D15 Marvel vs Zenith

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   Anyone have an opinion about the carburetor for the D15 ?I have 2 D15s and having great difficulties with one of them.
Are the Zenith carbs any good? 
Thanks for your input !
Steve

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DrByte Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 13 Jun 2021 Location: Wisconsin Points: 17	Post Options Post Reply Quote DrByte Report Post Thanks(0) Quote Reply Topic: D15 Marvel vs Zenith Posted: 15 Jun 2021 at 10:37am
	Anyone have an opinion about the carburetor for the D15 ? I have 2 D15s and having great difficulties with one of them. Are the Zenith carbs any good? Thanks for your input ! Steve

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DrAllis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Points: 21723	Post Options Post Reply Quote DrAllis Report Post Thanks(1) Quote Reply Posted: 15 Jun 2021 at 12:15pm
	Series 1 and 2 D-15's only had MarvelSchebler carbs. Zenith reliability over Marvel?? I've never seen any difference. What kind of issues are you having ?? Dirty fuel will bother both of them. Edited by DrAllis - 15 Jun 2021 at 12:17pm

PaulB Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 12 Sep 2009 Location: Rocky Ridge Md Points: 5044	Post Options Post Reply Quote PaulB Report Post Thanks(1) Quote Reply Posted: 15 Jun 2021 at 7:21pm
	Bone stupid simple carburetors, both them. Find the problem and fix what you have. As DrAllis said, most likely dirt somewhere. The other things could be a worn throttle shaft, a bad float, sticking needle valve or cracked venturi. Not much else it could be.
	If it was fun to pull in LOW gear, I could have a John Deere. Real pullers don't have speed limits. If you can't make it GO... make it SHINY

steve(ill) Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 11 Sep 2009 Location: illinois Points: 87101	Post Options Post Reply Quote steve(ill) Report Post Thanks(0) Quote Reply Posted: 15 Jun 2021 at 7:45pm
	A Zenith carb came on a D12 with 139 inch motor... The 149 - 160 inch motors in the D14-15 came with MS carbs....... so the question is, where did your Zenith come from ? Is it large enough / jetted correctly for a larger motor ??? What model carb ?
	Like them all, but love the "B"s.

DrByte Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 13 Jun 2021 Location: Wisconsin Points: 17	Post Options Post Reply Quote DrByte Report Post Thanks(0) Quote Reply Posted: 15 Jun 2021 at 11:49pm
	Current situation is: New Odyssey battery, Spark is good, timing is good, compression is good, fresh 91 octane fuel and lead additive, new points, condenser, cap and rotor, new coil, plug wires and plugs. everything gapped properly. 1243 order. marvel tsx 844 B carb, idle jet 1.8 turns open, Oil bath air filter removed during this testing. When attempting to start, the engine responds when momentary choke is applied, tries to catch then dies. Acts like it is flooded. After a few tries, gas begins to drip from the carburetor intake. Adjustment of float resulted in reduction of drip, but still there.

DrByte Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 13 Jun 2021 Location: Wisconsin Points: 17	Post Options Post Reply Quote DrByte Report Post Thanks(0) Quote Reply Posted: 15 Jun 2021 at 11:59pm
	Thanks Paul ! I will keep the Marvel and rebuild it, hopefully the problem will resolve . As it is, after a few attempts to start up, the plugs foul with carbon and need to be cleaned.

DrAllis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Points: 21723	Post Options Post Reply Quote DrAllis Report Post Thanks(0) Quote Reply Posted: 16 Jun 2021 at 7:20am
	Why don't you open the main jet a couple more turns to see if it will start and run. Generally speaking, if you leave the choke closed while cranking, the engine should start and stay running, albeit with a lot of black smoke until you open the choke. Also, how do you know the ignition timing is correct, when you haven't made it run ?? You have a carb on a second tractor that works, consider a carb transplant for testing purposes. Edited by DrAllis - 16 Jun 2021 at 7:22am

DrByte Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 13 Jun 2021 Location: Wisconsin Points: 17	Post Options Post Reply Quote DrByte Report Post Thanks(0) Quote Reply Posted: 22 Jun 2021 at 9:33pm
	Thanks so much for your help. I ended up rebuilding the Marvel. All seems to be well with the fuel system except for the glass fuel filter that leaks slowly. I am thinking about replacing the fuel line and including a better shutoff valve and filter. Do you have any recommendations ? By the way, the carb was not the problem. It appears that I have now got a very weak spark, only short orange sparks at the plugs. Troubleshooting that now.