is it normal to get a little vibration / buzz felt through the seat when in the higher RPM's? I'm following some break-in instructions and don't go over 5,000 to 6,000 RPMs. I can't imagine what the vibration would be like at 8,000 RPM...

One more thing, I hope you're all having as much fun as I am!

Sullybiker · 06-21-2018, 11:45 PM

I thought I was getting some. It's just the noise it makes.

2LZ · 06-22-2018, 10:02 AM

I had the exact same noise on ours when it was brand new. First I thought it was the little air pump. Ended up being the CSC license plate frame cracked and was making noise in rhythm with the motor. When it finally broke off, the noise stopped.

Ours also had a little vibration at certain R's. I loosened and re-torqued all the motor mounts and it stopped. They only take 22-28 pounds torque, depending on the size bolt. "Even" is far more important than super tight.

06-21-2018, 11:13 PM	#1
Sclark1013 Join Date: May 2018 Posts: 41	CSC TT250 - Spark knock (detonation)??? Being new to enduro's and Chinese bikes, I'm looking for some input. I think I'm hearing spark knock under moderate load, 4,500 RPM + on my new TT250 with 55 miles. I filled up with 91 octane, but it didn't seem to make a difference. Is this characteristic? Also, is it normal to get a little vibration / buzz felt through the seat when in the higher RPM's? I'm following some break-in instructions and don't go over 5,000 to 6,000 RPMs. I can't imagine what the vibration would be like at 8,000 RPM... One more thing, I hope you're all having as much fun as I am!
	0

06-22-2018, 10:02 AM	#3
2LZ Join Date: Mar 2010 Location: Volcano, Ca Posts: 7,092	I had the exact same noise on ours when it was brand new. First I thought it was the little air pump. Ended up being the CSC license plate frame cracked and was making noise in rhythm with the motor. When it finally broke off, the noise stopped. Ours also had a little vibration at certain R's. I loosened and re-torqued all the motor mounts and it stopped. They only take 22-28 pounds torque, depending on the size bolt. "Even" is far more important than super tight. __________________ "Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life." 2007 Suzuki DRZ400S (SM convert) 2009 Q Link XP 200 1967 BSA B25 250cc Starfire 2022 Royal Enfield Interceptor 650 2023 Royal Enfield Scram 411 1948 Royal Enfield Model G 350
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06-21-2018, 11:45 PM	#2
Sullybiker Join Date: Dec 2016 Location: Western PA Posts: 363	I thought I was getting some. It's just the noise it makes.
	2