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HPX 4X4 fast idle and coil fd620d

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Coachlarry
Join Date: Apr 2016
Posts: 57 Southern californai
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2019-03-14          198249


2006 basket case build.
Compression to spec
Fuel pump to spec
Governor to spec, slow idle smooth
Spark to spec
Vacuum to spec
Fresh rebuild on carb with new jets, solenoid, and heater

Fast idle only up to 2900 rpm, book says 3400. Went to look at coils and saw only one pulser coil on right mount. From what i gather, this setup only uses one, but want to make sure.
Very soft occasional backfire at slow idle. Wondering where to go next that would cause loss of 500 rpm. Thank you,

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HPX 4X4 fast idle and coil fd620d

View my Photos
minimac
Join Date: Jun 2013
Posts: 70
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2019-04-06          198314


Did it ever run 3400 before and after carb rebuild? ....

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____________________________________________________________________________________
HPX 4X4 fast idle and coil fd620d

View my Photos
Coachlarry
Join Date: Apr 2016
Posts: 57 Southern californai
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster

2019-04-06          198316


Quote:
Originally Posted by minimac | view 198314
Did it ever run 3400 before and after carb rebuild? ...


No. The rear cylinder is 155psi, 170 is spec. But it’s runs a bit rough at full throttle, Moreno than I would think and doesn’t get to spec rpm. I think it might need rings in tha cylinder. I did squirt oil in plush hole and got increase in compression. I can’t get to a rebuild until summer. I have carb jet drill bits and am tempted to increase the fuel a bit. Any thoughts? ....

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