I drove the donor back from Denver to LA on Tuesday. It’s a 1990 JDM HZJ73. I was surprised at the compression:
1: 515 psi
2: 520
3: 540
4: 490
5: 500
6: 500
This engine must have been rebuilt. 584k km on clock. No blow by.
Didn’t take a photo with 1100 lbs of bikes in the back today- wasn’t too proud of how saggy it was looking! But handled it no problem. Here’s the dirtbike headed out to the desert this earlier summer. The Ram does it’s fair share of hauling.
***UPDATE – August 12, 2025***
For those who have reached out regarding the 1HDT and 1HZ engines:
I will be having both engines compression tested in the coming weeks. Once the tests are completed, I will update this post/ad with the...