When I look at it closely I can see no crack there. Would a crack affect performance because it seems to run well.

check your head bolts arnat a loose i would certainly contact your local dealer even email grp them selves along with trhe pictures but until you are sure what is going on i would stop break in for sure

ya ok. I will email grp and take it to my lhs and see what they say.

i now have 3 of these engines, bloody good engines i have replaced all the bearings in the engine with ceramics from the word go dont let this problem be your decision to go away from grp once it is soughted and you have it in your car you will be nothing but happy with the performance of it and the awsome power band nice smooth engine to drive and nice and fast :nod: i run them in my buggy and truggy :nod:

I wont, I'm not even sure its the engine yet so keep your fingers crossed.

good to hear :) grp awsome

any of you guys using the GRP 4 and 5 plugs? Which is better?

Hey guys I think I found my problem. I took out the engine and cleaned it and saw no cracks even with a magnifying glass and then I took the pipe off. The little rubber piece in between the manifold and the engine had a slit 3 quarters of the way around it which I think made the pipe not sit right on the engine letting the oil/nitro leak out. The bubbling I think was caused by vibration or heat. I am going to run it again soon and I will lyk.

Does this reason makes sense??

It could be. The exhaust could be blowing it toward the front of the engine and it is pooling up there.

I think it was jut going forwards because I was lifting the car up to get at the flywheel to get it out of tdc but would this problem cause a leak like I described??

???

GRP Long Cold Warm up
 

I raced my GRP .21 today and I noticed that it took a good 5+ mins before the engine balanced out. If I tuned it in too soon then 5 mins later it was very lean. I didnt notice this with my last GRP .21 that I have ran for the past 9 months or so since they came out. I know these engines are cold blooded bastards but the lean out was extreme to me. Is this normal or anyone else experienced this. I ended up idling the engine for at least 5 mins before I ever touched the needles.

i cant touch mine for a good 5 min

That looks like quit a bit of oil, but find it hard to believe that the case would be cracked. the GRP has a thick looking case. If you are running it rich still. it could be coming from your exhaust seals. Either from the rear, or from the joint where the header and pipe meet. Clean it good, run it for a minute, and check it. Its easier to track, if you check it right away.

Yeah, dont try to tune these when they are cold. Drive it a bit, get it up to temp, and then make your adjustments. With my GRP, I make most my adjustments in 1/2 hr increments, once im in the zone. They seem very sensitive to adjustment.

ya this was my 3rd break in tank so it was extremely rich so I think this was the problem. I am going to run it tonight and see.

I got my very first GRP engine and it's very difficult for me to tune. I'm on my 9th tank now but it is very inconsistent. I am aware that the tuning is very different from Novarossi engines. Can you please give me a starting point on needle settings? I seem to have a good bottom end resposnse with a thick trail of smoke but it will go flat as soon as I start to reach the top end. I turn the HSN at 1 hour turns but it does not seem to work. Am I still running the bottom end too rich? Or do I need to go leaner on the HSN I would really appreciate your help. Thanks in advance.

guys remember, These engines like to be rich on the top and lean on the bottom. If I remember My hsn is almost flush with the lsn in a little from flush. I will post back with my exact settings, but I would richen up a little from my settings just to be safe

tuning
 

tuning these engines are pretty much like any other you cant tune cold and tuning really depends on the weather conditions and temps of the day once you one gets used to tuning depending on experiance i guess you tune to ear and you know when your motor is running its best.... i never use temp guns to tune a motor my experiance where i race temps are always differnt but the grp motors certainly do run cooler than any other motor i have used in the past :nod: i like the grp awsome motors:nod:

If it is going flat on top, then I would suggest richening it quit a bit (3-4 hrs) to see if it gets better. If its goes too rich, you can always lean it out again. Rich is better than lean. Once you get the top right, you can readjust the lsn.

Tried to order a tuned 28 today and was told that the engine is discontinued and out of stock.

Is this engine now discontinued?

how is the bottom on the grp .21 engine

I dont know if its discontinued but A-main has it in stock atm.

http://www.amainhobbies.com/product_...ducts_id/23450

http://www.amainhobbies.com/product_...ducts_id/23451

You're definitely right about that. I have my HSN almost at flush and my LSN at 2 turns in. So far so good. It doesn't sound like other engines in the market. Unlike the Novarossi engines which has a sharp crisp sound at top end, it has a muffled rumbled that can make you think you're running too rich until you see it bomb down the straight away. Hope everything goes well from here. Wish me luck and thank you everyone.

I have a NEW IN BOX GRP .28 Off-Road "Tuned" Competition Truggy Engine w/2053 Tuned Pipe
* Promo kit comes in handled box which also contains a manifold, EFRA pipe, embroidered GRP cap and more.
If you are interested please PM me.

try mark smith at www.powerhousercperformance.com
he posted on his thread that he has some grp .28"s with his race port on them for like 280.00$ go to his web site and call him on the phone from the contact link ...mark is a great guy ,,,and does super work on motors ....tell him zixxer sent you ...

grp
 

Hey guys I just bought my non tuned 21 today and the tuned promo will be here tommorrow. I will be starting the breakin friday. I have a couple of questions. Are ya'll sealing your motors or do they have a good seal? and the pipe that comes with the tuned version does it work well with the non tuned I have several different ones I can put on it. thnx MW

HEY, I have a GRP.21 & GRP.28 tuned with aprox. 3gallons on each 1. I'm getting ready to install new ceramic bearings in both this weekend. The bearings I bought are TKO ceramics. I noticed the front bearings are rubber sealed on both sides. Should I take the seal off of the inner front bearing so that it can be lubricated thanks

leave both seals on:nod:

grp
 

Can someone answer my qoute questions? I also got my tuned version today. And as luck would have it I got the pit towel and wanted the hat. I am a hat person. Anybody want to trade? thnx MW

I'm not really sure about your question but if you dont want the towel i'll take it!!! I am using the non tuned with an 086 and its pretty good.

maxx90, I seal all my engines

I seal all my engines to prevent any problems. I haven't had and with the 3 grp's I have but I don't want to take the chance. It doesn't matter what engine I run I seal it from the beginning. As for pipe dynamite 086 or 053 the grp 2053 is on the restrictive side and the trinity bad boy pipe was terrible lasted 2 laps and has been new and shiny in my pit box ever since.

Hey guys, silly question here. When you set your idle stop screw, do you set it to the correct spot with the carb restrictors out or with them in? Also, when you change from a 6mm to a 7mm restrictor do you have to readjust your idle? thanks:)

grp
 

Thnx guys anyone need a pit towel I need a hat.

Which GRP plug do you prefer? The 4 or 5?

I run a 4 in the GRP.21 and 5 in the GRP.28. works good for me

I have a tuned .28 and a modded .21. I only sealed both sides of the pinch bold on both engines and they have been perfect so far. i don't have much runtime on them yet. I'll start sealing the carb next time I take them apart, just to be sure.

I just got a 2053 pipe to try on the tuned .28. From what I hear, the pipe holds the engine back a bit, but in exchange you get very good runtime. I first tried a MSR 1005 w/6mm restrictor and was not to impressed. It did run good, but not the power I expected from a 28. The engine was still very tight and should get better as it loosens up. My Powerhouse modded .21 has a JP-1 pipe (recommended) on it. With a 6mm restrictor and the engine is still very tight, preformance was just good. I changed to a 7mm restrictor and have not yet ran it again.

I still have a couple of pipes to try.
2050
2060
might buy an 053

Great motors easy to tune I have 6 of them

I dont run grp plugs in my tuned anymore , I run o.s. p3's. It seems easier to tune to me with the p3. plus they are alot cheaper. You are correct with the 2053 pipe. Runtime is really good with it