You can run the JP-1 but you are gona get horrible fuel mileage. I would personally run the 2045 pipe with a 198 header. In the Losi the stock gearing is 13/48 and I always changed it to 13/50 when running the WS7. I tried 12/48 but that was too drastic and killed my top end too much so you may want to consider 2 teeth bigger on your spur. As for the clutch, yes you are right the WS7 likes a heavier clutch as it does not have the big torque to get the car rolling initally, heavy clutch springs do help this but I always preferred running the standard clutch with the gearing change to help the engine get in it's ideal power band sooner.

Have a RB S7, with the L2G cooling head, need to replace the inner and outer bearings, what are the size bearings that I need? And is there somewhere in the states that can rebuild RB motors? Thanks for your help!

Possible engine issues
 

Hi there. I have a question.

I have a RB W27 (Original) ;)

Sleeve was pinched. :blush:

got about (mmm) 6 tanks through it and here is the problem.

I did another break in and at this point, I seem to get around 4

minutes to the tank. Current temp is about 240 - 250.

Power seems pretty good. will spin a set of bald offroad tires on

dry pavement. Car tend to act like it wants to pull a wheelie (Front end

doesn't come off the ground)

The engine doesn't seem to product a ton of bottom/midrange/top.

Engine is in a Mugen MBX-5. :sneaky:

I get smoke throught the entire rev line. :sweat:

Any thoughts as to why the fuel efficiency is low? :cry:

I'll check if there is some extra drive train load. (just thought of this) :weird:

NOTE: WHEN THE ENGINE IS ABOUT TO RUN OUT OF FUEL AND GOES LEAN

ALL BETS OR OFF AS TO THE AMOUNT OF POWER IT CREATES. IT WAKES UP

AND REALLY COMES (I MEAN REALLY REALLY) COMES ALIVE. LOW END/

MIDRANGE JUST SCREAM. :weird: :tire::tire: I mean like I think could give my

brushless 2650 a run for its money :tire::tire: :weird:

Could it be this engine wants to run at about 260 - 270? I have had a few

engines that run strong at 270..

Thanks :D:D:D

Thanks

Rb ws7
 

The rb ws7 does like to run hotter than most 260-280 is a good temp makes tons of power bottom,mid,top. One problem with the ws7 is runtime a good race tune and i still cant get no more than 7-8 min Tops. Great motors in there prime. Speedyrob

what about the hobby 9 (s5) engine im wondering how hot do they like to run for a race tune ? i mean the last time, i checked it after i got off the track it was about 235 im only on my second gallon.


its a good club racing engine, im running it on my truggy i messing around with my clutch springs to get more punch.

Engine Temp
 

I thought this guy liked heat.

Interesting enough, when it gets lean (out of fuel) it really comes alive.

I'll try this.

Hmm. No carb restrictor or was there. I'll have to check the box.

Thanks

2nd gallon 235 is good dont dont rush leaning the motor out take ur time it needs to drop its nuts AKA breakin. Always tune too smoke and sound if its smoking and not making good revs lean it out. It is making good really good revs there should be a trail of smoke the whole way thru the power band. If its smoking its geting plenty of oil so RUN IT. Hope this helps. Speedyrob

ok thanks i will try my best, to be not in a rush to lean it out more lol.
the last time i ran it there, was a thin smoke coming out of the pipe when i hit the gas . it does have some speed for being on its second gallon

If you feel the engine had good power than run it. If you feel you need alittle more dont be scared to lean the top a hour or two. Your real close to being fully broke-in around the 2nd or 3rd gallon it well go real Rich then you know its time to really start leaning it. I hope you have a great time running your RB. They well provide gallons of fun. Thanks speedy

well im going to see how, it runs with the new glow plug it did start to idle good and a bit more punch, but my battery wire came apart during the warm up lap.

so if i feel i need more, lean the top end out after the second gallon thats a big turn ! i usally turn the the main needle about 1/4 to a half of a turn.

it ran 235 when my low end , was running rich but its proberty a little hotter now but thats when it was about 90@ out and humit.

One hour means like you are looking at a clock and its at 12pm go to 1pm that is called a hour.

Leaning your low-end out well bring the temp up alittle but the high-speed neddle is what really changes tune and Temp. Speedyrob

oh i know that i guess, it coulnt hurt should i do that after the second gallon ?

ok i might have to retune, since i kept on leaning out the low end neddle to stop it from loading up, but it changed after i put a new plug in there was still a light smoke out of, the pipe but while i did lean the low end out i did richen the main neddle about 1/4 of a turn ccw.

now i did get cooler out when i retuned it.

You can start doing that now just take your time the motor well go flat rich during practice, Qaul, Main sometime its around the 2nd or 3rd gallon you just never know when. Its not going to hurt to lean it out 1/4 or one hour at a time. Just get the power your need to clear all jumps and are happy with. Dont be scared to get it to 245-250 temp wise. If its got good smoke Bottom, mid and top and your happy run it. Im sure your going to get alot of gallon thru that motor before needing another.