340lc and 440 lc restore and rebuild

[red19lite]

the next two picks are of the chaparral gb44w cylinder the exhaust port is smaller but they can be ground out to rupp porting but its a lot of work they run two ring pistons but 76 rupp onringers work in them you can bore them out to 72mm and make a 484cc engine but with no boost port the 484 piston is a two ring and you cant go a wide on the export with it because the second ring is pinned between exhuast and transfer port

[red19lite]

here what the intake looks like on the chaparral clyinder the intake port is 21mm from bottom of clyinder like rupp, transfer are at 49mm, exhaust is at 32mm these were 50hp at 7300 rpms, they still could be moded to make good hp

[red19lite]

here a picture of 76 rupp cylinder head vs chaparral head the rupp head is higher compression the chap head has a more open chamber less compression but it could be milled down reshaped for more compression, theres alot out there on the table with these xenoah engine there are combinations to make well over 125hp moded only thing lacking is your imagination and pocket book dam that usally hurts

[klong]

aint that the truth! you do some really impressive work. very nice stuff. keep it coming!!!

[red19lite]

got the 76 nitro out today and put a couple hrs of easy time on it with the engine a rebuilt in the thread basically a 1976 440 motor with 77 jugs, got the 102 c and the jetting worked out a little bit today , im running a1 polaris clutch arms about 44 grams and a blue polaris spring thats130 lbs at a height of 2 3/8 inches my shift rpm is about 8500 rpms she feels real good , i need to put another click in the driven unit yet , here a picture of my daughter on it today, shes seventeen a never rode on a snowmobile before but she been on fourwheelers and tractors she said it wasnt what she expected that it takes off so quick, shes caught me looking at chic,s on sleds before , so she ,s my chic on sleds now we really had a laugh at this shes a shy one .

[klong]

What combo do you think will get you to 125 hp?

[red19lite]

another ones alive now, about 30 hrs of none stop thrasing, the 77 nitro 440 is up and running . i did a lot of the engine work earlier its a 76 engine with 77-78 clyinders,

[red19lite]

heres the 77 and 76 now both are riders , they have same engine combination and 102c clutching , the 77 has stock rupp suspension with cleated polaris track i bought it that way , the 77 has way to much streering effort have to check the wedges to see if i can loosen it up some it really feels like its 2 inches above the snow compared to the 76 with arctic cat track and suspension,

[red19lite]

relocated the pc board on the 76 and the expansion tank and cdi unit, the pc board was relocated to the chain case like the 77 i took about 20 ft of wires out of the leads going to the pc board and put all new connectors in them you can get new connector for them at radio shack, boy this cleaned alot of mess under the dash and below air box, bolted the cdi unit to water pump cover and its lot easy to get to now, the expansion tank i mentioned earlier has been relocated to water pump cover also i used a conduit pipe clamp for electrical conduit to hold the bottle worked out slick, now you can get to alot of things under the hood more easly

[red19lite]

did the same relocations for cdi unit and expansion tank on 77 nitro

[red19lite]

here how to check stator on xenoah liquid cooled first test pulser coil hook ohm meter between blue and red white wire should be 21.6 ohms + or- 10%

[red19lite]

here the excitor coil checkbetween brown and red white wire should be278 ohms +or- 10%

[red19lite]

to check the lighting coil measure ohms between yellow and white wires at the main connector should be.184 ohms+ or- 10% thats all there is to checking the stator. if you check dont check out check out all wire connections corruded conectors will raise resientance clean and replace connections rechek values then. if all this fails replace stator

[red19lite]

heres a set of 77 440 cylinders i had laying around with std. bore but the head studs had been drilled and tapped 3/8-16 and were stripped out, put 12 big serts in them and saved the clyinders and now there back to 8x1.25 mm like stock ,, the big sert repair is great i recommend it for those big oops on thread repair the holes were just to far oversize for helicoils, so if your got a jug thats all messed up this will give you another shot at it

[red19lite]

here another shot of the bigserts and were to get them

[RevitupRUPP]

Feb 6, 2010 18:45:19 GMT -6 red19lite said:

got the 76 nitro out today and put a couple hrs of easy time on it with the engine a rebuilt in the thread basically a 1976 440 motor with 77 jugs, got the 102 c and the jetting worked out a little bit today , im running a-3 polaris clutch arms about 44 grams and a blue polaris spring thats130 lbs at a height of 2 3/8 inches my shift rpm is about 8500 rpms she feels real good , i need to put another click in the driven unit yet , here a picture of my daughter on it today, shes seventeen a never rode on a snowmobile before but she been on fourwheelers and tractors she said it wasnt what she expected that it takes off so quick, shes caught me looking at chic,s on sleds before , so she ,s my chic on sleds now we really had a laugh at this shes a shy one .

Hmmm very cool!

[red19lite]

heres a littl mod stuff heres a set of clyinders with wire locks [o-rings] installed, the clyinder head will have receiver rings installed and will use .042 thick copper head gaskets

[red19lite]

this is a 77 head being cut for receiver grooves

[red19lite]

here a picture of me about 1978 with bar built from peices with 280 r hirth 650 dual ignition helicopter engine in it, i drag raced it back then and did very well with it it put a lot of srx,s and 9500 ski doos and kaw and polaris back on the trailer on the the lake back then had texas chassie and suspension, four band kalamazoo track and 44 mm mikunis ,comet clutching

[red19lite]

here a under the hood shot the pipes were earhardt looper pipes from tom earhardt the speedway king from michigan they were oringnaly fitted to a chaparral with a 280 r in it, i have some picture of my 72 ifs chaparral with 77 440 nitro liquid in it some where i will post them when i find them,the earhardt pipes and rupp liquid pipes looked a lot a like latter kevin