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GP290 vs. G260

Old 06-11-2009, 12:27 AM
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Default GP290 vs. G260

I decided to get a new engine for the baja. I was pretty sure that I wanted a GP290. It's 28.5cc vs. the stock 26cc engine that comes with the baja plus it has the stock stroke stuffed crank. Well, it's been like 2 months since I decided that I was going to replace the engine with the GP290, and the engine still isn't in stock at DDM. I've been beginning to wonder if it would be a better choice to go with the zenoah G260. Is the G260 just as good? Is it better? Right now I'm basically looking for a combination of low end and high end. I thought with the GP290's combination of higher volume and stock stroke crank, that it would give me just that. But is my thinking correct? As always, advice and suggestions are appreciated.
Old 06-11-2009, 08:23 AM
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Default RE: GP290 vs. G260

Which baja do you own? I personally love the Zen motors. They are a better breed of the 2 strokers. If you own the FG baja, then you already have a Zen26. I'd just order a ported 26 topend or a 27.2 topend which would be a stroker. Either way, you cant go wrong. The CY motors are ok but nothing compared to the Zen motors. The ported 26 is a great kit which has lots of RPM and the 27.2 is a nice combination of RPM and torque. Remember, with  these motors, you dont have to buy a new motor all the time. You can just buy a top end. Thats what I love about them.
Old 06-11-2009, 09:31 AM
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Default RE: GP290 vs. G260

Thanks for the input. I have an hpi baja 5b ss, so the 26cc motor is cy. I've thought about a top end, and I've done it before, but the engine I have right now is in rough shape. Somehow when I was taking out one of the bolts holding it in place, part of the flywheel housing busted off, it has bad compression (which a top end would probably fix), and I can't get it start (probably an air leak somewhere that I haven't found). I had been thinking about picking up either a zenoah or more powerful CY for a while, and this kind of gave me an excuse.
Old 06-11-2009, 09:58 AM
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Default RE: GP290 vs. G260

More power more parts breakage. More money to spend.
Old 06-11-2009, 11:32 AM
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Default RE: GP290 vs. G260

The quality of a Zenoah engine is unmatched.....hands down[8D]
Old 06-11-2009, 08:59 PM
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Default RE: GP290 vs. G260

Well, if you have to get an entire motor, then a Zen26 would be good. Ported and or stroked would be better but a stock Zen26 will definetly out perform the stock CY26.
Old 06-11-2009, 10:26 PM
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Default RE: GP290 vs. G260

ORIGINAL: Got_to_100_now_die_hatin

Well, if you have to get an entire motor, then a Zen26 would be good. Ported and or stroked would be better but a stock Zen26 will definetly out perform the stock CY26.
Yeah, I know the Zen26 will out perform the stock CY26, but I guess my question is will the Zen26 out perform the GP290? I'm kind of looking for the best bang for my buck. My price range that I was thinking of spending is somewhere around $200 - $250. When you get into ported Zen engines you're looking at $300 - $400, which is more than I care to pay.

Old 06-12-2009, 12:14 AM
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Default RE: GP290 vs. G260

From what I have seen I am not impressed by the GP290. I have seen several videos with the GP290 and it looks rather slow. I can almost guarantee you that the Zenoah 260 will outperform the GP 290. Buy the Zenoah and you will not be dissapointed.
Old 06-12-2009, 05:39 AM
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Default RE: GP290 vs. G260

if i were in your situation for a new engine , do what i have done . get a zenoah crankcase and put a raceported ESP 30.5cc with a 2mm stuffed stroker and an 813 carb  and zero drag seals, its a killer topend and bottom end combo with heaps of power , ive done this to my FG MT and its screams it hits the high revs and powerband very quickly , actually i am very surprised and happy with it cos i run TS induction crankcases with the same topend kit in both my baja5b's cos i wanted to have the high performance rev range and it does that with the TS crankcases , but surprisingly it works as well nearly the same as a TS crankcases if you just get the zenoah crankcase with raceported ESP 30.5cc with a 2mm stuffed stroker and an 813 carb  and zero drag seals ,
Old 06-12-2009, 05:46 AM
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Default RE: GP290 vs. G260

why not go straight for a G270 zen 4 bolt, more power than the G260 despite what the specs chart says, and its in your price bracket!
Old 06-12-2009, 05:48 AM
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Default RE: GP290 vs. G260

do esp make four bolt topend kits in the 30.5cc range ?
Old 06-12-2009, 06:04 AM
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Default RE: GP290 vs. G260

i think they stop at 27.2 in 4 bolt ?
Old 06-12-2009, 07:37 AM
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Default RE: GP290 vs. G260



The G260 will definetly outperform the CY290 and its more reliable. I'd forgot about the G270 but like Mcspanner said, its a great motor. Right now I think that Zen are the only ones that make a 4bolt so you cant get a 30.5 in a 4 bolt but trust me, I had a 27.2 and there wasnt a 30.5 that can outrun my Baja. I've actually changed to a G260 since then. And remember, a 30.5 still a CY motor.

Old 06-12-2009, 08:26 PM
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Default RE: GP290 vs. G260


ORIGINAL: RCguru09

More power more parts breakage. More money to spend.
BSR, I think you realy shoul elaborate much more because that is absolutely not true in many cases. For example, a 26cc Zen is just as reliable as a 23cc Zen, the 26cc Zen will not break mroe than its smaller 23cc Zen. Both of these engines are absolutely reliable, and even though the 26cc is more powerful than the 23cc Zen, I have yet to have the 26cc break!

Old 06-13-2009, 01:38 AM
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Default RE: GP290 vs. G260


ORIGINAL: SAVAGEJIM


ORIGINAL: RCguru09

More power more parts breakage. More money to spend.
BSR, I think you realy shoul elaborate much more because that is absolutely not true in many cases. For example, a 26cc Zen is just as reliable as a 23cc Zen, the 26cc Zen will not break mroe than its smaller 23cc Zen. Both of these engines are absolutely reliable, and even though the 26cc is more powerful than the 23cc Zen, I have yet to have the 26cc break!

I think he was referring to parts on the car breaking (dog bones, diff cups, etc.). That's the way I took it anyway.

Old 06-13-2009, 01:56 AM
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Default RE: GP290 vs. G260


ORIGINAL: splcrazy

if i were in your situation for a new engine , do what i have done . get a zenoah crankcase and put a raceported ESP 30.5cc with a 2mm stuffed stroker and an 813 carb and zero drag seals, its a killer topend and bottom end combo with heaps of power , ive done this to my FG MT and its screams it hits the high revs and powerband very quickly , actually i am very surprised and happy with it cos i run TS induction crankcases with the same topend kit in both my baja5b's cos i wanted to have the high performance rev range and it does that with the TS crankcases , but surprisingly it works as well nearly the same as a TS crankcases if you just get the zenoah crankcase with raceported ESP 30.5cc with a 2mm stuffed stroker and an 813 carb and zero drag seals ,
I've been meaning to find out at some point, what's the differenece between Race Ported and ESP modified?

Old 06-13-2009, 10:50 AM
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Default RE: GP290 vs. G260

That is a very good question. One major difference between modders, sayTS vs Tom Bowlin, is that they do different mods. Once modder willincrease the timing profile of a given engine to a set of durationswhile another will increase the timing profile to a different set ofdurations.
And in addition to increasing durations, improving the flow postcross sectional areas is another area in which they canb differ. Onemight shoot for one port shape and cut the ports accordingly. Anotherwill go with a different port shape.

And now, some modders also custom make parts to bolt on these engines: Zen G230, 340, 260, 270, or whatever (even for the CYs).

Just what would the difference be beteween an ESP and a TS? Hard totell. But clearly, TS will put on alot of custom built parts like reedintake "plenum," even a custom TS lower end crank case and clutchhousing, etc.

As for what makes a TS worth $1000 and the ESP about $550? The TS doesthrow on alot of custom hardware. Both I am sure have some sort ofporting. But what those porting work entails? (Timing profile, portreshaping, etc.), I do not know. There is absolutely no way to knowunless you buy a TS Zen modded G260 and tear it down your self andmeasure up the critical dimensions yourself.
Old 06-13-2009, 12:44 PM
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Default RE: GP290 vs. G260

Thanks for the explanation SavageJim. That wasn't quite what I was asking, but I was still curious about that as well, so it was still very relevant. I was looking around a bit on DDM's site and I kind of figured it out for myself. It looks like ESP does the mods like you were talking about in your post, while DDM does the race porting where they enlarge/reshape the intake, exhaust, and transfer ports. I'm guessing these are two different processes.

So this begs the question, which is more beneficial? ESP modifiied, or DDM Race Ported? On the top end kits, it looks like the "claimed" horsepower on the DDM Race Ported top ends is usually the same or more than the ESP modified ones, but I get the feeling that they may be a bit biased about that.

FYI, these questions are coming from me mulling over splcrazy's idea of a zenoah crankcase with a modified top end kit.
Old 06-14-2009, 08:37 AM
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Default RE: GP290 vs. G260


ORIGINAL: cheezer1222


ORIGINAL: splcrazy

if i were in your situation for a new engine , do what i have done . get a zenoah crankcase and put a raceported ESP 30.5cc with a 2mm stuffed stroker and an 813 carb and zero drag seals, its a killer topend and bottom end combo with heaps of power , ive done this to my FG MT and its screams it hits the high revs and powerband very quickly , actually i am very surprised and happy with it cos i run TS induction crankcases with the same topend kit in both my baja5b's cos i wanted to have the high performance rev range and it does that with the TS crankcases , but surprisingly it works as well nearly the same as a TS crankcases if you just get the zenoah crankcase with raceported ESP 30.5cc with a 2mm stuffed stroker and an 813 carb and zero drag seals ,
I've been meaning to find out at some point, what's the differenece between Race Ported and ESP modified?

I found out the hard way and here's your answer. A racer ported motor is when they port the motor for better fuel flow and ofcourse more power. This is done to the head and some work is slightly done to the crankcase as well. Now, modified by ESP is when he bores the head for it to be able to accept a 2MM stroke crank. So just because its modified, doesnt mean its ported, or the other way around. If you get a modified head, you will need a stroker crank. Right now ESP isnt offering any ported heads alone. The only way you can get a portedhead by him is the buy the entire motor done by him. If you look in the Dave site, you'll see headsthat say "ported/ESP modified. That means its ported inhouse by Daves people but the head is bored for the 2MM crank by ESP.

Iknow its a little confusing but I bought an ESP modified head and put it on my stock bottom. It ran like crap and I was wondering what all the hype about ESP was until I spoke to him directly and he explained what was the problem. I then bought a ported/modified 27.2 from ESP and realized what the hype was about.
Old 06-14-2009, 09:45 AM
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Default RE: GP290 vs. G260

so, did the engine run like crap because you were running the stock crank, or because you still had the stock crankcase?
Old 06-14-2009, 01:28 PM
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Default RE: GP290 vs. G260


ORIGINAL: RCguru09

More power more parts breakage. More money to spend.
Thats not always an issue... just gotta avoid those posts that grab the rc at random.

Old 06-14-2009, 01:29 PM
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Default RE: GP290 vs. G260

You could also consider a race ported 28.5 from ONB, i run one in my rampage mt with 813 and 77dom pipe and it screams, loads of power and torque and still revs real hard. I ran 26 zen in my fgbaja before but switched to cy for the extra cubes i also prefer the cy crankcases cos they're way better port matched than zen cases so less grindin for me to do.
Old 06-14-2009, 10:29 PM
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Default RE: GP290 vs. G260

I was looking at their site. What are the red cap engines? Are those CY, or are they an entirely different brand?
Old 06-15-2009, 09:29 AM
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Default RE: GP290 vs. G260


ORIGINAL: cheezer1222

so, did the engine run like crap because you were running the stock crank, or because you still had the stock crankcase?
I was indeed running the stock crank in a modified headkit. But like I said before, Ithought modified was just ported, not bored to accept a stroked crank. ESP even told me that he was surprised it ran at all. I've learned a lot since.
Old 06-15-2009, 09:33 AM
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Default RE: GP290 vs. G260


ORIGINAL: cheezer1222

I was looking at their site. What are the red cap engines? Are those CY, or are they an entirely different brand?
Someone might correct me on this but from what I remember, the "redcap" is for the fact that the sparkplug boot had a redcap and that cap only came in Zen G260 back then. Since then, I've seen more and more CYs come with it so I guess its just a part of their copying process. When kids would come into the shop and say that they had a "redcap" motor, we automatically knew that they had a G260 which was a big deal then because a ported G260 was king of the hill then.

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