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1983 CR 250 Build Thread

A place to relive, revive, and ride that "old iron".

Post Wed Sep 23, 2020 7:59 pm

Posts: 1284
Location: Amherst, NH
Looking forward to banging bars with you too Tom ! Hoping to get some seat time in tomorrow - I’ll be pleased if I can just finish the race.

450exc115 wrote:
Bike looks great Steve. Looking forward to banging bars with you :)
Steve

MVTR

Post Wed Sep 23, 2020 8:04 pm

Posts: 1284
Location: Amherst, NH
Perfect - Thank you Nate !

sgthubbard60 wrote:
sjsst41 wrote:
Well I like that ! Thank you Darrell.

I’ll have to swap it onto the CR, it’ll probably gain some dBa, but it’ll look very cool.

I wonder if I can get that graphic made that’ll handle the heat.


Here you go Steve. It’ll hold up just fine to the heat.
https://www.fastguystuff.com/Roost-Fact ... g-283a.htm
Steve

MVTR

Post Wed Sep 23, 2020 8:42 pm

Posts: 257
Bike looks great Steve. Looking forward to seeing it Saturday!

Post Thu Sep 24, 2020 3:08 pm

Posts: 1284
Location: Amherst, NH
Thank you - Definitely Looking forward to it !

ratsMC wrote:
Bike looks great Steve. Looking forward to seeing it Saturday!
Steve

MVTR

Post Thu Sep 24, 2020 4:53 pm

Posts: 1284
Location: Amherst, NH
Took the old CR for a spin today around the house today, damn it does rip. Maybe 10 minutes on the bike, almost ran too good (like it was running lean) so I pulled the plug. Thoughts? I think it looks maybe running a little rich?
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Steve

MVTR

Post Thu Sep 24, 2020 4:57 pm

Posts: 1284
Location: Amherst, NH
Also the head pipe was seeing some heat & turning “blue” - I can’t tell if this could be considered normal? Again was thinking lean, I’ll let you know I’ve done nothing with the carb - it’s as I got it from the heap of parts that came with the carcass.
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Steve

MVTR

Post Thu Sep 24, 2020 7:59 pm

Posts: 879
Both plug and pipe look normal to me. You may have some leanness going on somewhere in the throttle range, but it doesn't look like it's across the board. Maybe raise the needle one notch if you're nervous and see if it still runs good.
Valves are STILL for toilets!

Post Thu Sep 24, 2020 9:56 pm

Posts: 1284
Location: Amherst, NH
Thanks Todd - I’ll work that for piece of mind.
Steve

MVTR

Post Fri Sep 25, 2020 9:09 am

Posts: 1396
They look fine to me Steve. Run it!

Post Fri Sep 25, 2020 4:48 pm

Posts: 1284
Location: Amherst, NH
Thanks Nate - at this point that’s the plan - looking forward to seeing the crew tomorrow !

sgthubbard60 wrote:
They look fine to me Steve. Run it!
Steve

MVTR

Post Wed Sep 30, 2020 7:46 pm

Posts: 1284
Location: Amherst, NH
Post race photo
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Steve

MVTR

Post Wed Sep 30, 2020 8:25 pm

Posts: 926
sjsst41 wrote:
Post race photo


Did that flatten the powerband a bit?! :omg:

Post Thu Oct 01, 2020 11:46 am

Posts: 1209
It still looks cleaner than my one lap wonder...
Tom A.
SRCR President
Vintage Series Racer
1977 MX3, 1977 RM 175, 1980 CR250R, 1981 PE250, 1988 Cagiva WMX, 90 CRM250, 98 YZ250

Post Thu Oct 01, 2020 12:07 pm

Posts: 1284
Location: Amherst, NH
Lol - just a bit.

oldschool wrote:
sjsst41 wrote:
Post race photo


Did that flatten the powerband a bit?! :omg:
Steve

MVTR

Post Thu Oct 01, 2020 12:08 pm

Posts: 1284
Location: Amherst, NH
Think you’ll have it sorted out by HK, or will you be on the YZ?

450exc115 wrote:
It still looks cleaner than my one lap wonder...
Steve

MVTR

Post Thu Oct 01, 2020 12:09 pm

Posts: 1284
Location: Amherst, NH
oldschool wrote:
sjsst41 wrote:
Post race photo


Did that flatten the powerband a bit?! :omg:


This much:
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Steve

MVTR

Post Thu Oct 01, 2020 2:08 pm

Posts: 1209
sjsst41 wrote:
Think you’ll have it sorted out by HK, or will you be on the YZ?

450exc115 wrote:
It still looks cleaner than my one lap wonder...


Hopefully. Ordered a HPI setup but I haven't had much luck getting confirmation that it shipped or when it might.

The stator coil bolts let go so the ground wasn't great and took out the CDI. I have a second stator coming and a universal CDI/coil setup that I can run in a pinch but I'd really like to get the HPI unit installed and tested. It's a fully digital ignition with lighter rotor.

Worse case I'll run the YZ465.
Tom A.
SRCR President
Vintage Series Racer
1977 MX3, 1977 RM 175, 1980 CR250R, 1981 PE250, 1988 Cagiva WMX, 90 CRM250, 98 YZ250

Post Thu Oct 01, 2020 4:48 pm

Posts: 257
sjsst41 wrote:
oldschool wrote:
sjsst41 wrote:
Post race photo


Did that flatten the powerband a bit?! :omg:


This much:


Damn! When I said leave the low pipes at home I guess that meant bring a 4 stroke :shock

Never seen one that flattened. Though I heard Nate smashed his YZ pretty bad on Sunday.

Post Fri Oct 02, 2020 9:01 am

Posts: 879
Steve, as I mentioned in a txt, the PFR pipes are rumored to be better performance and better fitting than the DG's. I've had one on order for 3 weeks so far....(ebay seller "jesusislordandgod") apparently you order and then they build. He is a good seller, but I've heard that PFR is slow on the build.
Tom, those HPI ignitions are awesome. Depending on which model you get, you can download an app to your laptop and program the ignition advance curve from pre programmed or make your own. I almost went with HPI for my '79 YZ125, but bolted on a 2001 YZ250 ignition instead.
Valves are STILL for toilets!

Post Sat Oct 03, 2020 9:39 am

Posts: 1284
Location: Amherst, NH
So I’ll let you know how the PFR pipe fits. I ordered it a week ago, I believe it was in stock at VMX & I have my fingers crossed it arrives next week.

The pipe that was crushed was a DG pipe - it came with the bike that I got off Tom E, but I’m not sure it was ever installed on it, and it did require some “denting” to clearance some features.

I also realized the parts bike I picked up has a stock expansion chamber - but it’s rough shape, but I think I could fit it on there in a pinch to make the next/last race if the PFR doesn’t arrive in time.

T-Dub13 wrote:
Steve, as I mentioned in a txt, the PFR pipes are rumored to be better performance and better fitting than the DG's. I've had one on order for 3 weeks so far....(ebay seller "jesusislordandgod") apparently you order and then they build. He is a good seller, but I've heard that PFR is slow on the build.
Tom, those HPI ignitions are awesome. Depending on which model you get, you can download an app to your laptop and program the ignition advance curve from pre programmed or make your own. I almost went with HPI for my '79 YZ125, but bolted on a 2001 YZ250 ignition instead.
Steve

MVTR

Post Sat Oct 03, 2020 12:30 pm

Posts: 1284
Location: Amherst, NH
New pipe arrived today :)
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Steve

MVTR

Post Sat Oct 03, 2020 1:50 pm

Posts: 1284
Location: Amherst, NH
Interference issues - but knew that with the aftermarket radiators & the ‘81 clutch cover
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Steve

MVTR

Post Mon Oct 19, 2020 5:57 pm

Posts: 1284
Location: Amherst, NH
Well the 38mm PWK Airstriker is on order :biggrin

Hopefully that gets me further along getting this bike sorted out.

Pic from the race courtesy Libby :)
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Steve

MVTR

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