TRX 300 FW, Piston Kit - Honda ATV Forum
Honda FourTrax Discussions for the FourTrax Rincon, Foreman, Rancher, Recon

 
LinkBack Thread Tools Display Modes
post #1 of 9 (permalink) Old 03-30-2010, 08:12 PM Thread Starter
Member
 
jakedog's Avatar
 
Join Date: Mar 2010
Posts: 76
Liked: 1 times
TRX 300 FW, Piston Kit

The compression in my '91 is a little low and it seems to be lacking power. I was thinking about taking it apart this winter and putting in a piston kit. Would I be better off having the cylinder bored over and buying an oversized piston and rings from Honda or going with a higher compression piston? I see that Wiseco offers a piston that increases the compression from the stock 9:1 to 10.25:1. Would I see a performance boost by making this change? Would the higher compression ratio cause extra wear on other parts?
jakedog is offline  
Sponsored Links
Advertisement
 
post #2 of 9 (permalink) Old 03-30-2010, 08:27 PM
Super Moderator
Supporting Member
 
Helmut's Avatar
 
Join Date: Oct 2009
Posts: 23,581
Liked: 24 times
Being that it's a '91 model, I would go 0.025 over on the cylinder, piston, and rings, because it probably has a lot of wear in the cylinder. Boring a cylinder isn't really going to give you any noticeable power increase. That just cleans up any scratches or wear in the cylinder walls.

Personally, I would stay away from any high compression pistons for the utility ATVs, because the closer to stock that you keep them, the more dependable they are. If you're not worried about dependability and are after more performance, then you might consider it. But without other mods, I don't know if it would give you much more in performance or not.

I believe the low compression ratio is what causes those engines to last so long.

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
Helmut is offline  
post #3 of 9 (permalink) Old 03-30-2010, 08:33 PM
Senior Member
 
Billy250X's Avatar
 
Join Date: Nov 2009
Location: Imler PA
Posts: 2,735
The higher compression with 93 octane fuel will give you a better throttle response but nothing else.

Billy

1991 Trx250X Custom exhaust,K&N jetted,widened 7.5 inches in the back and 8 inches in the frontWarrior rear shock and z400 front shocks with custom brackets.Race cut fenders.+3 swingarm.Way more to come.
Building things makes me happy.
Billy250X is offline  
Sponsored Links
Advertisement
 
post #4 of 9 (permalink) Old 03-31-2010, 07:08 AM Thread Starter
Member
 
jakedog's Avatar
 
Join Date: Mar 2010
Posts: 76
Liked: 1 times
Should I just buy the parts directly from Honda or from an aftermarket supplier. If not Honda, which company should I buy from?
jakedog is offline  
post #5 of 9 (permalink) Old 03-31-2010, 12:31 PM
Junior Member
 
jevans0171's Avatar
 
Join Date: Feb 2010
Location: Shelby County KY
Posts: 25
I would recommend a Wiseco piston kit. Everyone I know speaks highly of them. I would imagine that buying direct from the make of the four wheeler is probably going to be greatly over priced.
jevans0171 is offline  
post #6 of 9 (permalink) Old 03-31-2010, 02:13 PM
Senior Member
 
Billy250X's Avatar
 
Join Date: Nov 2009
Location: Imler PA
Posts: 2,735
Agree^^^^^!!!!!

Billy

1991 Trx250X Custom exhaust,K&N jetted,widened 7.5 inches in the back and 8 inches in the frontWarrior rear shock and z400 front shocks with custom brackets.Race cut fenders.+3 swingarm.Way more to come.
Building things makes me happy.
Billy250X is offline  
post #7 of 9 (permalink) Old 03-31-2010, 02:18 PM
Super Moderator
Supporting Member
 
Helmut's Avatar
 
Join Date: Oct 2009
Posts: 23,581
Liked: 24 times
I agree, also.

Most 4-wheeler problems are caused by a loose nut connecting the handlebars and the seat!!

You only need two tools in life -- WD-40 and duct tape. If it doesn't move and should, use the WD-40. If it shouldn't move and does, use the duct tape.
Helmut is offline  
post #8 of 9 (permalink) Old 03-31-2010, 02:57 PM Thread Starter
Member
 
jakedog's Avatar
 
Join Date: Mar 2010
Posts: 76
Liked: 1 times
I checked the Wiseco website. All of the pistons they offer have a compression ratio of 10.25:1, compared to the stock 9:1 ratio. Per my previous post, could a higher compression ratio damage other engine components or reduce the longevity of the engine?
jakedog is offline  
post #9 of 9 (permalink) Old 03-31-2010, 04:01 PM Thread Starter
Member
 
jakedog's Avatar
 
Join Date: Mar 2010
Posts: 76
Liked: 1 times
I found at shop called G & H Discount ATV Supply (out of TN) on ebay that will clean, bead blast, bore and hone my cylinder and send it back with an oversized piston, ring kit, piston pin, circlips, and top end gasket kit for around $200 with shipping. I contacted them and they stated the new piston will retain stock compression (9:1). Sounds like a good deal, anyone every hear of GH or order from them?
jakedog is offline  
Reply

  Lower Navigation
Go Back   Honda ATV Forum > Honda Model Specific Discussions > Honda FourTrax

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Honda ATV Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome