Forums
New posts
Search forums
What's new
New posts
New media
New media comments
Latest activity
Media
New media
New comments
Search media
Members
Registered members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
FJR Motorcycle Forums
Technical & Mechanical Problems
How do you precisely measure engine vacuum?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support Yamaha FJR Motorcycle Forum:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="ELP_JC" data-source="post: 281800" data-attributes="member: 6177"><p>Thanks a lot for your great answers.</p><p></p><p>I don't think we need dead-on accuracy for this purpose, so my vacuum gauge with a not-so-small restrictor should work. Thanks to you I know that the AVERAGE, or middle of the 'bouncing', is where I need to aim at. And some fluctuation seems perfectly normal as well, and it's not a problem averaging it.</p><p></p><p>As far as the placing of the restrictors, that's very interesting, and makes sense as well. I had the 'Deluxe' MotionPro tuner for the longest time, but loaned it and never got it back, so ordered another one. The only mercury one I could find anywhere (the 'economy') was paid over a month ago, and never got it. After disputing the charge, finally got it Thursday.</p><p></p><p>Instructions were vary basic. Pour mercury thru vent hole, cut hose in 4 pieces, insert restrictors 3/4", and insert hoses into tubes. That's it. And those instructions were identical on my previous (old) deluxe model.</p><p></p><p>Anyway, here's what I did: inserted the restrictors (kind of buckets with a hole on top) with the orifice facing towards the engine, and inserted all of them exactly 3/4". Then I inserted that end on the solid tubes on top of the tool until I had about 5mm of hose between the top of each tube and the bottom of the plastic 'bucket', but couldn't get them exactly the same (hard to insert the darn hose), but close. Is this the best way to install the tuner?? And thanks again to all who contributed.</p><p></p><p>JC</p></blockquote><p></p>
[QUOTE="ELP_JC, post: 281800, member: 6177"] Thanks a lot for your great answers. I don't think we need dead-on accuracy for this purpose, so my vacuum gauge with a not-so-small restrictor should work. Thanks to you I know that the AVERAGE, or middle of the 'bouncing', is where I need to aim at. And some fluctuation seems perfectly normal as well, and it's not a problem averaging it. As far as the placing of the restrictors, that's very interesting, and makes sense as well. I had the 'Deluxe' MotionPro tuner for the longest time, but loaned it and never got it back, so ordered another one. The only mercury one I could find anywhere (the 'economy') was paid over a month ago, and never got it. After disputing the charge, finally got it Thursday. Instructions were vary basic. Pour mercury thru vent hole, cut hose in 4 pieces, insert restrictors 3/4", and insert hoses into tubes. That's it. And those instructions were identical on my previous (old) deluxe model. Anyway, here's what I did: inserted the restrictors (kind of buckets with a hole on top) with the orifice facing towards the engine, and inserted all of them exactly 3/4". Then I inserted that end on the solid tubes on top of the tool until I had about 5mm of hose between the top of each tube and the bottom of the plastic 'bucket', but couldn't get them exactly the same (hard to insert the darn hose), but close. Is this the best way to install the tuner?? And thanks again to all who contributed. JC [/QUOTE]
Insert quotes…
Verification
Post reply
FJR Motorcycle Forums
Technical & Mechanical Problems
How do you precisely measure engine vacuum?
Top