270R flat track engine assembly*Updated*Pictures of sleeve damage

[Billy Golightly]

Well the flat tracker motor is almost back together. This thing should seriously rip when I get it back in. List of mods:

LRD/Curtis Sparks (Cylinder has LRD on it but has a place behind it that was all ground out, Ronnie says its the same measurements as a Sparks cylinder though. So maybe someone sent it to LRD for clean up or something and they erased the Sparks engraving? Who knows, its got some bad ass porting either way for sure.) Bored to 69mm using 83-87 Pro-X YZ250 piston kit. Bead blasted and surfaced top and bottom by Ronnie.

Cometic 1/8th spacer plate to make up for the difference in wrist pin location from the 250R-YZ250 pistons.

Cometic .043 big bore head gasket.

Custom re-domed head, and surfaced from Ronnie.

Brand new OEM head studs, with stainless nuts and washers from Ronnie.

New custom ultra hard extended length stainless steel cylinder/case studs and dowel pins from Ronnie. These mofos won't be stretching any time soon

Hinson clutch basket.

Brand new OEM Honda clutch basket needle bearings.

Brand new Hot Rods Long rod 250R performance crankshaft.

Brand new OEM Honda '89 crankshaft gear.

New OEM main bearings with the extra balls, and crank seals.

Brand new OEM Honda clutch hub.

Hinson Pressure plate.

'89 clutch update (previously done).

Stainless side case dowel pins from Ronnie.

Boyesen Pro-series carbon fiber reeds on modified stock reed cage.

Brand new ESR/Sudco/Kehein 39PWK Carb.

Brand new ESR Billet exaust flange.

New center case, clutch cover, stator cover, etc gaskets.


I think thats about it, more pictures in the next post.


Edit: Actually I just realised 69x72 is 270cc and not 265. Oops

[Billy Golightly]

Last pictures. My tables a mess I know

[dirtface]

Billy, Did Your wife give you permision to build your greasy motor on the kitchen table?

[Billy Golightly]

Haha I'm not married, but I did slip it in the house past my mom into my room and it was there a few days before she noticed

[BigGreenMachine]

You never bothered to lighten the flywheel?

What else have you planned chassis wise?

[Jason Hall]

Look's good billy, It should really run good for ya. That long rod crank should give you a little more torque to pull off the turn's. Good luck with It.

[Billy Golightly]

No I didn't mess with the flywheel. I'm currently in the camp of thought that believes you need the flywheel mass if you are a larger rider or will be doing a lot of up and down shifting for the torque. If I weighed say 120-130lbs and wasn't going to be doing up and down revs in the corners I'd definitely lighten the flywheel AND the counter balancer but for my size and application I think I'm gonna leave it alone for now.

Chassis wise, I'm looking into an all new rear suspension setup I'll be making from scratch using lighter weight components, with a never before seen type of geometry to keep the suspension components at a lower center of gravity (Think, horizontal ) And I'll also be working on slowly lightening up some of the main big components such as the triple clamps, frame, motor mounts, and hubs.


Thanks Jason, I think it'll run good. Maybe I can bring it along with me to TF and see how it runs on the strip? Doubt it'll be as fast as my 500 but who knows

[3leggeddog]

looks real good billy.man you shoulda painted those center cases black to bring out the bling!!looks nice though!!!!

[wheelie king]

MMMMMMM... that looks delicious!!!! Perfect for the center piece.

You know, I am glad you said that about the flyweel. I think that the weight of the flyweeel being heavier will benefit your torque, and keep it spinning better during rapid shifting. Reason I say that is, at least for us 200 (+) pound riders, Is that in your engine, it is harder to stop something heavy that is spinning fast. Therefore, reason not to mess with the flywheel, so you will have more force when you are upshifting when you dump the clutch, and putting more torquey power to the ground.

Well, enough for the redneck physics lesson, just my .02.

And Nice motor.....did I mention that????????

[Pete]

lookin good Billy

[Bryan Raffa]

AHHHHHH..... the Heart of a yamaha, someones learning something...LOL

[Jason Hall]

How bout an oval at TF07. There would be a bunch of people willing to give It a whirl don't Ya think. It would be some Intense racing & I bet the owner's of Haspin would make It happen for us with a little beggin.

Raffa, that's a good way to make a 87-89 R cylinder run without re-sleeving. Even If It Is a Yamaha part In there

[oldsking86]

Looks sick Billy, geesh if I bring my R I won't stand a chance I'm all stock for now but mods are in plan for the new year

[Pete]

How bout an oval at TF07. There would be a bunch of people willing to give It a whirl don't Ya think. It would be some Intense racing & I bet the owner's of Haspin would make It happen for us with a little beggin.

Raffa, that's a good way to make a 87-89 R cylinder run without re-sleeving. Even If It Is a Yamaha part In there

the 84 R pistons can be used as well with a small bevel on one of the transfers

[HondaHarry]

looking good billy. youre not messing around are you? LOL HH