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Author Topic: CB715 go fast tricks?  (Read 1664 times)

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Offline carguy5387

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CB715 go fast tricks?
« on: January 21, 2011, 04:14:42 PM »
So I just picked up a CB175 from a friend for free. Just as I got started on my 750 build. I have decided the 175 is now priority. Does anyone out there know of any ways to hot rod these engines to make a bit more power? Carb swap from a diferent model?  cam? anything would help!
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Offline mlinder

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Re: CB715 go fast tricks?
« Reply #1 on: January 21, 2011, 04:17:24 PM »
They are raced frequently.

Mike has done at least one 160/175 head (they are different, but similar.)

You can ask over at caferacer.net

There's a few over there that race them. Look for jbranson over there. He's quite friendly.
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Offline mlinder

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Re: CB715 go fast tricks?
« Reply #2 on: January 21, 2011, 04:19:15 PM »
Also, I will be moving this thread to 'other bikes' this evening.
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Offline MRieck

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Re: CB715 go fast tricks?
« Reply #3 on: January 21, 2011, 05:34:49 PM »
 Our results were great too!
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Offline Sam Green Racing

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Re: CB715 go fast tricks?
« Reply #4 on: January 22, 2011, 01:44:45 AM »
Quote from: MRieck on January 21, 2011, 05:34:49 PM
Our results were great too!

What's great about turning a load of crap into a race winner..............

























Everything. :D :D :D :D

Carguy, I had the pleasure of being at Mikes when he had this motor, In the hands of Gene the owner who I also met, it really did win first time out. 8) 8) 8)
Have a word with mike.

Sam. ;)
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Offline Terry in Australia

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Re: CB715 go fast tricks?
« Reply #5 on: January 22, 2011, 05:02:28 AM »
Drop it down a mineshaft mate, it'll never go any faster than that!  ;)
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Offline carguy5387

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Re: CB715 go fast tricks?
« Reply #6 on: January 22, 2011, 07:41:44 AM »
thanks guys. its a bit harder to find stuff for this bike...
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Offline gene03079

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Re: CB715 go fast tricks?
« Reply #7 on: January 22, 2011, 01:34:38 PM »
Carguy

Send the motor over to Mike. The 175 race motor he built for me last year had tons of power. I wailed that poor motor all season in every race. It ran up front all year without a problem.

You need the valves done with Kibble White over size. The carbs change to Keihin PE24 with some slick manifolds. Custom pistons and possibly a trick cam set up. You will be making power.

I have been gridded as a second wave behind Honda 350's. I can out run all but the fastest stock 350's on the track. Not bad for a motor that's half the size.

Gene

Look for me to even faster this year.

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Offline carguy5387

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Re: CB715 go fast tricks?
« Reply #8 on: January 25, 2011, 08:01:31 PM »
okay, but what if I'm not building a race bike? I don't want to spend a whole bunch of money on it. what about swapping carbs from another model?

Also I'm trying to find a scrambler style exhaust for it. Does anyone know where I could find a good aftermarket set?
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Offline mlinder

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Re: CB715 go fast tricks?
« Reply #9 on: January 26, 2011, 10:00:46 AM »
Quote from: carguy5387 on January 25, 2011, 08:01:31 PM
okay, but what if I'm not building a race bike? I don't want to spend a whole bunch of money on it. what about swapping carbs from another model?

Also I'm trying to find a scrambler style exhaust for it. Does anyone know where I could find a good aftermarket set?

Since it's the head that's restrictive, the port design not so hot, low compression (9:1) combustion chamber, and rather mild cam profile that make it 'slow', all you'd end up doing is reducing low end power by slapping some larger carbs on it.

Dunno of anyone making aftermarket scrambler pipes for it, but I seem to remember Paulages having some orginals. PM him, see what he wants for em.
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Offline malcolmgb

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Re: CB715 go fast tricks?
« Reply #10 on: February 15, 2011, 02:09:37 PM »
There are 2 styles of engine vertical and sloper, you need the pipes to match. The pipes can be got, the mufflers are absolute crap and corrode. I am looking for a right pipe with muffler at present for my 1973 CL175.
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