Yamaha Discussions about Yamaha ATVs.

OCTANE QUESTION

Thread Tools
 
Search this Thread
 
  #11  
Old 09-13-2001, 11:18 AM
raptor720's Avatar
Pro Rider
Join Date: Aug 2001
Posts: 778
Likes: 0
Received 0 Likes on 0 Posts
Default

I hate to say it but the head is where the DS650 and EX400 have an advantage. The 5 valve head does allow for greater air speeds which make more torque but the chamber must then suffer from poor design angles. The 5 valve also makes it virtually impossible to formulate a dual cam set up.

You are right on the chamber -- it requires a substantial amount of rework as does the intake ports and pockets. It is very technical work as a slight over port will ruin the head.
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
EIF
Chinese Quads
1
04-20-2017 07:15 PM
shimanok2
Buying an ATV
94
01-29-2016 07:37 PM
Ahtatu
General Chat
9
09-28-2015 12:14 PM
2many2ride
Honda
7
09-27-2015 04:35 AM
Quadzilla Heritage
Classifieds, Garage Sale & Swap Shop
0
09-25-2015 01:39 PM

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 


Quick Reply: OCTANE QUESTION



All times are GMT -5. The time now is 09:47 PM.