both the 086 and the 2072 are great for that motor!.throw a dart and see which 1 you get!....go was made for the GX motors so if you can get 1 i would go with that,but every1 LOVES the 086 aswell

I would say the 086 might suit your needs. The 2072 on the GX-5R has stump pulling bottom end as well as good mid and top, but is not as economical as the 086. The 086 on the 5 Port will tend to smooth the bottom end a bit and enhance the top end, which will give you a smoother and wider overall powerband, plus added economy.
GX-5R with 086 in buggy = nice. GX-5R in truggy, I would tend to stay with the 2072 if you run tighter tracks. Open sweeping tracks go with the 086 in the truggy too.

not me! i bought a 086 and dint like the low end at all! also bought a 053 and was alot better, 053 for a small to mid size track, 086 for a large open track

+1......right on!

+1...yeah what he said

how many tanks should it be until i can turn my engine over by hand pretty easy? like 15? im not saying really easy but i mean i aint trying my hardest lol

with fly wheel on,about 15/20 tanks for the new gx-r series. older engines at least 1 gallon+. On the newer gx series they loosened the pinch a bit.

Guy's, quick question with regards to the "older" 3 port engine.....



Got an endurance race coming up soon, 6 hour 4 man team, and to keep a level playing field the above mentioned engine is included in the entry fee, BNIB.
Engine will be fitted in a Losi 1.0B, track is ALL astro, looking for recommendations on clutch, pipe and plug set up ?
Not looking for "balls out performance", more a middle of the road medium, good fuel consumption is a "must".

I ran a "gold top" 7 port a few years back, iirc i was using a RB#6 plug with an extra plug washer, pipe wise was a HN2047, would this combo work well with the 3 port ?

odonnal 77 plug if its a standard button, and 086 pipe, losi clutch set up with all aluminum, 2 green springs/2 gold springs

Hi

I am running a GX-5R with a 2072 pipe had the engine for about a month now and still I am not happy with tune, I have followed the braking in bible and used the helpful tuning tips on the massive mods website.

I have tuned the lsn so I have a good linear power and only have adjusted the hsn just over a quarter of a turn from flush.
Unfortunatly here in the UK the weather is not always the best, and was racing the other day at the track and would sometimes just dies after about 6 mins of racing.
Still had plenty of fuel in the tank
Still go loads of smoke all way to full throttle and when I put my hand near the exhaust I am getting a good amount of fuel (so that tells me I am running rich) but the engine was red hot to touch!!!
Why would this be and why would it cut out, The weather did start to rain very lightly and other races seems to have no problems to adapt to it.

what % fuel do you run? properly shimmed? plug?

sounds like u have leaned the HSN to far IMO, u need more pressure to push the fuel past the HSN as your tank volume de-creases, try to richen the HSN 1/8th of a turn & u should be good.
the HSN on the GXs is very touchy so only lean 1/16th at a time ! HTH

what fuel? try OS P3. For some reason I've stopped using Tornado fuel with my GX-5R. The bottom had to be rich or it'll lean bog with that fuel...

I am running Optifuel Race 25% with the Go Hot plug (T3 I think)

I am using the standard stack of shim