High Compression Issue - Club700XX - Honda TRX700XX Forum
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post #1 of 8 Old 10-25-2012, 12:59 PM Thread Starter
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High Compression Issue

My first post ever on one of these things......don't cut me up too bad....

Here is my understanding of the High compression on startup. My bike is showing 130-150 PSI durning my compression test. after much troubleshooting this tells me I have a bad Auto Decompression lobe on my cam. With that said this tells me that the only problem i am going to have is a rough time starting my bike and keeping it running (I live in NC ride mostly in WV) under super cold conditions, and i have no worries there.

Tell me if i am wrong but i think i am going to let that ride until i have to perform some type of major head work then i will replace it, because after everyhting i found this will not hurt the bike.

I posted this because there is very little i could find on this issues, so i spoke to my neighbor who is an Audi/VW mechanic and he mentioned having a manual decompressor for a kick start 4 stroke dirt bike......with that information the above is what i deduced.....let me know if i am wrong.....PS thinking about going with Kibbelwhite valve and spring kit for a winter project.....any thoughts thanks in advance for not chewing me up too bad if this info is bad.....
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post #2 of 8 Old 10-25-2012, 04:51 PM
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skk700xx,
Sorry I can't help you with this specific problem but just wanted to let you know that this forum is here to help you. Never feel that you are going to be berated for any question you might have. I guarantee someone with the knowledge concerning your question will help you.
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post #3 of 8 Old 10-25-2012, 07:26 PM
 
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What is the reason for the question, Is it hard for the motor to turn over? The XX has a crappy battery from the factory that doesn't always perform as needed. If its just hard starts time to time I'd invest in a CBR1000r battery.

The decompression mechanism wouldn't have anything to do with it running under super cold condition either.

The Kibblewhite valves and springs would be a nice addition but wouldn't give you any performance gains. Is there any reasoning for changing them?

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post #4 of 8 Old 10-25-2012, 08:56 PM
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What exactly is the problem you are having?

I had removed the decompressioner all together in my Honda 400ex as it went bad and was making noise, Also on the HotCams for the 400ex the decompressioner is not used. I am sure this is the same for the 700xx but I have not had mine long enough to really have any problems with it yet.

As for the Kibbelwhite valves & springs, I have them in my Yamaha Warrior 350 and they work well for me.

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post #5 of 8 Old 10-26-2012, 08:42 AM
 
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decomp is a offset weight that only activates during slow rpm on intial first couple revolutions after that the centrifical force should hold it open and lower the pin inside the cam that will push the rocker open to release comp. if one was sticking then thats an issue but it loses comp. if its not opening it will make it start hard but have no effect anywhere else. the pin can wear a groove in the rocker and be the fault for it not opeing so it may not be the decomp but the rocker face. also like said the batts in the xx are fairly weak so a upgrade there is a good idea

kibble valves on the xx have worked pretty well i dont use them in much else but the small yami engines like the warrior but them and the xx have a mamoth valve stem size so i havent been worried to much about a failure there


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post #6 of 8 Old 10-26-2012, 09:50 AM
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My seems to have a hard time turning over also until its warmed up. Once it fires up and idles for a few seconds it has no problem. I think my battery is crap though. I did the entire topend rebuild and have not road it in months and battery wasn't on a tender. It's fully charged now so this post got me curious to go home and see if the beast fires up.
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post #7 of 8 Old 10-26-2012, 05:09 PM
 
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I have found the valves need checking alot ,when they get outta spec ,hard starting and it doesn't seem to idle smoothly. Last time I checked mine it was 100psi.

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post #8 of 8 Old 10-26-2012, 10:31 PM
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grin

Quote:
Originally Posted by Baxter View Post
I have found the valves need checking alot ,when they get outta spec ,hard starting and it doesn't seem to idle smoothly. Last time I checked mine it was 100psi.
i came to the same conclusion about the valves you are exactly right . i had the same prob when valves are out of spec it does what bax said. mine had the same prob when my valves needed to be adjusted!


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