Forums
New posts
Search forums
What's new
New posts
New profile posts
Latest activity
Members
Registered members
Current visitors
New profile posts
Search profile posts
Donations
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
General Minitrail Talk
Projects/Builds
First time adding displacement.
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
Message
<blockquote data-quote="69ST" data-source="post: 97889" data-attributes="member: 5"><p>You're taking what began as a 49cc motor out to 110cc+. It's amazing that there's enough fin area to handle 88c, in the first place. Beyond that level, consider an oil cooler & dipstick thermometer mandatory. If you decide to go along the lines of fatcaaat's build, then 11,000rpm should be easy enough...making the billet clutch cheap insurance. You did say you wanted reliability. An all-new TB clutch, billet basket, oil cooler kit & dipstick thermometer total ~$350, not dirt cheap but about as inexpensive as reliable pieces get. </p><p></p><p>If you retain the stock 6v head and use a relatively mild cam, like the SL/"fast road" profile, the motor may be incapable of 11K, thus eliminating the need for a billet clutch basket. That'll cost you some peak hp and top end, but torque will be relatively unaffected. Without a doubt, the stock muffler becomes a restriction beyond about 7hp/50mph.</p><p></p><p>This would be easier to address if your goals were clear. If "...<em>the oil cooler and exhaust are the breaking point.</em>..", then you've pretty well limited this project to 88cc. However, you've not mentioned an mph target (sustained & top speed) or budget number(s).</p></blockquote><p></p>
[QUOTE="69ST, post: 97889, member: 5"] You're taking what began as a 49cc motor out to 110cc+. It's amazing that there's enough fin area to handle 88c, in the first place. Beyond that level, consider an oil cooler & dipstick thermometer mandatory. If you decide to go along the lines of fatcaaat's build, then 11,000rpm should be easy enough...making the billet clutch cheap insurance. You did say you wanted reliability. An all-new TB clutch, billet basket, oil cooler kit & dipstick thermometer total ~$350, not dirt cheap but about as inexpensive as reliable pieces get. If you retain the stock 6v head and use a relatively mild cam, like the SL/"fast road" profile, the motor may be incapable of 11K, thus eliminating the need for a billet clutch basket. That'll cost you some peak hp and top end, but torque will be relatively unaffected. Without a doubt, the stock muffler becomes a restriction beyond about 7hp/50mph. This would be easier to address if your goals were clear. If "...[I]the oil cooler and exhaust are the breaking point.[/I]..", then you've pretty well limited this project to 88cc. However, you've not mentioned an mph target (sustained & top speed) or budget number(s). [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
General Minitrail Talk
Projects/Builds
First time adding displacement.
Top