swapmeet
Brotastic
- Location
- Arlington TX
Purchased a "JM/Blue 781 Big Bore" from Chris aka JetManiac
It was a big purchase for me, but the value seemed to line up with my budget vs larger motors that would require an addtional $1 in carbs, or exotic ingntion.
Value 5 out of 5
Performance 4 out of 5
Customer Service 5 out of 5
I found that I was constantly wrenching on my 61x 701 for one reason or another. As a fellow rider says riding > wrenching.
I'll try to keep this short, but the gist is that I ordered the motor from Chris, and asked that he include a pair of freshened up 38mm carbs (his suggested size) and a intake, gaskets etc. The carb part of the equation was the biggest value IMO. I think I paid $400 extra for the carbs complete. But to have nice clean fresh carbs that were already tuned within a half turn of the adjustment screws was so nice.
Aside from the carbs, the basic package is a brand new short block, new(reman?) crank/ rotating assembly, 62T Cases, 61x Cylinder bored out) and freestyle ported by "Blue" a member here also from FL. Also includes ADA girdled head and flywheel cover, stainless hardware, all new seals and gaskets.
I supplied ignition, flywheel, starter, exhaust, coupler, etc. (that I painted)
The motor shipped (painted in the color requested at small additional charge) in a well padded box. I don't recall the lead time from when I placed the order. It seemed a little long but i'm impatient so that can be taken with a grain of salt.
Communication was great up front, updates were a little slow during production. Once received Chris was outstanding at fielding questions that could not be answered in his instructions/ break in documents. Very happy overall with the purchase.
Speaking of, the motor shipped with a very specific document that lined out how to break in the motor, what ratio of gas to use, when to adjust the carbs etc. It was very helpful.
I prefer limiting power for the sake of reliability, for that reason I do not run total loss, race gas, etc. My motor has a Enhancer, 91 octane domes (37cc I think, measured 200psi last time I checked.) I haven't had to mess with my motor once for any reason since it was built. That equates to value IMO... A durable trouble free motor.
It is powerful, the power is very linear, it doesn't have that rubber band/ light switch power band like some motors i've been on. It has a nice low end hit and pulls nicely through the power band. I don't use a tach so I can't comment on specifics.
One note: When I first installed this in my RN SJ, I was a little let down about the increase in power over the 61x it replaced. Once I put the same engine in my Carbon/Kev Backie Chan, it felt like a monster. Which at the end of the day means it feels and hits like a monster and it runs and runs and runs.....
I would absolutely recommend this motor and JM to another member
It was a big purchase for me, but the value seemed to line up with my budget vs larger motors that would require an addtional $1 in carbs, or exotic ingntion.
Value 5 out of 5
Performance 4 out of 5
Customer Service 5 out of 5
I found that I was constantly wrenching on my 61x 701 for one reason or another. As a fellow rider says riding > wrenching.
I'll try to keep this short, but the gist is that I ordered the motor from Chris, and asked that he include a pair of freshened up 38mm carbs (his suggested size) and a intake, gaskets etc. The carb part of the equation was the biggest value IMO. I think I paid $400 extra for the carbs complete. But to have nice clean fresh carbs that were already tuned within a half turn of the adjustment screws was so nice.
Aside from the carbs, the basic package is a brand new short block, new(reman?) crank/ rotating assembly, 62T Cases, 61x Cylinder bored out) and freestyle ported by "Blue" a member here also from FL. Also includes ADA girdled head and flywheel cover, stainless hardware, all new seals and gaskets.
I supplied ignition, flywheel, starter, exhaust, coupler, etc. (that I painted)
The motor shipped (painted in the color requested at small additional charge) in a well padded box. I don't recall the lead time from when I placed the order. It seemed a little long but i'm impatient so that can be taken with a grain of salt.
Communication was great up front, updates were a little slow during production. Once received Chris was outstanding at fielding questions that could not be answered in his instructions/ break in documents. Very happy overall with the purchase.
Speaking of, the motor shipped with a very specific document that lined out how to break in the motor, what ratio of gas to use, when to adjust the carbs etc. It was very helpful.
I prefer limiting power for the sake of reliability, for that reason I do not run total loss, race gas, etc. My motor has a Enhancer, 91 octane domes (37cc I think, measured 200psi last time I checked.) I haven't had to mess with my motor once for any reason since it was built. That equates to value IMO... A durable trouble free motor.
It is powerful, the power is very linear, it doesn't have that rubber band/ light switch power band like some motors i've been on. It has a nice low end hit and pulls nicely through the power band. I don't use a tach so I can't comment on specifics.
One note: When I first installed this in my RN SJ, I was a little let down about the increase in power over the 61x it replaced. Once I put the same engine in my Carbon/Kev Backie Chan, it felt like a monster. Which at the end of the day means it feels and hits like a monster and it runs and runs and runs.....
I would absolutely recommend this motor and JM to another member
