Motorized Bicycle Engine Kit Forum  


Go Back   Motorized Bicycle Engine Kit Forum > Motorized Bicycle Welcome Forum > Introduce Yourself

Introduce Yourself Meet & greet your fellow motorized bicyclists, make introductions and even find others in your area.

Thread Tools Display Modes
Old 07-11-2011, 11:20 AM
226340 226340 is offline
Motorized Bicycle Newbie
Join Date: Jul 2011
Location: oregon
Posts: 2
Default Hi my name is..

Hello all my name is Tony. Just wanted to say I am new to mb, and am eager to ride my first build, but already have had a rough start, got about 2 miles out before my Grubee skyhawk just died, I have checked for spark and there is none... Do these CDI's actually go bad that fast. Has this happened to anyone? Please help.
Reply With Quote
Old 07-11-2011, 11:29 AM
harlyhermansson's Avatar
harlyhermansson harlyhermansson is offline
Motorized Bicycle Elite Member
Join Date: Nov 2010
Location: sweden
Posts: 102
Default Re: Hi my name is..

welcome to the speed freaks natural habitat tony have no experience of that engine but i wold check the kill switch, spark plug electron distance and spark plug.
if you dare give full throttle, it's not fast enught
Reply With Quote
Old 07-11-2011, 12:13 PM
Ernst's Avatar
Ernst Ernst is offline
Motorized Bicycle Elite Member
Join Date: May 2011
Location: Turlock Ca
Posts: 363
Default Re: Hi my name is..

Yep Tony I too had an experience like that.

The CDI can be bad or the magneto but it's best to start simple and dismiss things step by step.

The things I know about from friends and now experience are not a complete set of possible causes but they are a few to consider.

Spark plug cap from the CDI broke and the replacement broke for me. Check that.
CDI could have a poor connection or came unplugged,
The magneto wiring could have broke (six hole is supposed to be lower quality)
The head *jug) could be loose and you have lost compression.
The "kill switch" could be bad so unplug from the wiring by the engine and check.

Like I say I am new and learning but those are things I know of so far.. Well that and check that you are not out of gas.

Reply With Quote
Old 07-11-2011, 12:16 PM
2door's Avatar
2door 2door is offline
Super Moderator
Join Date: Sep 2008
Location: Littleton, Colorado
Posts: 16,222
Default Re: Hi my name is..

Welcome to the forum. Sorry you're having troubles but you've found the right place to come for help.
Take a close look at your wiring connections from the CDI/engine. If you're using the kit supplied plug in connectors we always suggest getting rid of them and make those connections soldered and protected with heat shrink tubing.
Many have experienced problems with the kill switch. You can try eliminating it from the circuit to rule out a switch malfunction.
Check the high voltage lead (spark plug wire) connections at both ends. The kit supplied plug boot is not the best way to go. There's too much chance of a poor connection at the plug. Also where the plug wire screws into the CDI.
Post back in the 'Trouble Shooting' section if these suggestions don't pan out for you.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"
Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

All times are GMT -5. The time now is 10:46 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2016, vBulletin Solutions, Inc.