HELP - Fuel Moto 107 install
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Joined: Oct 2010
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HELP - Fuel Moto 107 install
I went up to the Fuel Moto 107 with thundermax ecm and have been installing the last few days. I went to start it yesterday and it just spun over. I had spark, fuel and air, but it would not start. I called Zippers thinking the thundermax may be at fault and talked to their tech support. He told me to reinstall the factory ecm just to see if it would at least start with it. I did and still would not start. He told me that it was a mechanical problem somewhere since it would not start with my factory ecm either. I pulled the cam cover and double checked that the dots were aligned on the cams and sprockets. I checked all the wire plug ins on the throttle body and made sure the wiring on the injectors wasnt hooked up backwards. Thinking the pushrods may have been adjusted wrong, I adjusted the pushrods 3 separate times and it still would not start. Finally I went up to the local auto parts store and got a Actron cylinder compression tester. Hooked it up to the cylinders and when I turned the engine over the needle barely moved. Now Im thinking I have no compression. This morning I got up and pulled the whole top end down to the pistons, thinking maybe I put the rings in wrong. The rings were in the correct slots, "n" facing up and ring gaps staggered. Just got finished putting the top end back on with new gaskets. Reinstalled the map on the thundermax and turned the engine over. It still turns over but will not start. I have fuel, spark and air but the engine will not start. It backfires about every 8-10 revolutions but that is it. Does anyone have any ideas of where I need to look next?
Road Warrior
Joined: Nov 2009
Posts: 1,444
Likes: 1
From: SC
do you have compression after reinstalling the cyl the second time. Did you hook the plug at the air filter back up. The spark plugs are on the right spot right?
Sounds like a timing issue to me if you have compression.
Also if you don't have compression it could very well be the pushrods are not adjusted properly. Making the exhaust valve stay open all the time thereby no compression.
Sounds like a timing issue to me if you have compression.
Also if you don't have compression it could very well be the pushrods are not adjusted properly. Making the exhaust valve stay open all the time thereby no compression.
Elite HDF Member
Joined: Jun 2008
Posts: 4,109
Likes: 9
From: Connecticut
I think you may have bent the valves. did you wait and let the lifters bleed down before turning over?
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Road Master
Joined: Jul 2009
Posts: 1,052
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I don't know the answer to my own question. Is there a difference between the exhuast and intake pushrods? Maybe if so you have them switched.
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Road Warrior
Joined: Nov 2009
Posts: 1,444
Likes: 1
From: SC
Yes, there is a difference in the intake and exhaust pushrods.
You have to make sure you let lifters bleed down. I always do the pushrods twice. I adjust them by the book. Then run them in some and do it again. This is a really important part of the build process.
Here's a link to pdf for the harley easy adjust but the process is the same for all adjustable rods. http://www.harley-davidson.com/en_US...ts/-J04545.pdf
You have to make sure you let lifters bleed down. I always do the pushrods twice. I adjust them by the book. Then run them in some and do it again. This is a really important part of the build process.
Here's a link to pdf for the harley easy adjust but the process is the same for all adjustable rods. http://www.harley-davidson.com/en_US...ts/-J04545.pdf