One more shootout discussion: 288xp vs 390xp

[dustinwilt68]

Not saying they dnt make faster then a 288, but I just dnt think they can make a saw any funner to run.

 

[mdavlee]

Did u port both of thoso yourself? Both r nice runners!

MMWS 288. That was J.Chin 390. I did change it up after that some more. I wasn't happy how it ran there.

 

[danimal]

Lighter, more power, inboard clutch, better a/v, and side chain tensioner. I'll take the 390.

I have 288s n a 390.
Outboard clutch runs cooler, crank n bearings will last longer..

 

[huskyboy]

Anyone guess what cylinder this is? Bet no one knows right away

 

[Onan18]

View attachment 65711Anyone guess what cylinder this is? Bet no one knows right away

930 Jonsered

 

[danimal]

Solo, maybe...

 

[dustinwilt68]

It is deffinetaly a Johnsered.

 

[huskyboy]

930 Jonsered

Bingo

 

[huskyboy]

I really been studying the 930 closely and it's pretty interesting saw. Seems to share no resemblance or parts to its distant cousin 288. I think the coil is one of the only interchangeable major parts.

 

[XP_Slinger]

I had a 920 and miss it...torque torque torque

 

[mdavlee]

I really been studying the 930 closely and it's pretty interesting saw. Seems to share no resemblance or parts to its distant cousin 288. I think the coil is one of the only interchangeable major parts.

There's almost nothing that interchanges. Piston are common only to the 9xx series.

 

[RIDE-RED 350r]

It's a regular 288 kit. But I'm gonna do my best to make it special.

Already seems special to me with that dollar sign cast into it

Scrooge McDuck the previous owner??

 

[huskyboy]

There's almost nothing that interchanges. Piston are common only to the 9xx series.

Pretty cool piston they got on 930, full circle windowed. Mine ended up being the thick ring one, which is a good thing along with the non governed tilly carb. Compared the 930 cylinder to the 910 I got and ports are similar but much larger on 930. The 920 has a 288 style cylinder while the 10 and 30 are bottom fed. I smoothed the lip in the transfers of the 930 cylinder where they stuck a end mill in and converted 920 to 930 cylinders. I didn't port it as it ran good stock. They must have decent numbers from factory. I did delete base gasket though. Just wanted to see how far I can take it without porting and I don't want to mess up a rare saw.

 

[huskyboy]

So far advanced timing .010, muffler derestricted, no base gasket and smoothed transfer lip. Mild mods seemed to make a big gain.

 

[XP_Slinger]

Now you're making me want to hunt up a 920 or 930 at some point. I had mine before I knew how to mod a saw, makes me wanna have some fun.

 

[huskyboy]

I think the 820/830 are same saw but 52mm instead of 54mm piston. Both 38mm stroke. I wonder how they run compared to the 9's ? Probably like comparing a 281 to a 288.

 

[mdavlee]

They are. Good running saws as well. I wish parts weren't so hard to come by

 

[rattler]

 

[huskyboy]

View attachment 65824 View attachment 65825

Is that a 70e? Nice saws

 

[rattler]

Yes Sir it is.

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