2001 summit 800 help

[overkill131313]

I have been out of ski-doos since 98 and we never had the 800 twins back then. A friend just got one with 2500 km on it but it is a hard starter. like 5-7 pulls to start it when it is hot. going to change plugs and check compression. what should compression be? what else can be done for a "tune up"? how is life on these engines? I know rotax is a great engine but did the 800 have any problems. the primary clutch is making some noise at low rpm (rattle)??? any info whould be great because he will be gone in 4 days and would like to help him with it.

 

[boondockin]

I have been out of ski-doos since 98 and we never had the 800 twins back then. A friend just got one with 2500 km on it but it is a hard starter. like 5-7 pulls to start it when it is hot. going to change plugs and check compression. what should compression be? what else can be done for a "tune up"? how is life on these engines? I know rotax is a great engine but did the 800 have any problems. the primary clutch is making some noise at low rpm (rattle)??? any info whould be great because he will be gone in 4 days and would like to help him with it.

i just got the 01 to, for compression on mine i got 120 if i remember right, i dont know if this is a problem but its something i'd look at is the boots between the carb and the reeds check for holes or delamination, this happened to mine and made it run like crap (i'm hoping) i've got the new pieces ordered along with some c force 3's, im having the same rattling at low rpm to, i have a SHR clutch kit sittin ready to be installed so i'm hoping once i get the clutch pulled of i can find the rattle, i'd check the rave valves and make sure that they arent gummed up and grease the skid...post when i get new parts on

 

[Modman]

I have been out of ski-doos since 98 and we never had the 800 twins back then. A friend just got one with 2500 km on it but it is a hard starter. like 5-7 pulls to start it when it is hot. going to change plugs and check compression. what should compression be? what else can be done for a "tune up"? how is life on these engines? I know rotax is a great engine but did the 800 have any problems. the primary clutch is making some noise at low rpm (rattle)??? any info whould be great because he will be gone in 4 days and would like to help him with it.

Do compression check with the engine hot and with kill switch off and holding throttle wide open, cylinders should be within 10% of one another. Use a good gauge, double check with a second gauge if possible. 120 is a little low IMO, but could just be the gauge as well, 130-140 would be a little better.

Hard starting when hot is commonly a sign that a motor needs rings. If your carb heaters are on though, the hot carbs will evaporate the fuel a little and it will take a few pulls to get it started. Check to see if the valve for the carb heaters is on as well (not sure if this sled has them?).

 

[teeroy]

check the reeds if you're taking the carbs off, they are known to chip and crack on these models after a few years. hard starting is definitely a symptom, poor atomization of fuel entering the cylinders.

 

[Slamnek]

Put new pistons and rings in her. The 800 doo's had bad rings from 2000 to 2005 and the reed boots are prone to delaminating. When that happens KAAABOOOOM...and yer walkin home.

 

[Pappillion]

I havn't seen a primary that didn't rattle a bit yet. as long as there isn't much play in it you should be fine.

 

[boondockin]

the reed boots are prone to delaminating. When that happens KAAABOOOOM...and yer walkin home.

that happened to me but luckily i caught it before KAAABOOOOM would the delamination cause backfiring when starting the sled cold?!?

 

[teeroy]

that happened to me but luckily i caught it before KAAABOOOOM would the delamination cause backfiring when starting the sled cold?!?

the delamination won't cause the kaboom, at worst it will foul plugs and not start well. I think he's referring to the bad rings. the '01 800 engines were subject to a recall, they replaced pistons/rings as well as the coolant reservoir. mine had 4300 kms on it without a hiccup, but the reeds and reed cages had to be replaced on year 4.

 

[Slamnek]

If the reed boots delaminate and allow air to be sucked in, will it not lean out and cause a melt down?

 

[OVERKILL 19]

My 01 800X did the same thing as soon as it was hot and you shut it down it was a real bugger to get going again. The reeds were warped IMO from Mohawk fuel but that is another topic. Changed them out never looked back. On a side note, I have a set of stock reeds with boots from a 06X rev if anyone needs a set the have about 400k on them changed out to V-force.

 

[teeroy]

If the reed boots delaminate and allow air to be sucked in, will it not lean out and cause a melt down?

if the boots are cracked and letting in air, then yes. the "delamination" I'm talking about is the coating of rubber on top of the metal reed cages peeling off, it is inside the intake tract and won't cause air to leak in. the reeds then do not "seat" on the rubber, but above the metal cage leaving up to an 1/8th inch gap between the petals and cage. the fuel does not proprely atomize because of the reeds not completely touching the cage suface, allowing large drops of fuel into the cylinder, causing poor starting and sometimes fouled plugs.

 

[rsaint]

I have been out of ski-doos since 98 and we never had the 800 twins back then. A friend just got one with 2500 km on it but it is a hard starter. like 5-7 pulls to start it when it is hot. going to change plugs and check compression. what should compression be? what else can be done for a "tune up"? how is life on these engines? I know rotax is a great engine but did the 800 have any problems. the primary clutch is making some noise at low rpm (rattle)??? any info whould be great because he will be gone in 4 days and would like to help him with it.

Had that year of 800 check if the update on the top end was done and they are not a good starting machine . Try to crack the throttle just a bit when it is warm and it will start on the second pull, know this because it was the wifes machine put electric start on it and she was fine. Some were putting smaller pilot jets in them for easier starting. That year on some of them the pto side of the cranks were bad. That happend off warrenty to me but BRP supplied short block to me but not labor still good of them.

 

[mxz sledhead]

I have been out of ski-doos since 98 and we never had the 800 twins back then. A friend just got one with 2500 km on it but it is a hard starter. like 5-7 pulls to start it when it is hot. going to change plugs and check compression. what should compression be? what else can be done for a "tune up"? how is life on these engines? I know rotax is a great engine but did the 800 have any problems. the primary clutch is making some noise at low rpm (rattle)??? any info whould be great because he will be gone in 4 days and would like to help him with it.

I own 800 mxz clutch sounds alittle noisey normal run92 octain br9es plugs
hold the throtte just in little bit very strong engine I have just short 5000 km
and no problems in flatlands or at 9500ft

 

[overkill131313]

thanks for all the input. it is the boots. both gone. new ones on order. compression is 140 but when I closed the hood the idle went down so i guted out the foam and the idle still went down. when I pushed on the air box idle went down. that is when I started pushing on the carbs and noticed the change of RPM. tore it down and both boots had big rips in them. I cant believe it ran or didnt lean out and blow up... once again thanks for all the input.

 

[timbo]

go with v-force 3's way better and cheaper than doo.

 

[overkill131313]

they are a stock replacement no changing anything part? do these on rip like the doo ones?

 

[timbo]

just bolt them on only had to open holes for boost bottle ,really helped mid range on mine.

 

[overkill131313]

I see your from edmonton. my friend is from fort sask. where can he find these up there. any skidoo shop???

 

[timbo]

got mine from royal dist,prob cheaper than a doo shop.tell him to pm me if any questions.

 

[mxz sledhead]

I have 01 800 mxz just clean and service toliet bowl carb BRP alway send
there sleds with fat jets 500 drop them down to 480 it starts better and
runs cleaner