Best way to lower compression?

[Timber_12]

Looking to lower the compression on my UBR 900. I'm not sure of the engine specs but it has a bit much compression for me to pull it over (more than 12 times) repeatedly. It's also a pain in the buttocks when I'm in a super awkward position trying to get it running and unstuck.

The ways I know would be to cut the head or thicker base gasket under the jugs.

Any other ways? What are the benefits or drawbacks?

Thanks!

 

[JMCX]

Head change is the only way that won't mess with tune too much. What engine is this based off?

What clutch you running? If you you can add the starter ring gear the extra weight adds inertia and makes pulling over easier. If you don't believe that try removing your clutch and I'll bet you can't even get the rope out once.

 

[lilduke]

Lower yer compression to make easier to start?? sounds retarded,,, get Electric start if you can't pull it over

 

[Bnorth]

Cheapest is a thicker base gasket but that affects your port timing. I would find lower compression domes or get yours cut but leave the squish band alone.

 

[pano-dude]

if ya can't start it, ya shouldn't be riding it.....

 

[moyiesledhead]

if ya can't start it, ya shouldn't be riding it.....

My wife growls when I tell her that.....then I start her sled for her!

 

[tantrumpipeline]

if ya can't start it, ya shouldn't be riding it.....

Obviously never seen him ride, the union bay is a monster, not the first time I've seen people talk of the same issue, the iqr it's in is pretty rank too, I'd just sell it though and put a TSS kit on your xm timber

 

[AreWeThereYet]

Thats not Timber with Poncho is it

 

[CatMan16]

Don't put oil in it. Guaranteed to lower the compression.

 

[pano-dude]

My wife growls when I tell her that.....then I start her sled for her!

Hahaha, mine too. That's why she's got e-start.

 

[Longhairfreak]

Looking to lower the compression on my UBR 900. I'm not sure of the engine specs but it has a bit much compression for me to pull it over (more than 12 times) repeatedly. It's also a pain in the buttocks when I'm in a super awkward position trying to get it running and unstuck.

The ways I know would be to cut the head or thicker base gasket under the jugs.

Any other ways? What are the benefits or drawbacks?

Thanks!

Are you a pussy? You should try pulling an 1160 over when its cold.

 

[Pink-Inc]

Buddy of mine ran a 1300 Cutler last year. Tried to start it one night after it sat on his sled deck for two days and was just pulling the sled off the deck instead of pulling it over haha

 

[pfi572]

Timber take to domes over to Steel Industries and have the cc's enlarged. They will open up the dome part and reduce to Comp.
Failing that try Split Second @ 1-780-534-4330

 

[tantrumpipeline]

Are you a pussy? You should try pulling an 1160 over when its cold.

That thing has actually left the garage before? Or did the space heater die once?

 

[Timber_12]

Thanks pfi572. I never thought of trying steel industries!

 

[goodtogo]

Hey timber I can't remember what size cc domes I used when I built that motor but just phone fasttraxx they will hook up with bigger cc domes

 

[JMCX]

Sometimes a larger diameter recoil can be adapted to a different engine giving you a mechanical advantage. That's why I asked you what motor this is based on.

 

[new24stroke]

Thanks pfi572. I never thought of trying steel industries!

Why not try the Mod Shop. I've had him make me domes before. I'm sure he could reshape yours

 

[pfi572]

Why not try the Mod Shop. I've had him make me domes before. I'm sure he could reshape yours

^^^^^^x2

Yes to Mod Shop also.

 

[Timber_12]

JMCX Thanks for the idea! It's a UBR bottom end based off the polaris big block.

Thanks Kyle! I had forgot about the 5mm thicker base gasket!.