how does the Odonnel 99 plug compare to a 100 plug?

99's are harder to tune, they are still decent though ;)

OD99's are a good plug, Just a bit harder to find a good tune. I have been using the OD 100 in my Nova N21R 3 Port. Just ran a Club Race this past Saturday. Used the 9886 Pipe, Jammin Smooth Round Header, and OD 100 Plug. After a 5min Qual, I had over half a tank left. Timed a few tanks this past sunday, Ran out of fuel @ 11:11, 11:16, and 11:21. :D

I just recently picked up a p5xlt. I run a X2 Truggy and am looking for pipe and header combo's along with clutch spring advice. I have read all the pages and I haven't seen much about what springs to run.

I plan on running a 97T glow plug, and I have few JP pipes an header to choose from ie. JP1 and JP3 but i'm looking to buy the BEST header and pipe combo. I race a in California so i'm at sea level. The track I normally run at is medium in size with not a real long straight. I'm looking for proven combo's please no guessing. what do you guys suggest and why is important to me. This is my first Rossi and hope it is the first of many, I have heard alot of good thing, I hope the are all true.

Thanks for the help in advance.

Eric

I'd go with the Nova 9886/ Ofna 086 and 41021 Header on the Nova Pipe or Jammin Smooth Round Header on the Ofna Pipe. Just my opinion!

I almost forgot I was reading in past pages about using the crank out of a 21-4. Does that work w/o any mods and what were the results?

i dont recommend things for no reason;)

price no option?

yes , they are pricey but there is a lot of magic in a crank :nod:

No, but just to be safe so I don't ask again, give me a few options please. And what crank is recommended and what does it do?

9853 short round header
 

If the track is medium sized, I would use a 9853ss with the short round header on the p5.

thats a good combo for a lot of low end and a good mid/top , balance it out a lil more with 41005 header :nod:

hmm
 

What are the differences between the short round and square headers? I used the square one back in the day with the 9886pipe, but finally got a 9853 and loved it, but with the round header. Honestly I really don't know what the differences are between those two headers. I know they are both high speed headers right? Penny for ur thoughts.....

I don't use 41005 header on 86 based pipes , always feels like a lean bog , the round headers on the 53 based imo makes the pipe flat on top but crazzzy torque . So 9886/41021 or 9853ss/41005 if you are on a really short track try the 41021.


Now where's my penny?? LOL

The 41005 is a shorter header and combined with the 86 series pipes, the overall length is too short for the engine to scavage properly making it feel very flat on bottom or what can be described as a lean bog or clutch bog. The shorter 41005 header combined with the longer 9853 tuned section or the longer 41021 header with the shorter 9886 tuned section will have a little different running characteristics but because the overall pipe lenghts are similar, they will both tune and perform pretty well. It will be a personal preferance as to what you prefer for overall power delivery characteristics.