|
|
Post by Jwhood on Jun 7, 2014 22:19:19 GMT -5
So I have an 07 key west tgb and she will run fine for a little while but once she warms up I'll lose power,I will have throttle wide open and she will barely move I don't have the stock carb I got a new carb from partsforscooters.com because factory carb was shot,I'm running the b8 ngk plug and a Mrp racing exhaust with factory airbox with 90verts airbox mod so my stock airbox would fit my new carb,can not figure what the he'll is going on I'm running and 80 m.j in the carb I'm so lost this is my bike for work so I need it too run,I had a repair shop tune it up but that was before I put Mel exhaust on any suggestions would be great!!!!
Sent from.........
|
|
|
|
Post by 90GTVert on Jun 8, 2014 10:02:51 GMT -5
Might need a larger main jet now that you have the pipe. Parts For Scooters also sells main jet kits so you'd have a selection to try. If the jet is too small it will likely be a fairly "clean" sounding bog... smooth... if it's the other way and too rich they usually sputter. |
|
|
|
Post by Jwhood on Jun 8, 2014 12:52:28 GMT -5
Yeah she was going good till she is warmed up ,I'm not sure what size jet came with carb from partsforscooter as they don't say plus it was not numbered and I'm not sure what pilot jet is in there,I just put new head and piston on so I'm pretty sure it's not soft seized.what m.j would/should I use I ordered 85 and 90 and still have same issue once she gets warm,yeah it is a clean smooth no power issue just goes from going at a good speed too barely moving at once she gets warmed up,is that the pilot jet issue or the m.j issue???
Sent from my HTC6600LVW using proboards
|
|
|
|
Post by 90GTVert on Jun 8, 2014 13:25:33 GMT -5
You can soft seize a brand new engine in perfect condition if the tune is wrong. If there's not enough fuel it runs hot and an aluminum piston will expand more quickly than a cast iron bore so it temporarily seizes in the bore. Could be that it's not too far off and the additional fuel from the enrichment circuit that's active when the engine is cold is enough to keep it from happening.
|
|
|
|
Post by Jwhood on Jun 8, 2014 14:37:41 GMT -5
Ok so I went in looked at my m.j sizes I have a 70,75,80,85,which one should I try like I said I have the 80 in there now!!!
Sent from my HTC6600LVW using proboards
|
|
|
|
Post by 90GTVert on Jun 9, 2014 7:30:17 GMT -5
85
|
|
|
|
Post by Jwhood on Jun 9, 2014 15:04:41 GMT -5
Thanks man I'll try today when I get home from work
Sent from my HTC6600LVW using proboards
|
|
|
|
Post by Jwhood on Jun 9, 2014 19:17:21 GMT -5
So I put the 85 in and now she won't even start even with starter fluid,the fuel mixture screw is all the way in on the carb,plus plug is soaking wet and it started once with the 85 in with air filter off and starter fluild but only ran for about a 1 minute and the she conked out now I'm literally pouring in sweat trying too get her too start,this scooter is driving me nuts
Sent from my HTC6600LVW using proboards
|
|
|
|
Post by 90GTVert on Jun 10, 2014 5:38:19 GMT -5
You can try going the other way and go to the 75 to see if it improves. Mix screw all the way in should be all the way rich on that circuit. Make sure the enricher is working. You can look at it when the scooter has been off for a long while, then start the scoot and run it a few minutes. Recheck quickly and it should be longer than before.
|
|
|
|
Post by 2TDave on Jun 10, 2014 6:25:01 GMT -5
Brent where is the line between an a/f mix screw regulating air or fuel. My Delorto19 all the way in would be lean so it's regulating fuel. On the above all the in is rich so it's regulating air. Correct? So how do you know?
|
|
|
|
Post by 90GTVert on Jun 10, 2014 8:05:51 GMT -5
If the mixture screw is nearest the inlet of the carb it regulates air so when you screw it in you're blocking off air and richening the mixture. If the screw is nearest the outlet it regulates fuel and screwing it in blocks off fuel to lean the mixture. Not sure that's the case on every carb, but so far it works with all of the scooter carbs I've messed with.
|
|
|
|
Post by Jwhood on Jun 10, 2014 12:27:56 GMT -5
So I have a screw with spring in middle of carb and one that is flush with carb body near air filter inlet is that the fuel mixture or is the one with spring fuel mixture
Sent from my HTC6600LVW using proboards
|
|
|
|
Post by 90GTVert on Jun 10, 2014 13:00:05 GMT -5
The one in the center should be idle speed. It raises the slide when screwed in (same effect as pulling the throttle open a little). The other should be mixture.
|
|
|
|
Post by Jwhood on Jun 10, 2014 16:55:41 GMT -5
So I got her started and once she got warm she started sputtering and loses power with the 85 m.j in and no matter what I did I could not get the idle to change
Even had air mixture screw all the way out and idle screw all the way in and vice versa no luck any other suggestions??
Sent from my HTC6600LVW using proboards
|
|
|
|
Post by 90GTVert on Jun 10, 2014 17:22:04 GMT -5
My MRP exhaust tends to make the engine dead off the pipe, but runs strong once it hits. This is why I was wondering about springs fading. If the RPM drops from springs getting weaker once hot, it could stay out of the pipe's sweet spot and never hit so it feels weak all of the time. If the pipe isn't in the right range you won't be able to tune the main jet. Knowing your RPM would be helpful or if you are able to post a vid to photobucket or youtube and share it here we may be able to tell. I'm just not exactly sure what the issue is at this point. It can be tricky in person, but it's really tough online.
For now I'd say go back to the 80 or try the 75 main jet and see what happens since the 85 is worse.
So I'm clear, it was tuned and ran fine and then the only thing that changed since then is the exhaust and it runs bad now... or has more changed since it was tuned by a shop?
|
|
