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Author Topic: Simple helmet test. China helmet to avoid  (Read 1058 times)

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Online PeWe

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Simple helmet test. China helmet to avoid
« on: March 26, 2015, 04:01:49 AM »
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline evanphi

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Re: Simple helmet test. China helmet to avoid
« Reply #1 on: March 27, 2015, 09:49:39 AM »
WOW. Did not expect such a catastrophic failure. You could certainly tell just by looking at it, though, that the second was a much cheaper helmet.
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--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline Bob Wessner

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Re: Simple helmet test. China helmet to avoid
« Reply #2 on: March 27, 2015, 10:09:32 AM »
Wow is right, just got a headache.  :o
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Offline Duanob

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Re: Simple helmet test. China helmet to avoid
« Reply #3 on: March 27, 2015, 10:30:12 AM »
I think I'm going to throw all my cheaper helmets away today! I have one that is a Vetter /Bell but I am suspect now. Also a THH. Not worth taking the chance after seeing that.
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"Just because you flush a boatload of money down the toilet, doesn't make the toilet worth more",  My Stepfather the Unknown Poet

1974 CB360T
1976 CB550K2 Resurrected
1976 CB550F2 Barn Find
1979 CX500 VG "HONDA-GUZZI"
2007 Moto Guzzi Breva 750ie
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Offline ekpent

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Re: Simple helmet test. China helmet to avoid
« Reply #4 on: March 27, 2015, 10:31:25 AM »
Quote from: Bob Wessner on March 27, 2015, 10:09:32 AM
Wow is right, just got a headache.  :o
I got a little headache also from the kids and dogs in the background, but that test was revealing. What the heck was that crap chinese helmet made out of anyways, some thin cheap plastic ?
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Offline evanphi

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Re: Simple helmet test. China helmet to avoid
« Reply #5 on: March 27, 2015, 11:02:32 AM »
Quote from: ekpent on March 27, 2015, 10:31:25 AM
Quote from: Bob Wessner on March 27, 2015, 10:09:32 AM
Wow is right, just got a headache.  :o
I got a little headache also from the kids and dogs in the background, but that test was revealing. What the heck was that crap chinese helmet made out of anyways, some thin cheap plastic ?

Saran wrap over packing foam.
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--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline flybox1

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Re: Simple helmet test. China helmet to avoid
« Reply #6 on: March 27, 2015, 12:53:14 PM »
it sounded crunchy, so i'm going with ground egg shells in paper mache?  :P
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
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Offline Steve F

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Re: Simple helmet test. China helmet to avoid
« Reply #7 on: March 27, 2015, 07:26:26 PM »
Not much better than those D.O.T. approved Do-Rags I see on a lot of those pirates on the road.
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