700xx Hard to start after Big Bore kit - Club700XX - Honda TRX700XX Forum
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post #1 of 27 Old 08-16-2016, 08:42 PM Thread Starter
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700xx Hard to start after Big Bore kit

Just put a cylinder works big bore kit on the Honda. Now when it's been sitting I usually cranks up fine and easy. After you ride it for a minute tho it seems really hard to start like the battery or the starter doesn't have the power to turn the motor over. The battery is brand new. Any suggestions???
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post #2 of 27 Old 08-17-2016, 04:45 AM
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you may have to set the right side exhaust valve a bit tighter to get the decompressor to work properly .

the book does say .008 and that's fine...... when it was new . try .006

751 ,barker pipe,290 Web cam,+3 stroker,TB bored to 46.8 and moved back from head 1 inch,+3 big bore , +1 intake valves, Hard Welded Rockers,KW springs, ported, clutch mod , air box removed ,Cat oil mod, dynojet commander V w/auto tune , lowered rear end , TRX450R front shocks ,
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post #3 of 27 Old 08-17-2016, 07:39 AM Thread Starter
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If I'm sitting on the bike, the right side exhaust valve would be the front right one correct?
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post #4 of 27 Old 08-17-2016, 12:32 PM
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i fitted the same, plus a stroker crank, and starting is exactly the same as it was before...
i know this is not much help to you but at least you know it should start normally
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post #5 of 27 Old 08-17-2016, 05:09 PM
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what cam are you's using

751 ,barker pipe,290 Web cam,+3 stroker,TB bored to 46.8 and moved back from head 1 inch,+3 big bore , +1 intake valves, Hard Welded Rockers,KW springs, ported, clutch mod , air box removed ,Cat oil mod, dynojet commander V w/auto tune , lowered rear end , TRX450R front shocks ,
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post #6 of 27 Old 08-17-2016, 06:46 PM

 
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I'm thinking a smaller valve lash (may) not let enough oil flow? Might not be a issue with hardened rockers, but idk?

#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, DG 6 Pack Rack, 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 #7 of 27 Old 08-17-2016, 07:40 PM
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oil flow?

751 ,barker pipe,290 Web cam,+3 stroker,TB bored to 46.8 and moved back from head 1 inch,+3 big bore , +1 intake valves, Hard Welded Rockers,KW springs, ported, clutch mod , air box removed ,Cat oil mod, dynojet commander V w/auto tune , lowered rear end , TRX450R front shocks ,
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post #8 of 27 Old 08-17-2016, 08:00 PM

 
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Quote:
Originally Posted by cataway View Post
oil flow?
Yeah you know the stuff that lubricants the internal parts of the motor. Maybe oil flow isn't the correct term, but you need oil in between the rockers and valves.

#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, DG 6 Pack Rack, 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 #9 of 27 Old 08-17-2016, 08:04 PM
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the decompressor on the XX cam only works if the valve lash is set with just enough space to force the right side valve to open .

to much lash ,then the valve is not bumped .
next time you remove the cam look at the decompressor . you will likely see a shiny spot . the more that spots hits ,the more it wears ,the more it wears , then less valve lash is needed to them bump the valve open .

sad that we can not get that part .

751 ,barker pipe,290 Web cam,+3 stroker,TB bored to 46.8 and moved back from head 1 inch,+3 big bore , +1 intake valves, Hard Welded Rockers,KW springs, ported, clutch mod , air box removed ,Cat oil mod, dynojet commander V w/auto tune , lowered rear end , TRX450R front shocks ,
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post #10 of 27 Old 08-17-2016, 08:20 PM Thread Starter
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So tighter clearance on the exhaust valve?
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