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Old 04-23-2008, 06:43 AM   #1
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Default O.S. V-spec

I have a O.S. V-SPEC with a bad low end bog.

What plug do you run in it?

I can't tune it out, HELP!
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Old 04-23-2008, 06:48 AM   #2
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The OS P3 is the recommended plug for that motor. Make sure your clutch is not causing the problem with too early engagement.
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Old 04-23-2008, 06:53 AM   #3
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is it a "lean bog"? richen the LSN

If it's just a bit slugish down low, try a warmer plug... I like a P6 or P4 in warmer weather... I only use a P3 in really cold weather

A cooler plug will retard ignition timing to allow for more revs, a hotter plug will advance timing for more low-mid punch.

Hope this helps
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Old 04-23-2008, 08:11 AM   #4
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The clutch looks o.k. I just put in 1.1 spring trying to help it out.

I'm off to the lhs for a p6, I'm running a p3 now.
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Old 04-23-2008, 08:45 AM   #5
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If its a lean bog, it will make a "wah-wah-wah" sound when you accelerate. Make sure the mid screw is flush and turn LSN needle out to richen the mixture. Also, use the P3 or P4 glowplug. The P4 will favor a bit more top speed. I have no issues with the P3 in hot Florida weather on a Magnesium head OS Speed.
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Old 04-23-2008, 11:15 AM   #6
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P3 FOR ME 2 GALLONS AND STILL ON THE ORIGINAL PLUG
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Old 04-23-2008, 12:07 PM   #7
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Check for a cracked block or air leak.

My V-Specs have by far been the easiest engines I have ever owned to tune.

If it wont start it needs a plug. If it stalls either it ran out of fuel or the clutch bearings have gone bad. These things are incredible when it comes to ease of tuning.

Bought a new Speed ran one tank at home and took it to the track. On the first tank I flipped on the back stretch waited a while no marshall coming walked off the stand across the track picked it up carried it back to the pits threw it back down and went back up on the stand and kept going without flaming out on the 2nd tank. I couldnt believe it. I love these things best engines ever.
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Old 04-23-2008, 05:25 PM   #8
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OD 97T and dont look back!
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Old 04-23-2008, 08:15 PM   #9
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i have the same engine. i only club race. i use p3 plug and 30% nitro. i love the power of this combo.
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Old 04-23-2008, 09:12 PM   #10
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I had the same trouble. I was running the werks fuel. What are you running? The Odonnel helped mine out. Its gone. I'm running the JP3 pipe. What pipe you running.
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Old 04-24-2008, 03:35 AM   #11
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I'm running 30 % byron's gen 2

tried a few things last night again and no help

pulling motor out tonight and checking for any air leaks,cracks in the block, putting in an p6 plug.

The motor runs good but has an low end bog, only when on the ground.

I sounds great on the bench.

keep giving me more idea's
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Old 04-24-2008, 04:17 AM   #12
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have you checked the diffs. umm the clutch mightn't be engadging right.
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Old 04-24-2008, 04:59 AM   #13
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P6 might be a little cold. Check to make sure the head bolts are tight. See if there is a tear in the carb boot as well.

The fuel won't be causing it. Werks fuel or Byrons, they are both two of the best fuels out there, and I've used a few.

As far as pipe goes, I had no luck with a JP2 on that engine. A JP1 worked well for shorter tracks, a JP3 works well for bigger track. Clutch up a bit and the JP4 works very well and you'll get great mileage. An OS 2050 or 2060 will work with this engine, as they were designed for it and/or the Speed's. Another pipe that is supposed to work very well is the new AE 2035 which you used to be able to get as a TTR 2035.
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Old 04-24-2008, 06:58 AM   #14
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Quote:
Check to make sure the head bolts are tight. See if there is a tear in the carb boot as well.
The carb boot?

isn't this just a boot to protect the slide from dirt?
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Old 04-24-2008, 11:54 AM   #15
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Quote:
Originally Posted by fasteddie2 View Post
The carb boot?

isn't this just a boot to protect the slide from dirt?
Its also seals the carb. If its torn, it will suck air, leaning the mixture or making it erratic.
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