Mikee
Newbie
- Joined
- Nov 18, 2015
- Messages
- 5
- Age
- 57
- Location
- Finland
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- Other
- Snowmobile
- Yamaha Nytro xtx mpi charged 220
Hey guys!
I'd need a little help. I have a Yamaha Nytro XTX 220hp MPI charged, year 2012.
The problem started when I updated from a 180hp kit to a 220hp kit. When the engine has run for about 2 minutes and I give it throttle so it goes over 4500 rpm and then release, the engine stays at 4200 rpm until I choke ISC-valve hose from pressure box.
Next thing I did was that I removed the ISC-valve hose from pressure box (inside diameter 12mm), choked it to 6mm and then placed a filter at the end of the hose. By doing this, the engine runs OK at mid-and high revs but idle rpm is only 1250-1300. Idle mixture is too lean and the engine don't run properly at idle.
Air/fuel ratio is 15-16 (recommendation is 13,8 to 14,5).
Any ideas how to fix this??
Another question is about the ISC-valve hose. When looking at the MPI installation picture you can see hose placed under the throttle body. In my charged kit the outlet for it is in the pressure-box. What is the correct place for it?
Thanks in advance!
// Mike from Finland
I'd need a little help. I have a Yamaha Nytro XTX 220hp MPI charged, year 2012.
The problem started when I updated from a 180hp kit to a 220hp kit. When the engine has run for about 2 minutes and I give it throttle so it goes over 4500 rpm and then release, the engine stays at 4200 rpm until I choke ISC-valve hose from pressure box.
Next thing I did was that I removed the ISC-valve hose from pressure box (inside diameter 12mm), choked it to 6mm and then placed a filter at the end of the hose. By doing this, the engine runs OK at mid-and high revs but idle rpm is only 1250-1300. Idle mixture is too lean and the engine don't run properly at idle.
Air/fuel ratio is 15-16 (recommendation is 13,8 to 14,5).
Any ideas how to fix this??
Another question is about the ISC-valve hose. When looking at the MPI installation picture you can see hose placed under the throttle body. In my charged kit the outlet for it is in the pressure-box. What is the correct place for it?
Thanks in advance!
// Mike from Finland
Attachments
herndonp
TY 4 Stroke Guru
Mike,
email MPI I'm sure they can help you figure this out it would be to expensive for you to call tech support so let them know in the email you live in Finland. Sales@MountainPerformance.com
email MPI I'm sure they can help you figure this out it would be to expensive for you to call tech support so let them know in the email you live in Finland. Sales@MountainPerformance.com
Last edited:
Mikee
Newbie
- Joined
- Nov 18, 2015
- Messages
- 5
- Age
- 57
- Location
- Finland
- Country
- Other
- Snowmobile
- Yamaha Nytro xtx mpi charged 220
Hi herndonp!
I have, together with the Yamaha parts dealer in Finland (who sold the MPI-kit to me), e-mailed them a several times (Mac Randolph) but I haven't got any answers!
So I try to get some help here. I have spend a lot of time last winter and this autum to find the problem.
I have, together with the Yamaha parts dealer in Finland (who sold the MPI-kit to me), e-mailed them a several times (Mac Randolph) but I haven't got any answers!
So I try to get some help here. I have spend a lot of time last winter and this autum to find the problem.
herndonp
TY 4 Stroke Guru
Mike that sucks. I would have thought your dealer or MPI would have helped you. I see you posted in the Turbo forum maybe someone will have an answer for you there.
Pete
Pete
fxnytrortxkid
TY 4 Stroke God
- Joined
- Apr 19, 2007
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- Rensselaer, ny
- Country
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- Snowmobile
- 09 nytro rtx
Does the isc actually function in diag mode on the gauge? Are you getting check engine code 37? If so I got same deal, I changed valve out to no avail, believe it's wireing on my end.
