Messages

1

Carburetor, Intake, and Exhaust / Re: Runs like choked all the time

« on: November 27, 2021, 06:15:41 AM »

You can zoom in,  that crack runs to the top.  I do not see the crack on the inside but based on how it's leaking,  pretty sure there is a crack behind the crank.

Joe,  I saw that,  but they are like 2/3 the cost of a fresh built complete motor.  Unless you are talking about a different product?

2

Carburetor, Intake, and Exhaust / Re: Runs like choked all the time

« on: November 27, 2021, 06:13:46 AM »

You can zoom in,  that crack runs to the top.  I do not see the crack on the inside but based on how it's leaking,  pretty sure there is a crack behind the crank.

3

Carburetor, Intake, and Exhaust / Re: Runs like choked all the time

« on: November 26, 2021, 03:39:51 PM »

Hey folks,  I haven't touched my R in a year due to life changes.

But I got a leak down tested,  Found it was leaking from the rear cylinder base bolt threads on the left side.  Leaking as fast as I can put air in. I got it in the sunlight and found a crack that runs along the cylinder bolt.  I am assuming it is cracked in the inside too.

Question is,  can this be repaired with welding?  Worried about crank clearance.  You guys know as well as me left cases are hard to find so looking for other options.

I do have a pic of the crack but can't remember the hosting service I used.

4

Carburetor, Intake, and Exhaust / Re: Runs like choked all the time

« on: August 28, 2020, 09:02:05 PM »

Well,  I'm making 185-190psi on this new top end.  Waiting on the new cdi now.  Hopefully that fixes it.

Otherwise can I use a cr cdi with the trx flywheel and stator?

5

Carburetor, Intake, and Exhaust / Re: Runs like choked all the time

« on: August 24, 2020, 01:09:26 PM »

Pistons typically go by .010" bore sizes. .010" = 0.25mm. so it is a 67.75mm piston

  Measure the bore.  If the piston measures 67.75 it is probably a worn out 68.0 mm piston. The piston's largest diameter is usually the bore size minus the piston to cylinder wall clearance.  If the bore size is 67.75 the piston's largest diameter should be around 67.65 to 67.70mm

Thanks Jerry.  The part# verified it's 68mm. I did measure the bore.... on my calipers it was coming up 67.85-67.9.

I then measured a brand new 66mm piston at 65.75.

My calipers just seem to be .25mm off at the bigger measurements despite being zeroized.

6

Carburetor, Intake, and Exhaust / Re: Runs like choked all the time

« on: August 24, 2020, 11:15:27 AM »

They might have phased out the .010" bore sizes. You can still find rings for the 67.75, but it doesn't look like piston kits are available

That piston is garbage. Top ring broke and overlapped in the same ring groove. Also looks like the top of the piston was starting to melt.

Thanks 2ndmoto.i wasted your time,  apologies.  I cleaned the top of the piston and found the part #. It's a 68mm wiesco.

Maybe I should have paid more than $50 for digital calipers?

7

Carburetor, Intake, and Exhaust / Re: Runs like choked all the time

« on: August 24, 2020, 08:32:27 AM »

Update,  I cannot find a 67.75mm piston.  Prox and wiesco do not make them.

Is this a "some' year cr piston?

8

Carburetor, Intake, and Exhaust / Re: Runs like choked all the time

« on: August 24, 2020, 08:01:26 AM »

I have been out of there suspension side of things for a while. Norm had a guy do a rebuild for him recently. I have not heard the race report on it. Check out Derisi Racing. I dealt with Santo many years ago and he was a stand up guy

Right,  I totally forgot about Santo.

And thanks on the piston.  I did a quick search and couldn't find one.  I'll be more dedicated now that I know what I need.

9

Carburetor, Intake, and Exhaust / Re: Runs like choked all the time

« on: August 23, 2020, 06:16:19 PM »

Also,  on another note... and probably wrong section but I already got this one going.

I'm want to replace the piston,  my calipers are telling me 67.75mm ish. Is this a 68mm?


And also,  just noticed my rear shock bumper dry rotted, is there some you recommend for rebuild? I haven't had shocks built/ rebuilt since Laz passed away,  looking for someone as reputable.

10

Carburetor, Intake, and Exhaust / Re: Runs like choked all the time

« on: August 23, 2020, 05:40:19 PM »

Nice to find old parts. Sounds like you have a good stash.

You are narrowing down possible issues. Seems like it is pointing towards ignition

I think so,  I just popped the flywheel like Jerry said to make sure the key wasn't broken or I didn't goon-up when I installed it.  Everything was fine.

CDI is the only thing left that I can think of.

11

Carburetor, Intake, and Exhaust / Re: Runs like choked all the time

« on: August 22, 2020, 05:33:45 PM »

I stripped the cylinder off it today,  no oil in the base.  Just anti freeze (cylinder still had some in it after i drained) and a little gas mix, just enough to smell.

I think the base is sealed good. 

I did have a little gas mix on the gakets to the intake and base gasket.... not sure if that's normal.... i think maybe running this rich?

I found 2 more cylinders for it though while I was rummaging through parts... i found a heavily ported and bored pro works 88 cylinder and a what I think could be an untouched 85 cylinder with original paint,  sleeve,  no porting and the original inspectors mark in the intake. Pretty excited about that later one.

Also found a stache of old race parts i had,  asv levers, quick release tank fittings, sparks full exhausts, lots of other stuff and a complete sparks 485r (450r bored) motor. That motor has one of John Natalie's sparks heads on it from his championship 2005 year.  I forgot I had it and it ended up being too much to race with.

Sorry about all that... got excited I found so many memories.

12

Carburetor, Intake, and Exhaust / Re: Runs like choked all the time

« on: August 22, 2020, 05:06:37 PM »

I'm sure someone on this site can ship you a known working OEM CDI so you can test that.

That would be awesome.... willing to pay all shipping and rent. 

13

Engine and Bottom End / Re: what headlight options do i have

« on: August 16, 2020, 02:53:24 PM »

Hey 250r brother. 

I've already done what you're asking from the standard stator/ ac regulator. I put a 6" led light bar i ebayed and a led tail light i ebayed. They work fine. I bought some metal stock cheap from lowe's to fashion mounts.  I don't run any switches because I don't have room on the handle bars so it's wired to be on all the time.  I also don't have brake switches so I wired the tail light to always illuminate as if the brakes are on (bright).

With the shop manual,  it should be really easy for you and your pops to replicate the oem worrying harness,  it's pretty simple. If you don't have the time or want (like me)  there is a guy who sells oem replicated harnesses on eBay for $100.

I can give you links to what I bought if your interested.

14

Carburetor, Intake, and Exhaust / Re: Runs like choked all the time

« on: August 16, 2020, 09:01:48 AM »

p.s. Jerry,

You described what I'm seeing on both cdi boxes including the oem box which I think is sparking real late, there is a lot of kick back on it.  It's almost as a capacitor (or something) is going bad and not passing the signal right away to the coil. I'm assuming your comments on oem boxes are older boxes that have gone bad? If so,  that's my case.

Any recommendation here for cdi boxes?  I only bought the dyna tech because I couldn't find new oem and it was the more expensive option (I wrongly assumed cost = quality).

15

Carburetor, Intake, and Exhaust / Re: Runs like choked all the time

« on: August 16, 2020, 08:10:16 AM »

0 degrees should be fine. Something is up with your cdi, I recall mine pulling spark through the kick. Would be nice if you could get your hands on a known good one.

Let's start checking things off the list. Did you do a leak down test? Grounds are good? Low resistance between points? Check the spark plug cap and coil.

I was out of town this week until Friday and didn't build the tester yet.

I had a no spark issue for a week that ended up being a bent pin in a plug,  because of that everything electrical has been resistance checked and checked good in accordance with the shop man.