Starting/Running Help!

04srtred
Scoot Member

Posts: 21

Starting/Running Help! Apr 13, 2012 20:54:08 GMT -5

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Post by 04srtred on Apr 13, 2012 20:54:08 GMT -5

Hello,

Im new here to the forum and im working on a Velocity Scooter 150cc. It is a friend of mine's scooter. He said it would not start. He bought it second hand and you can tell it has had one heck of a rough life. Its been laid down several times with everything busted almost. The PO has put a toggle switch on it to get it started.

I started my inspection on it. Found the neck/intake tube running to the motor to have a nice big crack in it. The vent tube was missing, and the coil was bad, rpm isnt working. I took the carb off and since i had it off decided to rebuild it. Rebuilt the carb fixed the intake neck and installed a new coil. It would start up and run after you tinkered with it for about 10 mins. I tried testing the electric choke but i cant tell if its working or not. (this thing is so pieced together its not funny). Well after getting everything back to together and getting it running last night this morning it would not start. He tried for 30 mins to get it running and couldn't.

He brought it back to me this afternoon and after getting it running it would shoot a little blue smoke out the vent tube. I tried to adjust the A/F screw and the idle adjustment a little but it would just not stay running. We would have to hold it to about half to 3/4 throttle for around 15 to 30 seconds in order to get it running.

Im out of ideas at this point. Any help would be greatly appreciated because this is the only mode of transportation he has besides his mom, and friends...

Thanks in advance

Chris

Deleted Deleted Member Posts: 0	Starting/Running Help! Apr 13, 2012 21:12:16 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Deleted on Apr 13, 2012 21:12:16 GMT -5 i suggest a compression test because it might be a dead horse.

04srtred Scoot Member Posts: 21	Starting/Running Help! Apr 14, 2012 6:12:11 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by 04srtred on Apr 14, 2012 6:12:11 GMT -5 What should compression be on one of these motors? I had read anywhere from 100 to 125?? Is this right?

90GTVert Administrator Posts: 41,300 Location: Preston, MD	Starting/Running Help! Apr 14, 2012 8:21:05 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by 90GTVert on Apr 14, 2012 8:21:05 GMT -5 100psi is closer to the minimum compression I'd expect to see in a running engine. I'd hope to see something more like 125-175psi.
	Brent Life is better at high RPM.

04srtred
Scoot Member

Posts: 21

Starting/Running Help! Apr 14, 2012 14:32:51 GMT -5

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Post by 04srtred on Apr 14, 2012 14:32:51 GMT -5

OUCH!!! Just done a compression test. cold it was at 55 warm it was close to 67. The valves have never been adjusted on this scooter. What would you guys suggest as the next step? Adjust valves see if it helps?? Head gasket?? What would be the best process of elimination?

90GTVert Administrator Posts: 41,300 Location: Preston, MD	Starting/Running Help! Apr 14, 2012 14:35:02 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by 90GTVert on Apr 14, 2012 14:35:02 GMT -5 You can adjust the valves and see if it changes, but unless they're insanely tight it's not going to change enough. I'd say try the valves and then move on to disassembly of the top end and inspection.
	Last Edit: Apr 14, 2012 14:35:56 GMT -5 by 90GTVert Brent Life is better at high RPM.

04srtred Scoot Member Posts: 21	Starting/Running Help! Apr 14, 2012 14:49:17 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by 04srtred on Apr 14, 2012 14:49:17 GMT -5 Ok i shot a little 2 cycle oil in the cyclinder and the compression did NOT go up. I know from working on lawnmowers and tillers that it rules out the rings.

04srtred Scoot Member Posts: 21	Starting/Running Help! Apr 14, 2012 14:50:10 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by 04srtred on Apr 14, 2012 14:50:10 GMT -5 What should the clearance be on the valves? Its a Velocity 150cc

04srtred Scoot Member Posts: 21	Starting/Running Help! Apr 14, 2012 14:59:19 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by 04srtred on Apr 14, 2012 14:59:19 GMT -5 Last question. Where does the rpm gauge go on the motor so i can tell what rpm its running at?

Deleted
Deleted Member

Posts: 0

Starting/Running Help! Apr 14, 2012 15:26:42 GMT -5

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Post by Deleted on Apr 14, 2012 15:26:42 GMT -5

Apr 14, 2012 14:32:51 GMT -5 04srtred said:

OUCH!!! Just done a compression test. cold it was at 55 warm it was close to 67. The valves have never been adjusted on this scooter. What would you guys suggest as the next step? Adjust valves see if it helps?? Head gasket?? What would be the best process of elimination?

an entire top end job or part it out IMO.

Deleted Deleted Member Posts: 0	Starting/Running Help! Apr 14, 2012 15:28:16 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by Deleted on Apr 14, 2012 15:28:16 GMT -5 what kind of tach are you using? some run off the neg side of the coil...some wrap around the plug wire. but why? if its got low compression whats the use? time to take it apart.

04srtred Scoot Member Posts: 21	Starting/Running Help! Apr 14, 2012 17:59:12 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by 04srtred on Apr 14, 2012 17:59:12 GMT -5 Where could i find a kit for it? Topend i mean. Im new to the scooter end and have no idea where to order anything

04srtred Scoot Member Posts: 21	Starting/Running Help! Apr 14, 2012 18:00:15 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by 04srtred on Apr 14, 2012 18:00:15 GMT -5 Also last off.. how do i tell what motor i have in this thing.. where would the stamping be?

90GTVert Administrator Posts: 41,300 Location: Preston, MD	Starting/Running Help! Apr 14, 2012 18:06:24 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by 90GTVert on Apr 14, 2012 18:06:24 GMT -5 Check the banners on the forum for a few places that carry GY6 parts. Here's some info that may help with the engine code... 49ccscoot.proboards.com/index.cgi?board=gentech&action=display&thread=2359
	Brent Life is better at high RPM.

04srtred
Scoot Member

Posts: 21

Starting/Running Help! Apr 14, 2012 18:33:55 GMT -5

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Post by 04srtred on Apr 14, 2012 18:33:55 GMT -5

Ok i just checked the valves for shits and giggles.. I cannot fit ANY of my gauges in there. The smallest my gauge goes is .0015 and i cant even get the tip under the rocker arm end on the exhaust or the intake! The cam it at TDC and i can tell someone has been in there. Everything has gooped red silicone. What should the valves be set at?