I have a 1986 120HP Johnson J120TLCDC on my 19' Edson Challenger GT.
Problem: started last summer. will be cruising WOT (5200rpms) and all of a sudden it will throttle down to 4800prms or slightly lower. sometimes it does not happen sometimes i can go to idle and then take off again and it'll go to 5200 and stay other times it won't get above 4800 for the rest of the trip.
- i replaced all fuel lines to the tank with 3/8"
- replaced in line fuel filter (been there a couple years anyway)
- checked all fuel lines right to carbs, could not find a leak, plus the primer bulb stays firm.
- spark looks good bright blue and 7/16"
- compression great 115-120psi all cylinders.
So i used it all last summer but it's been bugging me. so here is a brief history of the boat. i am third owner. second owner had it for 15 years never did a thing to it except change spark plugs every year. (and a couple AL props). he said nothing never brought it anyway for any work and all he did was spark plugs from 1996 to 2011. so first thing i did was new impeller.
What i discovered about the VRO on the engine. it is not original (should be part#174304) and has a tag on it labelled VRO2, made in Mexico, alcohol resistant part# 174876 (it is a 3 wire VRO). it seems i can only find that VRO number for 1989 models.
Changes i added a water / Fuel separator. that spring So what i was thinking was that the OLD VRO2 pump might be getting week. so been worried about leaning out the cylinders.
So i purchased and have yet to install all new oil line and primer bulb. (tank kit) brp# 5008617.
My questions are:
1) should i change out the old oil line and try again or should i just replace the VRO with the new 5007423 VRO/OMS pump?
2) any other way to test to determine the fuel pressure at wot? i'll have to wait for summer to run it at wot.
3) should i remove the water fuel separator? (don't like this option but...)
Reason ask is the new VRO has a 4 wire harness and i have to modify the engines 3 wire connections (push the pins out and then re-insert them to a new 4 wire connector and add another wire). basically it seems like there is no going back.
Also premix is not an option, and keep in mind there is no hose to put the ears on, lake or any open body of water) we have four feet of snow so my testing is limited to my garage (heated, thank god).
Thanks guys
Problem: started last summer. will be cruising WOT (5200rpms) and all of a sudden it will throttle down to 4800prms or slightly lower. sometimes it does not happen sometimes i can go to idle and then take off again and it'll go to 5200 and stay other times it won't get above 4800 for the rest of the trip.
- i replaced all fuel lines to the tank with 3/8"
- replaced in line fuel filter (been there a couple years anyway)
- checked all fuel lines right to carbs, could not find a leak, plus the primer bulb stays firm.
- spark looks good bright blue and 7/16"
- compression great 115-120psi all cylinders.
So i used it all last summer but it's been bugging me. so here is a brief history of the boat. i am third owner. second owner had it for 15 years never did a thing to it except change spark plugs every year. (and a couple AL props). he said nothing never brought it anyway for any work and all he did was spark plugs from 1996 to 2011. so first thing i did was new impeller.
What i discovered about the VRO on the engine. it is not original (should be part#174304) and has a tag on it labelled VRO2, made in Mexico, alcohol resistant part# 174876 (it is a 3 wire VRO). it seems i can only find that VRO number for 1989 models.
Changes i added a water / Fuel separator. that spring So what i was thinking was that the OLD VRO2 pump might be getting week. so been worried about leaning out the cylinders.
So i purchased and have yet to install all new oil line and primer bulb. (tank kit) brp# 5008617.
My questions are:
1) should i change out the old oil line and try again or should i just replace the VRO with the new 5007423 VRO/OMS pump?
2) any other way to test to determine the fuel pressure at wot? i'll have to wait for summer to run it at wot.
3) should i remove the water fuel separator? (don't like this option but...)
Reason ask is the new VRO has a 4 wire harness and i have to modify the engines 3 wire connections (push the pins out and then re-insert them to a new 4 wire connector and add another wire). basically it seems like there is no going back.
Also premix is not an option, and keep in mind there is no hose to put the ears on, lake or any open body of water) we have four feet of snow so my testing is limited to my garage (heated, thank god).
Thanks guys