Head pipe differences - Club700XX - Honda TRX700XX Forum
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post #1 of 4 Old 01-09-2019, 06:04 AM Thread Starter
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Head pipe differences

I have a 2008 700 with the stock head pipe. I have another stock head pipe that I got with a used parts lot that I bought. I noticed that the flange on the head pipe where it joins the muffler on the pipe that I have on my 700 is substantially smaller than the flange on the head pipe in this parts lot. I looked up the part number for the head pipe for the 3 different 700XX models listed on RMATV and all 3 models show the same part number. Have any of you ever seen this and does it matter? I am going back to a stock muffler that was in the parts lot but I am planning to use my head pipe because it has already been header wrapped and I don't want to do that again if it is not necessary. I am 99% certain that these are both stock head pipes. Both have/had the stock heat shields on them and the stock engine mount flange.

2017 Honda TRX500 Rubicon
2008 Honda TRX700XX
1995 Honda TRX 300EX
2001 Honda TRX 90
1986 Honda TRX 70
1985 ATC 250 SX
2003 Kawasaki KFX50
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post #2 of 4 Old 01-09-2019, 12:48 PM

 
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Smaller flange? Are you talking diameter or lenght?

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#1 2008 Honda Trx700xx HMF Performance Exhaust, PCV, Stroked 710cc, 10.5:1 Wiseco Piston, Frt Elka Stage 4's, Fox Podium X rear's, EHS Lid, L8ton 11/16" sway bar, PRM Desert II Bumper & Front Skids.
#2 2008 Trx700xx AMR Reaper, Ehs Big 3, P/P head, Xcalibur Cam, Hard Welded Rockers, +1 In/Ex Valves, +3 Throttle body, 11:1 CP Piston, Elka Stage 3 Legacy Shocks, L8ton 11/16th Sway Bar, PRM Front Skids, Desert II Bumper & Rear Utility Rack.


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post #3 of 4 Old 01-09-2019, 09:26 PM Thread Starter
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The thing I am referring to a s a flange is basically the bump stop for the stock muffler as it slides onto the head pipe. It cannot go any further than the ring that is around the head pipe where the muffler slides on. The one on the pipe that was on my 700 is about the thickness of a quarter. The ring on these head pipes that I bought is around a 1/4" I need to get some measurements and photos.

2017 Honda TRX500 Rubicon
2008 Honda TRX700XX
1995 Honda TRX 300EX
2001 Honda TRX 90
1986 Honda TRX 70
1985 ATC 250 SX
2003 Kawasaki KFX50
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post #4 of 4 Old 01-10-2019, 05:55 AM Thread Starter
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I took some measurements with calipers and the 2 headers measure the same. I had on my glasses for taking the measurements and as a result I found the issue. The FMF slip on came with a larger exhaust donut and the donut had a large washer on the head pipe side. I was mistaking this washer for the exhaust flange on the header. All 3 head pipes that I have are the same.

2017 Honda TRX500 Rubicon
2008 Honda TRX700XX
1995 Honda TRX 300EX
2001 Honda TRX 90
1986 Honda TRX 70
1985 ATC 250 SX
2003 Kawasaki KFX50
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