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Old 12-01-2012, 07:26 PM   #1 (permalink)
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how to adjust valves on 1990 honds fourtrax 300

I just rebuilt a Honda fourtrax 300 and it has no power and I know its the valves so.I was wondering the tolerences and how to get it top dead center. Thanks
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Old 12-01-2012, 09:50 PM   #2 (permalink)
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Quote:
Originally Posted by Prhodes View Post
I just rebuilt a Honda fourtrax 300 and it has no power and I know its the valves so.I was wondering the tolerences and how to get it top dead center. Thanks
Does it have a pull start?
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Old 12-01-2012, 09:59 PM   #3 (permalink)
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Remove the timing plug,use the kick starter to slowly turn the engine over to the t timing mark(remove the spark plug makes it so much easier),or go download the free e manual in the schematics,and repair manuals section in here for fast easy referral,and complete directions on how to do anything to your atv... hondaatvforums.net is the password...
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FREE REPAIR MANUALS >>http://www.hondaatvforums.net/forums...all-years.html 1986-1992 trx350 parts for sale>>http://www.hondaatvforums.net/forums/atv-parts-sale/29225-complete-part-out-1986-fourtrax-350-a.html
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Old 12-02-2012, 07:13 AM   #4 (permalink)
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I looked but I can't find one that hasn't been deleted. Can you post a link? Thanks
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Old 12-02-2012, 08:48 AM   #5 (permalink)
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Okay so I put it TDC and the valves are tight so I loosened them a lot but still too tight and I can't get the feelergauge in there for nothing. Help please
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Old 12-02-2012, 08:50 AM   #6 (permalink)
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There is an intake and an exhaust stroke. Both are at TDC. One of the has the valves tight and the other one loose. Rool it to TDC again to change the stroke and see if they loosen up. You want to adjust them when they are on the loose stroke.

EDIT: This is from my manual. It may explain better.

Rotate the crankshaft using the recoil starter knob
to align the ‘‘T’’ mark on the flywheel with the index
mark on the rear crankcase cover.
Make sure the piston is at TDC (Top Dead Center)
on the compression stroke.
This position can be obtained by confirming that
there is slack in the rocker arm. If there is no slack,
rotate the crankshaft one full turn and match up the
‘‘T’’ mark again.

Last edited by antjaw; 12-02-2012 at 08:53 AM.
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Old 12-02-2012, 06:05 PM   #7 (permalink)
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I figured out what it was. It was way out of time
Re timed it and now its running pretty good. Still think the valves are in need of adjusting. Looks like a project for next weekend
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Old 12-02-2012, 06:52 PM   #8 (permalink)
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I'd adjust the valves to exact specs asap BEFORE I rode it,or ran it any more...
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Old 12-02-2012, 08:53 PM   #9 (permalink)
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Trust me I am. I adjusted them before this to .006. But who knows it being out of time it may be way off. Oh and its got a 98 wiring harness and CDI on it. Is that gonna cause it any problems? Just a thought. Thanks
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Old 12-02-2012, 09:22 PM   #10 (permalink)
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Quote:
Originally Posted by Prhodes View Post
Trust me I am. I adjusted them before this to .006. But who knows it being out of time it may be way off. Oh and its got a 98 wiring harness and CDI on it. Is that gonna cause it any problems? Just a thought. Thanks
It shouldn't be an issue if the entire harness was used,and connected properly...You said that you tried to adjust the valves when the timing was not on tdc on the compression stroke which tells me that they need adjusting again,or you may mess a valve up,or cause a lean condition which can burn the cylinder,and piston up rather quickly...
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Last edited by Deeperinthabush; 12-03-2012 at 01:40 AM.
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